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Öğe Effect of Different Types of Adhesive Agents on Orthodontic Bracket Shear Bond Strength: A Cyclic Loading Study(Mdpi, 2023) Eser, Irfan; Çiçek, Orhan; Özkalaycı, Nurhat; Yetmez, Mehmet; Erener, HandeBracket failure is one of the most important problems encountered during fixed orthodontic treatment. For this reason, different types of adhesive agents have been developed over the years. Consequently, the aim of this study was to evaluate the shear bond strength of brackets bonded to teeth etched with a conventional acid etching method in a laboratory environment by using different types of adhesive agents and comparing the number of shear strokes. Sixty human maxillary premolars were divided into three groups and Gemini stainless steel metal brackets (3M Unitek, Monrovia, CA, USA) were bonded to all teeth. In Group 1, Transbond (TM) XT Primer (3M Unitek, Monrovia, CA, USA) and Transbond (TM) XT Light Cure Adhesive Paste composite (3M Unitek, Monrovia, CA, USA) were used. In Group 2, BracePaste((R)) MTP Primer (American Orthodontics, Sheboygan, CA, USA) and BracePaste((R)) Adhesive composite (American Orthodontics, Sheboygan, WI, USA) were used. In Group 3, Ortho Solo (TM) Primer (Ormco, Orange, CA, USA) and Grengloo (TM) Adhesive composite (Ormco, Brea, CA, USA) were used. The samples were subjected to a shear test with a closed-loop controlled, low-cycle fatigue machine with a capacity of 10 N and a crosshead speed of 300 mm/min. The number of shear strokes of the brackets was recorded. According to the Kruskal-Wallis and Mann-Whitney U tests performed on the data obtained, statistically significant differences were found between the groups in terms of the numbers of shear strokes (p < 0.05). Significantly higher numbers of shear strokes and higher shear bond strengths were observed in Group 3 compared with Group 1 and Group 2 (p < 0.05). There was no statistically significant difference between the numbers of shear strokes for Group 1 and Group 2 samples (p > 0.05). To conclude the study, it was observed that the type of adhesive used had an effect on the bond strength of the bracket and that the Grengloo (TM) adhesive agent showed higher shear bond strength. It was observed that BracePaste((R)) Adhesive and Transbond (TM) XT Light Cure Adhesive Paste adhesive agents had similar shear bond strengths.Öğe Evaluation of the Demineralization Development around Different Types of Orthodontic Brackets(Mdpi, 2023) Ertop, Melis Toz; Çiçek, Orhan; Erener, Hande; Özkalaycı, Nurhat; Çiçek, Büşra Demir; Cömert, FüsünThe aim of this study was to compare the demineralizations of the enamel surfaces around different types of orthodontic brackets in an artificial cariogenic environment. A total of 90 extracted human maxillary first premolar teeth were used in this in vitro study. The teeth were divided into 6 groups, 5 study and 1 control, each consisting of 15 samples. Victory metal, Gemini metal, Clarity self-ligating ceramic, APC Clarity Advanced ceramic and Clarity Advanced ceramic brackets (3M Unitek, Monrovia, Calif) used in the study groups were bonded to the teeth with the direct technique. The gingival, occlusal and proximal enamel surfaces adjacent to the brackets were measured with a DIAGNOdent pen (KaVo, Biberach, Germany) (T0). Then, the teeth were placed in a cariogenic suspension environment containing Streptococcus mutans, sucrose and artificial saliva. The teeth were removed from the cariogenic suspension at the end of 28 days. Enamel surfaces were remeasured with DIAGNOdent and the values were recorded (T1). Whether the obtained data were homogeneously distributed or not was determined by the Kolmogorov-Smirnov test, within-group comparisons were performed with the Wilcoxon test, and between-group comparisons were performed with Mann-Whitney U and Kruskal-Wallis tests. Significance level was accepted as p < 0.05. In all groups, the demineralization values of the enamel surfaces in the gingival, proximal and occlusal surfaces adjacent to the brackets were significantly higher in the T1 period than in the T0 period (p < 0.05). In the T1 period of Gemini metal, Clarity self-ligating ceramic and Clarity advanced ceramic bracket groups, the demineralization values of the proximal enamel surfaces were found to be significantly higher than the Victory metal and APC Clarity Advanced ceramic bracket groups (p < 0.05). In the T1 period, the demineralization values of the occlusal enamel surfaces of the Victory metal, APC Clarity Advanced ceramic bracket groups and control group were significantly lower than the Gemini metal, Clarity self-ligating ceramic and Clarity Advanced ceramic bracket groups (p < 0.05). Significant increases in enamel demineralization values were observed as a consequence of increased retention areas for microbial dental plaque on enamel surfaces adjacent to the bracket. Considering the importance of minimizing enamel demineralization in fixed orthodontic treatments, less enamel demineralization in Victory metal and APC Clarity Advanced ceramic bracket groups showed that these brackets can be preferred in patients with poor oral hygiene.