Diş Hekimliği Fakültesi / Faculty of Dentistry
Permanent URI for this collectionhttps://hdl.handle.net/11727/2120
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Item Is The Repair Bond Strength Affected When Substrate And Repair Composite Are Not Of The Same Kind? A Systematic Review And Meta-Analysis: Effect Of Repair Composite On Repair Bond Strength(Başkent Üniversitesi Diş Hekimliği Fakültesi, 2024-03-21) Kose, Leyla Kerimova; Isik, Hatice; Eyuboglu, Tan Firat; Ozcan, Mutlu; Cehreli, Sevi Burcak; Arhun, NeslihanThe aim was to evaluate the influence of repair resin type on repair bond strength in the direct resin restorations through a systematic review. Electronic databases MEDLINE via PubMed, Web of Science, Scopus, BBO, and LILACS were searched, and the reference lists of relevant studies were further hand-searched. A total of 15,709 articles that were browsed yielding to a final of five studies were included in meta-analysis. Analyses were performed using R software with the 'metafor' package, with standardized mean differences employed. A multi-level meta-analysis was conducted utilizing restricted maximum-likelihood estimates (p <= .05). In the shear bond strength group, significant heterogeneity was observed (Q = 50.274, p < .0001), whereas no significant heterogeneity was detected in the microtensile bond strength group (Q = 5.102, p = .4063). Separate analyses of both shear bond strength and microtensile bond strength groups showed no statistically significant differences between dissimilar and similar materials (p > .05). Egger's regression indicated no evidence of publication bias in either group. Sensitivity analyses revealed statistically insignificant pooled effect sizes for shear bond strength. In the microtensile group, one study influenced the results when excluded from the analysis. It could be suggested that the repair of composite resin with the same kind of resin composite is not mandatory.Item Is The Repair Bond Strength Affected When Substrate And Repair Composite Are Not Of The Same Kind? A Systematic Review And Meta-Analysis: Effect Of Repair Composite On Repair Bond Strength(Başkent Üniversitesi Diş Hekimliği Fakültesi, 2024-03-21) Kose, Leyla Kerimova; Isik, Hatice; Eyuboglu, Tan Firat; Ozcan, Mutlu; Cehreli, Sevi Burcak; Arhun, NeslihanThe aim was to evaluate the influence of repair resin type on repair bond strength in the direct resin restorations through a systematic review. Electronic databases MEDLINE via PubMed, Web of Science, Scopus, BBO, and LILACS were searched, and the reference lists of relevant studies were further hand-searched. A total of 15,709 articles that were browsed yielding to a final of five studies were included in meta-analysis. Analyses were performed using R software with the 'metafor' package, with standardized mean differences employed. A multi-level meta-analysis was conducted utilizing restricted maximum-likelihood estimates (p <= .05). In the shear bond strength group, significant heterogeneity was observed (Q = 50.274, p < .0001), whereas no significant heterogeneity was detected in the microtensile bond strength group (Q = 5.102, p = .4063). Separate analyses of both shear bond strength and microtensile bond strength groups showed no statistically significant differences between dissimilar and similar materials (p > .05). Egger's regression indicated no evidence of publication bias in either group. Sensitivity analyses revealed statistically insignificant pooled effect sizes for shear bond strength. In the microtensile group, one study influenced the results when excluded from the analysis. It could be suggested that the repair of composite resin with the same kind of resin composite is not mandatory.Item Effect Of Ultrasonic And Sonic Instrumentation On Shear Bond Strength Of Resin Composite To Enamel: An In Vitro Study(AMERICAN JOURNAL OF DENTISTRY, 2024-04-12) Adiguzel, Ruhsan Muduroglu; Mustafa, Abdelrahman; Oduncuoglu, Bahar Fusun; Colak, Mew Yavuz; Gulsahi, Aye; Arhun, NeslihanPurpose: To assess and compare the effects of sonic and ultrasonic instrumentation on shear bond strength (SBS) and investigate the influence of adhesive system application modes (etch&rinse/self-etch) on SBS. Methods: In this experimental study, 45 extracted sound human molars were selected. Mesial and distal surfaces of the teeth were abraded until 90 smooth enamel surfaces were obtained. Specimens were divided into two groups, with half (N= 45) conditioned in etch&rinse mode and the remaining (N= 45) in self-etch mode using Tetric N Bond Universal. Composite resin discs were produced on these surfaces by filling Teflon molds. All specimens were aged via thermocycling. Each group was further divided into three more groups (n= 15) according to the type of periodontal instrumentation (ultrasonic, sonic or none). SBS values were recorded and analyzed using two-way ANOVA. Fracture sites were examined under a stereomicroscope. Results: The type of periodontal instrumentation had no significant effect on SBS values, whether sonic, ultrasonic or their absence (P= 0.945). The type of adhesive system mode had a significant influence on the shear bond strength values. Etch&rinse groups had significantly higher shear bond strength values than self-etch groups (P< 0.001).Item Effect of A Calcium Phosphate-Containing Desensitizing Agent on Postoperative Sensitivity: A Split-Mouth, Randomized Controlled Study(2023) Kerimova Kose, Leyla; Yilmaz, Ayfer Ezgi; Yamanel, Kivanc; Arhun, Neslihan; 37865810Purpose: To evaluate the effectiveness of a calcium phosphate-containing-desensitizer (Teethmate Desensitizer - TD), caries type, subject age, and preoperative hypersensitivity on postoperative sensitivity (POS) after composite restorations on deep or extremely deep lesions. Methods: 50 subjects, having two teeth with deep or extremely deep caries, participated in this study. TD was applied randomly to one tooth of each participant, and all teeth were restored with composite resin (Filtek Z250). After 1 week, POS was evaluated according to NRS (numerical rating scale) and VAS (visual analogue scale) by using participant diaries. At 6 weeks, POS was assessed considering subjects' reports. The normality of data was analyzed with Shapiro-Wilk test. For analyses, Pearson's chi-squared test, Mann-Whitney U and the Wilcoxon Signed-Rank test were used, and the effect sizes (ES) were calculated (alpha= 0.05). Results: 47 of the participants completed the 6-week study. There was a small effect size noted for TD for NRS and VAS (P> 0.05, ES < 0.30). Also, there was no statistically significant difference between POS and subject age (P= 0.294, ES= 0.161), type of caries (P= 0.680, ES= 0.042) and preoperative sensitivity (P= 1.000, ES= 0.138) after the first week.Item Comparison of Microleakage of A Multi-Mode Adhesive System with Contemporary Adhesives in Class II Resin Restorations(2014) Tuncer, Duygu; Celik, Cigdem; Cehreli, Sevi Burcak; Arhun, Neslihan; https://orcid.org/0000-0002-5936-0196; AAA-1576-2021; AAD-6138-2021; R-2536-2019Aim: The aim was to compare the microleakage of resin composite bonded with different adhesive systems in class-II cavities at enamel or dentine margins. Material and methods: 60 extracted human molar teeth received slot cavity preparations on mesial and distal surfaces (mesial cervical margin was prepared in enamel and distal in dentine). They were randomly divided into five groups (n=12) according to the adhesive system: Group-A: Silorane Bond (S), Group-B: Adper Single Bond 2 (SB), Group-C: Clearfil SE Bond (CSE), Group-D: Single Bond Universal (USel) (selective etch-and-rinse), Group-E: Single Bond Universal (USE) (all-in-one). The preparations were restored using the same resin composite (Filtek Ultimate) except Group A which was restored by Silorane composite. The teeth were thermocycled, immersed in dye, sectioned, and dye penetration was evaluated quantitatively using image analysis. The data were analyzed using the two-way analysis of variance and Bonferroni test. Results: In all groups, there was no statistically significant difference between enamel margins at occlusal and gingival sites (p>0.05). The statistical difference between Group-A (S) and Group-B (SB) was significant at all margins. Group-B (SB) presented the greatest microleakage amounts at all margins and the highest scores were obtained in the dentine. Likewise, SB demonstrated statistically significant differences between dentine and enamel margins (occlusal and gingival)(p<0.05). Conclusion: All adhesive systems showed similar microleakage values between enamel margins in occlusal and gingival regions. However, when the gingival margin is located in the dentine, etch&rinse adhesive systems may not be a choice in terms of microleakage prevention.Item Microtensile Bond Strength of Composite-to-Composite Repair with Different Surface Treatments and