Öğe Evaluation of the Corrosion Resistance of Different Types of Orthodontic Fixed Retention Appliances: A Preliminary Laboratory Study(Mdpi, 2023) Kumrular, Buşra; Çiçek, Orhan; Dağ, İlker Emin; Avar, Barış; Erener, Hande(i) Objective: The present study aimed to compare the electrochemical corrosion resistance of six different types of fixed lingual retainer wires used as fixed retention appliances in an in vitro study. (ii) Methods: In the study, two different Ringer solutions, with pH 7 and pH 3.5, were used. Six groups were formed with five retainer wires in each group. In addition, 3-braided stainless steel, 6-braided stainless steel, Titanium Grade 1, Titanium Grade 5, Gold, and Dead Soft retainer wires were used. The corrosion current density (i(corr)), corrosion rate (CR), and polarization resistance (R-p) were determined from the Tafel polarization curves. (iii) Results: The corrosion current density of the Gold retainer group was statistically higher than the other retainer groups in both solutions (p < 0.05). The corrosion rate of the Dead Soft retainer group was statistically higher than the other retainer groups in both solutions (p < 0.05). The polarization resistance of the Titanium Grade 5 retainer group was statistically higher than the other retainer groups in both solutions (p < 0.05). As a result of Scanning Electron Microscope (SEM) images, pitting corrosion was not observed in the Titanium Grade 1, Titanium Grade 5 and Gold retainer groups, while pitting corrosion was observed in the other groups. (iv) Conclusion: From a corrosion perspective, although the study needs to be evaluated in vivo, the Titanium Grade 5 retainer group included is in this in vitro study may be more suitable for clinical use due to its high electrochemical corrosion resistance and the lack of pitting corrosion observed in the SEM images.Öğe Investigation of the Relationship between Sagittal Skeletal Nasal Profile Morphology and Malocclusions: A Lateral Cephalometric Film Study(Mdpi, 2023) Ocak, Yunus; Çiçek, Orhan; Özkalaycı, Nurhat; Erener, HandeThe aim of this study was to evaluate the relationship between skeletal sagittal nasal profile morphology and sagittal skeletal malocclusions. Regarding lateral cephalometric films, the study was conducted in a total of 135 individuals without any prior orthodontic treatment (mean age of 17.91 +/- 1.91), including 49 males (mean age 17.91 +/- 1.16) and 86 females (mean age 17.78 +/- 1.91 years). The groups were divided into two groups as male and female according to gender, and three groups as skeletal Class 1, Class 2, and Class 3 according to the Steiner's ANB angle. In addition, skeletal groups were compared within groups by dividing into two groups of male and female. A total of eight parameters, three skeletal sagittal angular (SNA, SNB, and ANB angles), four nasal linear (R-A, N-A, N-ANS, and N-R distances) and one nasal angular (N1-N2/N2-R angle), were measured on each cephalometric film. The arithmetic mean and standard deviation of all measured nasal parameters were calculated. For statistical analysis, independent sample t-test and one-way analysis of variance (One-Way ANOVA) were used for normally distributed data, and Mann Whitney U and Kruskal Wallis tests were used for data that did not show normal distribution. For statistical analysis, p < 0.05 was considered significant. R-A, N-A, and N-ANS linear nasal parameters differed significantly between the male and female groups, which were evaluated regardless of the skeletal groups, with a higher rate in males (p < 0.05). N-R linear nasal parameter showed a statistically significant difference between skeletal malocclusion groups, which were evaluated regardless of gender. N-R distance was found to be significantly longer in skeletal Class 3 individuals than in Class 1 and 2 individuals (p < 0.05). There was no statistically significant difference in nasal bone concavity angle in all groups (p > 0.05). R-A and N-A linear nasal parameters showed statistically significant differences between male and female sex groups in all skeletal malocclusion classes (p < 0.05). At first, results showed that males had longer measurements than females in all linear nasal parameters. Second, longer measurements were found in all linear nasal parameters in skeletal Class 3 individuals than those in skeletal Class 1 and Class 2 individuals. Third, the nasal bone concavity angle was greater in skeletal Class 2 individuals than the others.