Adhesive Systems(2014) Celik, Cigdem; Cehreli, Burcak Sevi; Bagis, Bora; Arhun, Neslihan; https://orcid.org/0000-0002-5936-0196; AAA-1576-2021; R-2536-2019Objectives: The purpose was to investigate the effect of different surface treatments and bonding agents on the repair bond strength of different resin-based restorative materials by microtensile bond strength (TBS) testing protocol. Materials and Methods: 24 Grandio SO(VOCO) and 24 Filtek Z250(3M) resin composite blocks were prepared. Half of the samples (N=12) were diamond bur-roughened and the other half (N=12) were sandblasted by 50m aluminum oxide particles. They were further divided into four sub-groups (n=3) and received the following: Sub-Group1: Adper Single Bond2 (Etch&Rinse) (3M); Sub-Group2: Clearfil SE (Self-etch) (Kuraray); Sub-Group3: Beauty Bond (HEMA-free all-in-one) (Shofu); Sub-Group4: All Bond3 (HEMA-free, hydrophobic, etch&rinse) (Bisco). The samples were repaired by Filtek Z250 to form a block. All of the resultant sub-groups combinations consisted of one of the composite type, surface treatment type, and adhesive systems. A total of 18 groups were prepared including 2 homogeneous blocks. They were thermocycled and TBS measurements were performed. Data were statistically analyzed with Kruskall-Wallis and Mann-Whitney U tests. Results: The experimental regroups' TBS reached to 34.67-66.36% and 43.44-95.52% of the cohesive bond strength for Grandio SO and Z250, respectively. The pre-existing composite type is found to be statistically important. When the surface is bur-finished Grandio performed better; when air-abrasion is considered Z250 showed higher bond strength. All-in-one adhesive system produced the weakest bond strength at all parameters. Conclusion: It may be suggested that when the pre-existing composite is unknown, air-abrasion may be performed with etch&rinse or two-step self-etch adhesives.Item Dental Students' Ability to Assess Their Performance in a Preclinical Restorative Course: Comparison of Students' and Faculty Members' Assessments(2015) Tuncer, Duygu; Arhun, Neslihan; Yamanel, Kivanc; Celik, Cigdem; Dayangac, Berrin; 0000-0002-5936-0196; 26034030; R-2536-2019; AAA-1576-2021Dental education consists of both theoretical and practical learning for students to develop competence in treating patients clinically. When dental students encounter practical courses in their first year as a new educational experience, they must also learn to evaluate themselves. Self-evaluation is an essential skill to learn for dental professionals to keep increasing their competence over the course of their careers. The aim of this study was to compare the assessment scores of second- and third-year dental students and the faculty in two consecutive preclinical practical exams in restorative dentistry courses in a dental school in Turkey. Faculty- and student-assigned scores were calculated from two consecutive preclinical examinations on tooth restorations performed on both artificial casts and phantom patients. The students were formally instructed on grading procedures for tooth preparations, base and restoration placement, and polishing criteria. After each step, each item was assessed by faculty members, the student, and another student. The results indicated that the initial differences between second-year students' assessments of their own preclinical practical ability and that of the faculty decreased among the third-year students. Self-evaluation scores did not indicate whether the third-year students tended to over- or underestimate the quality of their own work. However, the second-year students not only overestimated themselves but thought they were above average. The results point to the need to develop students' self-insight with more exercises and practical training.Item How Does Radiotherapy Affect the Adhesion of Universal Adhesive to Enamel and Dentin? A Qualitative and Quantitative Analysis?