Öğe Effect of combined boric acid and chlorhexidine mouthwashes on postoperative complications and periodontal healing after impacted third molar surgery: a-double blind randomized study(Springer Science and Business Media Deutschland GmbH, 2023) Erbaşar, G.N.H.; Kaplan, Volkan; Ciğerim, L.; Konarili, F.N.; Şahin, M.Objectives: This study aimed to evaluate the effects of different concentrations of boric acid (BA) combined with chlorhexidine (CHX) mouthwash on postoperative complications and periodontal healing following impacted third molar surgery. Materials and methods: A total of 80 patients were randomly divided into eight groups. The patients in the study groups received different concentrations of BA ranging from 0.1% to 2.5% combined with CHX or 2% BA mouthwash alone. The control group received CHX mouthwash alone. The scores of self-reported pain and jaw dysfunction, trismus, edema, number of analgesics used, and periodontal parameters were compared between the groups. Results: 2.5% BA + CHX group had significantly lower pain and facial swelling values during the follow-up period. 2% BA + CHX group reported significantly lower jaw dysfunction scores on the fourth and fifth postoperative days. The control group showed significantly higher values for pain, jaw dysfunction, and facial swelling than other groups. No significant differences were found between the groups regarding trismus, analgesic use, and periodontal variables. Conclusions: The combination of higher concentrations of BA with CHX was more effective in reducing pain, jaw dysfunction, and swelling following impacted third molar surgery than CHX mouthwash alone. Clinical relevance: The combination of BA and CHX showed better results than the gold standard CHX mouthwash in reducing postoperative complications related to surgical removal of impacted third molars without any adverse effects. This new combination can be an effective alternative to traditional mouthwashes after impacted third molar surgery to ensure oral hygiene. © 2023, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.Öğe Do Different Types of Adhesive Agents Effect Enamel Demineralization for Orthodontic Bonding? An In Vitro Study(Mdpi, 2023) Demircioğlu, Raif Murat; Çiçek, Orhan; Cömert, Fusun; Erener, Hande(1) Objective: The aim of this study was to compare the demineralization around brackets bonded with different types of adhesive agents in a cariogenic suspension environment. (2) Methods: In the study, 60 extracted upper first premolar teeth were divided into three groups with 20 teeth in each group. In Group 1, Transbond XT Primer + Transbond XT Light Cure Adhesive (3M Unitek, Monrovia, CA, USA), in Group 2, GC Ortho Connect Light Cure Adhesive (GC Crop, Tokyo, Japan) and in Group 3, Transbond (TM) Plus Self Etching Primer + Transbond XT Light Cure Adhesive (3M Unitek, Monrovia, CA, USA) adhesive agents were used. In Group 1 and 2, buccal enamel surfaces were etched for 30 s, washed for 15 s and dried for 15 s. All groups were bonded with Gemini metal (3M Unitek, Monrovia, CA, USA) brackets. Gingival, occlusal and proximal enamel surfaces of the brackets were measured with a DIAGNOdent pen (KaVo, Biberach, Germany), and demineralization values were recorded. Measurements were performed after bracketing (T0) and after 28 days in a cariogenic environment (T1), which was renewed every 48 h. The Kolmogorov-Smirnov test was used to determine whether or not the data were homogeneously distributed, the Wilcoxon test was used for comparisons within groups, and the Mann-Whitney U and Kruskal-Wallis tests were used for comparisons between groups. (3) Results: In all groups, demineralization values on all enamel surfaces of the brackets were found to be statistically significantly higher in the T1 period than in the T0 period (p < 0.05). In the T1 period, demineralization values of occlusal enamel surfaces in Groups 1 and 2 were found to be significantly higher than in Group 3 (p < 0.05). The amount of increase in occlusal enamel surface demineralization value between T0 and T1 periods in Groups 1 and 2 was significantly higher than in Group 3 (p < 0.05). There was no statistically significant difference in demineralization values of proximal and gingival enamel surfaces between the groups in the T1 period (p > 0.05). (4) Conclusion: Significantly less occlusal enamel surface demineralization was observed in teeth in which the Transbond (TM) Plus Self Etching Primer adhesive agent was not applied with acid etching.Öğe Oral health-related quality of life of preschool-aged Turkish children with congenital heart disease(Wroclaw Medical Univ, 2022) Yavşan, Zeynep Şeyda; Tosun, Gul; Sert, AhmetBackground. Dental caries and poor oral hygiene can affect the quality of life (QoL) of patients with con -genital heart disease (CHD). Information about the oral health-related quality of life (OHRQoL) of Turkish preschool children with CHD is scarce.Objectives. The aim of the present study was to assess the OHRQoL, and the presence of caries, plaque and gingivitis in Turkish preschool children with CHD as compared to children without CHD (control group).Material and methods. Children aged 3-6 years with CHD (n = 75) and a control group (n = 75) were included in the study. Examinations were conducted using the plaque index (PI), the gingival index (GI) and the World Health Organization (WHO) caries diagnostic criteria. The Early Childhood Oral Health Impact Scale (ECOHIS) questionnaire was completed by the children's families.Results.The amount of caries and plaque, as well as the number of missing teeth were higher in children with CHD. The OHRQoL was lower in children with CHD. However, the differences between the 2 groups were not statistically significant (p > 0.05). The number of filled teeth was significantly higher in the con-trol group (p < 0.05).Conclusions. According to the findings of the present study, the high amount of caries and plaque in both groups demonstrates that caries continues to be a major public health problem. Although there was no significant difference in terms of QoL scale scores between the 2 groups, the study showed that OHRQoL was lower in children with CHD.Öğe Does Saline Irrigation at Different Temperatures Affect Pain, Edema, and Trismus After Impacted Third Molar Surgery: A Clinical Trial(W B Saunders Co-Elsevier Inc, 2023) Çanakçı, F. Gülfesan; Er, Nilay; Duygu, Gonca; Karaca, Gamze TananPurpose: Lower impacted third molar surgery is a very common oral-maxillofacial surgical procedure, which has complications such as facial swelling, pain, and trismus. This clinical trial aimed to compare the intensity of postoperative morbidity (pain, facial swelling, and trismus) following the third molar surgery performed using saline irrigation at different temperatures (4 degrees C, 10 degrees C, or 25 degrees C).Materials and Methods: This double-blind, single-center, split-mouth, randomized prospective clinical trial was conducted among 48 systemically and periodontally healthy patients who had bilaterally asymp-tomatic mandibular third molars. Patients were randomly allocated into 2 groups (n = 24) according to the temperature of the saline used. In each patient, one impacted third molar was determined as the test group (4 degrees C or 10 degrees C saline irrigation) and the other impacted third molar as the control group (25 degrees C saline irri-gation). Trismus and swelling were evaluated on the 1st, 3rd, and 7th days postoperatively. Pain perception by visual analog scale (VAS) and the total number of analgesics taken during the 7 postoperative days were recorded. Data were analyzed using the Shapiro-Wilk test, the chi-square test, one-way analysis of variance, Duncan test, the Kruskal-Wallis test, the Dunn test, and the Friedman test (P < .05).Results: Forty-eight patients (28 females, 20 males) with a mean age of 24.6 +/- 3.8 years were included in the study. The duration of operations was similar. VAS values of test groups [test group 1 (4 degrees C): 4.0, test group 1 (10 degrees C): 8.0] and the number of analgesics taken [test group 1 (4 degrees C): 0, test group 1 (10 degrees) C): 3] were significantly lower (P < .001) than control groups (VAS, control group 1: 13.0, control group 2: 15.5, number of analgesic taken, control group 1: 5.5, control group 2: 4.0). Significant differences were found between the test groups in VAS values and the number of analgesics taken (P < .001). Also, the lowest trismus and facial swelling values were detected in the 4 degrees C test group at all time points (P < .001). Conclusion: In the impacted third molar surgery, the use of cooled saline irrigation during bone removal may be a simple, inexpensive, and effective method for reducing early postoperative complaints. (c) 2022 American Association of Oral and Maxillofacial SurgeonsÖğe The relationship between frontal sinus dimensions and skeletal malocclusion(Istanbul Univ Press, Istanbul Univ Rectorate, 2022) Tunca, Murat; Kaplan, Volkan; Kaya, Yeşim; Tunca, YaseminPurposeThe aim of this retrospective research is to compare frontal sinus dimensions in skeletal Class I, skeletal Class II, and skeletal Class III individuals and to evaluate the relationship of these dimensions with anterior skull base length and some cephalometric values.Materials and MethodsIn this research, we used lateral cephalometric radiographs of 60 people aged 17 to 25. In individuals with skeletal Class I malocclusion, skeletal Class II malocclusion due to mandibular insufficiency, and skeletal Class III malocclusion due to mandibular excess, measurements of frontal sinus length and height as well as S-N, Co-A and Co-Gn lengths, ANB0, FMA0, SN-GoGn0 angles values were performed. The