(2022) Oglakci, Burcu; Burduroglu, Defne; Eri, Ali Hikmet; Mayadagli, Alpaslan; Arhun, NeslihanThis study investigated the shear bond strength (SBS) of a universal adhesive to enamel/dentin; 1) that had undergone radiotherapy (RT) and 2) that were readily restored and had undergone RT. Enamel and dentin surfaces were obtained from 90 intact human molars. They were randomly divided into six groups according to the presence and timing of irradiation (RTO:no radiotherapy/control, RT1:RT before restoration, RT2:RT after restoration groups) and adhesive application modes (etch&rinse/ER, self-etch/SE)(n=15). A universal adhesive and resin composites were applied. The radiotherapy protocol was conducted with 60 Gy. The SBS test was subjected (1mm/min) and failure type analysis was performed. The resin-enamel/ dentin interfaces were examined. Data were statistically analyzed. For enamel and dentin, the presence and timing of irradiation did not significantly influence the SBS values (p>0.05). For enamel, significantly higher SBS values were obtained using etch&rinse mode than self-etch mode (p<0.05). The predominant failure was mixed type. Loss of enamel prisms and obliterated irregular dentinal tubules were found for the radiotherapy-treated specimens. Resin tags were clearer in the irradiated enamel treated with ER than SE. Irradiation with different timings did not influence the bond strength to enamel and dentin, negatively. Irrespective of radiotherapy, the etch&rinse mode caused higher bond strength to enamel than self-etch mode.Item Does Radiopacity of Restorative Materials Change with Aging?(2017) Tuncer, Duygu; Gulsahi, Ayse; Cehreli, Sevi Burcak; Arhun, Neslihan; AAD-6138-2021; R-2536-2019Background: Dental materials should be radiopaque enough to be identified from enamel and dentin and enable the detection of secondary caries, marginal defects. The aim was to evaluate the radiopacity of restorative materials after 6 months of aging in distilled water. Material and Methods: Twenty-two restorative materials were used and the radiopacity them were first evaluated after setting and after 6-months of storage in distilled water. Human primary and permanent tooth slices were also used in the study. Restorative material specimens were prepared by using Teflon molds. Twelve specimens were prepared for each material group. All specimens were exposed together with an aluminum stepwedge using a phosphor plate. The analysis was made with Digora system. Results: Filtek-Silorane, Aelite-LSPosterior, Theracal-LC, Biodentine, Ionofil-U, Vitrebond and GCP-Glass-Seal exhibited lower radiopacity values at the initial setting and after 6-months of aging with respect to permanent enamel. When compared with deciduous enamel, Filtek-Z550, Charisma, Riva-Light Cure and Equia-Fil exhibited lower radiopacity values at both readings. Spectrum-TPH, Filtek-Ultimate, Clearfil-Majesty Flow, Sultan-Versa, IRM and Adhesor exhibited statistically significant higher values of radiopacity at the 6-month evaluation. Conclusion: The radiopacity of restorative materials is dependent on the material type exerting different radiopacity values after 6-months.Item The Practices of Treating Deep Carious Lesions Compared with the Dental Curriculum in Turkish Dentistry(2022) Kerimova, Leyla; Karabulut, Erdem; Yamanel, Kivanc; Arhun, NeslihanObjective: The aim of this cross-sectional study is to investigate Turkish dentists' opinions and preferences regarding the management of deep carious lesions and compare them with modern dental education concepts as provided by dental schools. Methods: Questionnaire 1 and Questionnaire 2 were sent separately to dental practitioners via the Turkish Dental Association and to university department heads of restorative dentistry. The data obtained were analyzed using chi-square tests and one-way ANOVA tests (p < 0.05). Results: Regarding Questionnaire 1, most of the dentists (89.3%) responded that caries lesions should be removed completely up to the hard cut-off condition of the cavity floor. There was a statistically significant difference between female and male dentists' preferences on less invasive treatment (p < 0.05). Female dentists prefer less invasive treatment compared with male dentists (p = 0.002). Relatively older dentists (mean age = 41.8) are more inclined towards complete caries removal even if pulp exposure is likely (p = 0.040). The results of Questionnaire 2 reveal that there is no association between the time spans of education at dental schools and their caries removal approach curriculum (p > 0.05). Most department heads of restorative dentistry prefer to apply complete caries removal (78.5%, n = 51). Conclusion: Despite today's curriculum encouraging less invasive caries removal techniques, most dentists prefer more invasive treatment options. Continuous education of contemporary dentistry could update these clinical treatment attitudes of dentists and improve their clinical practice.