length between the highest point and the lowest point of the frontal sinus was calculated as the height of the frontal sinus, and the length between the most anterior and the most posterior points of the frontal sinus was calculated as the length of the frontal sinus.ResultsThe frontal sinus length and height were found to be higher in skeletal Class III individuals than in skeletal Class I and skeletal Class II individuals, however, there was no significant difference between skeletal Class I and Class II individuals.ConclusionThe increase in frontal sinus height and length correlated positively with the decrease in the ANB angle and the increase in the SN and Co-Gn lengths. The dimensions of the frontal sinus may be an indicator for the remaining mandibular growth potential.Öğe Could Local Application of Hypoxia Inducible Factor 1-alpha Enhancer Deferoxamine Be Promising for Preventing of Medication-Related Osteonecrosis of the Jaw?(Mdpi, 2023) Yalçın-Ülker, Gül Merve; Günbatan, Murat; Duygu, Gonca; Soluk-Tekkesin, Merva; Özçakir-Tomruk, CeydaThis experimental study investigates the prophylactic effect of deferoxamine (DFO) on medication-related osteonecrosis of the jaw (MRONJ). Thirty-six female Sprague Dawley rats received zoledronic acid (ZA) for eight weeks to create an osteonecrosis model. DFO was locally applied into the extraction sockets with gelatin sponge (GS) carriers to prevent MRONJ. The specimens were histopathologically and histomorphometrically evaluated. Hypoxia-inducible factor 1-alpha (HIF-1 alpha) protein levels in the extraction sockets were quantified. New bone formation rate differed significantly between groups (p = 0.005). Newly formed bone ratios in the extraction sockets did not differ significantly between the control group and the GS (p = 1), GS/DFO (p = 0.749), ZA (p = 0.105), ZA-GS (p = 0.474), and ZA-GS/DFO (p = 1) groups. While newly formed bone rates were higher in the ZA-GS and ZA-GS/DFO groups than in the ZA group, the differences were not significant. HIF-1 alpha levels differed significantly between groups (p < 0.001) and were significantly higher in the DFO and ZA-GS/DFO groups than in the control group (p = 0.001 and p = 0.004, respectively). While HIF-1 alpha levels were higher in the ZA-GS/DFO group than in the ZA group, the difference was not significant. While HIF-1 alpha protein levels and new bone formation rate were elevated in the DFO-treated group, the effect was not significant. Further large-scale studies are needed to understand DFO's preventative effects on MRONJ and the role of HIF-1 alpha in MRONJ pathogenesis.Öğe Comparison of Various Measurement Methods in the Evaluation of Swelling After Third Molar Surgery(2021) Kaplan, Volkan; Ciğerim, Levent; Çınarsoy Ciğerim, Saadet; Bazyel, Zeynep Dilan; Dinç, GönülObjective: This study aimed to examine the differences between 12 metric swelling evaluation methods in patients undergoing impacted lower third molar surgery. Material ve Methods: This study was conducted on the patients indicated for the extraction of impacted lower third molar teeth due to orthodontic reasons. Twenty-six patients aged between 18-40 were included in the study. Swelling levels after surgery were measured using anatomic landmarks used for the methods, and the distances between landmarks were measured before the operation, and on days 2 and 7 afterward. The measurements were done using thread and a millimeter ruler while patients were seated. The distances between the anatomical landmarks were evaluated by 12 different methods. Results: According to the results of the measurements performed on twenty-six patients, (15 male and 11 female) with a mean age of 23.85±6.06 years, male had more swelling than female and the difference was statistically significant (p<0.05) although age, and measurement methods had no significant effect on swelling (p>0.05). Conclusion: As a result of the present study; twelve swelling evaluation methods showed significantly similar results and the authors recommended using Method 1 and 5 for convenient clinical evaluation which could be performed with a smaller number of anatomical points.Öğe Surgical management of stage-2 medication-related osteonecrosis of the jaw with transplantation of human amniotic membrane: Preliminary results(Elsevier Masson s.r.l., 2022) Çanakçı, F.Gülfeşan; Er, Nilay; Duygu, Gonca; Varol, G.FüsunMedication-related osteonecrosis of the jaw (MRONJ) is a drug adverse reaction. Seven osteonecrosis areas in 5 cases were treated with stage-2 MRONJ using human amniotic membrane (HAM) transplantation after sequestrectomy. Patients were evaluated in terms of infection (pain, erythema, and pus), mucosal coverage, and pain at 1, 2, 4, 8, and 12 weeks. Patients who showed improvement (total mucosal coverage, no sign of infection and pain) at the end of 12 weeks were followed up every 8 weeks. Also, radiographic examinations (panoramic radiography at every 8 weeks, cone-beam computed tomography at every 6 months) were performed to evaluate bone destruction. Complete mucosal closure was achieved in 6 necrosis sites. In only 1 patient, mucosal coverage was not achieved. No pain and infection relapse were observed during the follow-ups. HAM might be an effective material in terms of soft tissue healing and elimination of pain and infection for stage-2 MRONJ. Clinical Trials Registration Number: NCT04967963 © 2021Öğe The effect of local application of thymoquinone, Nigella sativa?s bioactive component, on bone healing in experimental bone defects infected with Porphyromonas gingivalis(Korean Acad Periodontology, 2022) Baştuğ, Ayşe Yılmaz; Tomruk, Ceyda Özçakir; Güzel, Elif; Özdemir, İlkay; Duygu, Gonca; Kütan, Esma; Arıcı, Fatma ÖzenPurpose: This study was performed to evaluate the influence of local application of thymoquinone (TQ) on bone healing in experimental bone defects infected with Porphyromonas gingivalis (PG). Methods: Forty-two female rats were randomly divided into 6 groups. A bone defect was created on the right tibia of all animals. The PG, PG/collagen membrane (COL) and PG/ TQ/COL groups were infected with PG. In the COL and PG/COL groups, the defects were covered with a COL; in the TQ/COL and PG/TQ/COL groups, the defects were covered with a TQ-containing COL. After 28 days, all animals were sacrificed. Quantitative measurements of new bone formation and osteoblast lining, as well as semiquantitative measurements of capillary density and tissue response, were analyzed. Furthermore, the presence of bacterial infections in defect areas was evaluated. Results: The new bone formation, osteoblast number, and capillary density were significantly higher in the TQ groups than in the control groups (P<0.001, P<0.001, and P<0.01, respectively). In a comparison between the TQ/COL group, with a TQ-containing COL (TQ/COL), and the PG-infected TQ-containing COL (PG/TQ/COL) group, the newly formed bone and capillary density were higher in the TQ/COL group (P<0.01). When the control group was compared to the PG, PG/COL, and PG/TQ/COL groups in terms of tissue response, the differences were statistically significant (P<0.001, P=0.02, and P=0.041, respectively). The intensity of the inflammatory cell reaction was higher in the PG, PG/COL, and PG/TQ/COL groups (P<0.05). Conclusions: Within the limitations of this study, the local application of a TQ-containing COL positively affected bone healing even if the bone defects were infected. The results suggest that TQ increased angiogenesis and showed promise for accelerating bone defect healing. Further research is warranted to support these findings and reach more definitive conclusions.Öğe Evaluation of dental anxiety in patients undergoing second-stage surgery with er, cr: YSGG laser treatment: Randomized clinical trial(Yuzuncu Yil Universitesi Tip Fakultesi, 2020) Tunç, Serap Keskin; Alpaslan Yaylı, Nazlı Zeynep; Talmaç, Ahmet Cemil; Feslihan, Erkan; Kaplan, VolkanOral surgical procedures cause high-pain expectation and consequent anxiety in patients. The aim of this study is to compare the effects of Er, Cr: YSGG laser and scalpel method on dental anxiety level during second-stage implant surgery. 96 patients with 304 osseointegrated implants were divided into two groups. Implants embedded under the oral mucosa were exposed with scalpel or laser surgery. Before the operation the patients were asked to fill the STAI and DAS while resting in the waiting room. In addition, postoperative daily analgesic use, VAS scores perioperativly and on the postoperative 1st, 2nd and 3rd days and demographic information such as age and gender were also recorded. There was no statistically significant relationship between surgical method and anxiety levels (p>0.05. Also, the differences between the scalpel and laser groups in terms of total DAS and STAI scores were statistically insignificant (p>0.05). But statistically significant difference was found between surgical method and the analgesic consumption (p<0.05). A higher rate of analgesic consumption was observed in the scalpel group. The use of Er,Cr;YSGG laser could reduce pain during minor oral surgical procedures but had no significant effect on dental anxiety. Different modalities that could provide additional benefits in overcoming this situation should be investigated. © 2020, Yuzuncu Yil Universitesi Tip Fakultesi. All rights reserved.Öğe The effect of age of titanium dental implants on implant survival and marginal bone resorption: A 5-year retrospective follow-up study(Allen Press Inc., 2020) Ciğerim, L.; Kaplan, VolkanIt has been demonstrated that the osteoconductivity, hydrophilicity, and biological capacity of titanium decreases over time, and this phenomenon was described as the biological aging of titanium. The aim of this study was to evaluate whether the age of sand-blasted and acid-etched (SLA) titanium dental implants (duration from the production date until the date of dental implant surgery) affects marginal bone resorption and implant survival. This nonrandom convenience-sample retrospective pilot study was carried out in 200 implants of 64 patients. Radiographic measurements were performed on intraoral periapical radiographs. Implants were divided into 2 age groups; group 1 = 0–3 months and group 2 = 36–41 months. A P value, <.05 was considered statistically significant. Of the implants, 41% (n = 82) were between 0 and 3 months old, and 59% (n = 118) were between 36 and 41 months old. All (n = 200) of the implants survived and maintained their function. The mean mesial marginal resorption measurement was 0.60 ± 0.65 mm, and the mean distal marginal resorption was 0.77 ± 1.07 mm. There was no statistically significant difference between the amount of mesial and distal marginal bone resorption according to implant age (P > .05). In SLA surface titanium implants with adequate initial primary stability and a 3-month osseointegration period before loading, biological aging of titanium did not affect implant survival and marginal bone resorption. © 2020 Allen Press Inc.. All rights reserved.Öğe Evaluation of corrosion resistance of Co-Cr alloys fabricated with different metal laser sintering systems(Korean Academy of Prosthodontic, 2020) Tuna, Süleyman Hakan; Karaca, Erhan; Aslan, İsmail; Pekkan, Gürel; Özçiçek Pekmez, NuranPURPOSE. The aim of this study was to evaluate the corrosion resistance of the specimens produced by five different commercial metal laser sintering (MLS) systems with their recommended Co-Cr alloy powders. MATERIALS AND METHODS. The MLS machines and the alloy powders used were, ProX 100-ST2724G (St-Pro), Mysint 100-EOS SP2 (SP2-Mys), EOSINT 270-EOS SP2 (SP2-EOS), SLM 100-Starbond CoS (SB-SLM), and MLab Cusing-Remanium® Star (RS-MLab), respectively. Eight specimens from each group were prepared. Open circuit potential (Eocp) and electrochemical impedance spectroscopy (EIS) measurements of polished surfaces of the specimens were conducted in a three-electrode cell using a potentiostat-galvanostat in Fusayama-Meyer artificial saliva (AS). Specimens from each group were immersed in AS and de-ionized water for seven days. Eocp, charge transfer resistance (Rct) values, and released ions (?g/cm2 x 7d) in different solutions were determined. The specimen surfaces were observed with SEM/EDS. Results were analyzed statistically. RESULTS. Eocp values have shifted to potentials that are more positive over time. Steady-state Eocp values were from high to low as follows, SB-SLM, SP2-Mys, SP2-EOS, RS-MLab, and ST-Pro, respectively. After 60 mins, RS-MLab specimens had the highest Rct value, followed by SP2-Mys, SB-SLM, SP2-EOS, and ST-Pro. In all groups, ion release was higher in AS than that in de-ionized water. CONCLUSION. There were small differences among the corrosion resistances of the Co-Cr alloy specimens produced with MLS systems; meanwhile, the corrosion resistances were quite high for all specimens. © 2020 The Korean Academy of Prosthodontics.Öğe Artık Co-Cr Alaşım Kullanımının Döküm Restorasyonlarının Korozyon Dirençleri Üzerine Etkisi(2019) Tuna, Süleyman HakanAmaç: Bu çalışmanın amacı Co-Cr alaşımlarının dökümünde,%50 artık alaşım (çupa) ilave edilmesi veya dökümdetamamen artık alaşımın kullanılması ile elde edilen örneklerinkorozyon direncini değerlendirmekti.Materyal-Metot: Dört farklı ticari Co-Cr alaşımından; %100yeni (I. Grup), %50 yeni+% 50 artık (II. Grup) ve %100 artık(III. Grup) formu kullanılarak kayıp mum döküm yöntemiile disk (5 mm çapta, 3 mm kalınlıkta) şeklinde 60 adet örnekhazırlandı. Elektrokimyasal testler, 25 ml yapay tükürüksolüsyonu içerisinde, üç hücreli düzenekte yapıldı. Elektrolizdensonra, örneklerin polisajlı düz yüzeylerinden, elektrokimyasalempedans spektroskopi ölçümü yapılarak R ohm değerleribelirlendi. Daha sonra örneklere -1,2 V’den başlayarak +1,6V’ye kadar 2 mVs-1 tarama hızında potansiyel uygulandı. Örnekyüzeylerinden salınan iyon miktarı ICP-MS kullanılarak ppmolarak belirlendi. Bulgular istatistiksel olarak analiz edildi. Herbirgruptan yüzeyi asitlenen örneklerin SEM görüntüleri incelendi.Bulgular: Salınan iyon miktarı bakımından I. ve III. örnekgrupları arasındaki farklar istatistiksel olarak önemli bulundu(P<0,01). Örneklerin I., II. ve III. grup R ohm değerlerininI. gruptan III. gruba doğru azaldığı görüldü. Ancak dökümörneklerinin ortalamaları arasındaki farklar istatistiksel olarakönemli bulunmadı (P=0,325). SEM görüntülerine göre I. veII. gruplar arasında belirgin farklılık görülmezken, III. grupörneklerin yüzeylerinde homojen örgü yapısının değişmeyebaşladığı belirlendi.Sonuç: Bu çalışmaya göre; Co-Cr alaşım örneklerine %50 artıkalaşım ilave edilmesi, örneklerin korozyon direncini önemlimiktarda değiştirmemiştir. Ancak örneklerin, tamamen artıkalaşımdan hazırlanması, korozyon direncini düşürmüştür.Öğe Effect of different sintering conditions on microstructural characterisation of Co-Cr metal laser powder(Inderscience Publishers, 2020) Pekkan, Gürel; Taşçı, Eda; Pekkan, Keriman; Ispalarlı, MuratCo-Cr alloys have been used for many years in dentistry. In recent years, the fabrication of prosthetic restorations from Co-Cr alloys by metal laser sintering method has become widespread. This method is a combination of powder metallurgy and three-dimensional printing technologies. The surface microstructure of the material and the different phases formed on the surface of the material after sintering and heat treatment are extremely important since these metal substructures are layered with dental porcelain in fixed prosthetic dentistry. In this study, characterisation of Co-Cr alloy samples produced by direct metal laser sintering (DMLS) method and sintering under various atmospheric conditions were performed with X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy-dispersive X-ray diffractometer (EDX). It was observed that sintering with different methods under various atmospheric conditions affected the XRD phase intensities. The sintering in the argon gas atmosphere yielded a more significant phase separation that facilitates the identification of different phases in XRD patterns. Copyright © 2020 Inderscience Enterprises Ltd.Öğe Evaluation of median mandibular flexure values in dentulous and edentulous subjects by using an intraoral digital scanner(Korean Acad Prosthodontics, 2022) Gülsoy, Merve; Tuna, Süleyman Hakan; Pekkan, GürelPURPOSE. Mandibular flexure is a crucial phenomenon that may affect the success of rigid bilateral mandibular prosthetic treatment. The aim of this study was to determine the amount of median mandibular flexure (MMF) that occurs during mouth opening from anterior to posterior mandible in seven different regions, in different age and gender groups of both dentulous and edentulous subjects, using an intraoral digital scanner. MATERIALS AND METHODS. In this study, the mandibular arch of 56 dentulous and 35 edentulous individuals were scanned with an intraoral scanner at both the minimum mouth opening (MnMO) and the maximum mouth opening (MxMO). MMF values were calculated by subtracting the distance value at the MxMO from the distance between the reference points at the MnMO at seven different mandibular regions of dentulous and edentulous subjects. In addition, the left and right side MMF values were measured. All data were analyzed statistically (alpha = .05). RESULTS. MMF value increased linearly from anterior to posterior mandible in both dentulous and edentulous individuals. The differences in MMF values were not statistically significant according to side (left/right), age, or gender (P > .05). No significant differences were found between the mean MMF values of the same region in both dentulous and edentulous individuals (P > .05). CONCLUSION. MMF was seen in different regions of the mandibles of both edentulous and dentulous individuals measured at the MxMO. Mandibular flexure should be considered for the success and prognosis of the long-span and rigid prostheses.Öğe Effect of micro blasting process parameters on 3D surface topography and surface properties of zirconia (Y-TZP) ceramics(Wiley, 2021) Yetik, Okan; Yavuzyeğit, Berzah; Yıldıran Avcu, Yasemin; Koçoğlu, Hurol; Pekkan, Gürel; Sarıdağ, Serkan; Avcu, EgemenThe present study aims to examine the effects of operational parameters on the surface topography and wear mechanisms of monolithic and conventional yttria-stabilized zirconia (Y-TZP) ceramics in the micro blasting process, performed under various acceleration pressures (1.5-3 bar), particle impact angles (30 degrees-90 degrees), and erodent particle sizes (50-460 mu m). Three-dimensional (3D) surface topography, surface roughness, and surface morphology of micro-blasted specimens were analyzed by using non-contact optical profilometry and SEM-EDS. The micro blasting characteristics of both Y-TZP were similar that increased blasting pressure and erodent particle size increased surface roughness. Erosion rate increased with increasing blasting pressure, whereas it decreased with increasing erodent particle size. Particle size was the most effective parameter on changing surface topography, while the particle impact angle had no distinct effect on the erosion rate, surface roughness, and surface topography of Y-TZP ceramics. SEM-EDS analyses showed that the primary wear mechanism during micro blasting was micro-cutting with a substantial amount of embedded particles on the material's surface.
