Browsing by Author "Arhun, N."

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Clinical Evaluation of Microhybrid Composites in Noncarious Cervical Lesions: 24-Month Results
(2017) Tuncer, D.; Celik, C.; Yamanel, K.; Arhun, N.; 0000-0002-5936-0196; 28091433; R-2536-2019; AAA-1576-2021
Objective: To evaluate the clinical performance of two different microhybrid resin composites in noncarious cervical lesions (NCCLs) after 24 months. Subjects and Methods: Ninety-seven NCCLs were restored with either TPH Spectrum (n = 48) or Filtek Z250 (n = 49) using an etch-and-rinse adhesive in 20 patients. The restorations were clinically evaluated using modified United States Public Health Service criteria for retention, color match, marginal discoloration, marginal adaptation, surface texture, anatomic form, postoperative sensitivity, and secondary caries. The restorations were assessed 1 week after placement (baseline) and after 6, 12, and 24 months. Restoration survival rates were calculated using the Kaplan-Meier procedure estimator, and a log-rank test was used to compare the survival distributions (P < 0.05). Statistical analysis was undertaken using Pearson's Chi-square test and Fisher's exact test to assess differences among the restorative materials (P < 0.05). Cochran's Q-test was employed for evaluating differences in the same restorative material between recall periods. Results: The retention rates were 100% at 6 months, 89.6% and 91.8% at 12 months, and 85.4% and 89.8% at 24 months for TPH and Z250, respectively. TPH showed a statistically significant difference in marginal discoloration between the baseline and 24 months results (P < 0.05). Both TPH and Z250 showed statistically significant differences in marginal adaptation between the baseline and 24 months results (P < 0.05). Conclusion: Over the 24-month period, both microhybrid resin composites demonstrated acceptable clinical results in NCCLs.
Effect of desensitizing tooth pastes hn dsfferent restorative materials' bond strength to coronal and root dentin
(2018) Yamanel, K.; Arhun, N.
Aim: The aim of the study was to evaluate the effects of two desensitizing tooth-pastes on the shear bond strength of resin composite and glass ionomer restorative materials to coronal and root dentin. Materials and Methods: 108 human third molars' distal or mesial sides were ground flat with a silicon-carbide paper. The samples were randomly divided into 3-major groups (N=36) to be brushed with: GroupA: Sensodyne Rapid Relief; GroupB: Colgate Sensitive Pro-Relief; GroupC: Colgate Total 12 toothpastes. Brushing was performed with tooth brushing simulator 2 times/day for 10 days with 10 strokes/brushing. They were further divided into three sub-groups (n=12) to receive the following adhesion protocols to coronal/root dentin. Group1: Clearfil SE Bond + Filtek Z250 Composite; Group2: Adper Single Bond2 + Filtek Z250Composite; Group3: Riva Glass Ionomer Cement. Samples were kept in distilled water for 24 hours. Shear bond strength test was performed with Universal Test Machine (cross head speed: 0.5 mm/sec). The data were evaluated statistically. Results: For all restorative techniques evaluated, the least shear bond strength values were obtained after Sensodyne Rapid Relief usage.Riva Glass Ionomer Cement demonstrated statistically significant inferior shear bond strength values than resin composite. Conclusion: Self-etch systems may be the choice for adhesion after desensitizing toothpaste usage. © 2018 Cumhuriyet University Faculty of Dentistry.
The Effect of Radiotherapy on the Marginal Adaptation of Class II Direct Resin Composite Restorations: A Micro-computed Tomography Analysis
(2022) Oglakci, B.; Burduroglu, D.; Eris, A. H.; Mayadagli, A.; Arhun, N.; 35226728
This laboratory study was designed to evaluate the marginal adaptation of Class II mesio-occluso-distal (MOD) restorations at the cervical region with micro-computed tomography (micro-CT). Two groups of restorations were compared: 1) those that had been exposed to radiotherapy before restoration was performed using a universal adhesive in etch-and-rinse and self-etch modes; and 2) those that had previously been restored using a universal adhesive in etch-and-rinse and self-etch modes and had subsequently undergone radiotherapy. Sixty intact human molars were randomly divided into groups according to irradiation status: no radiotherapy (control group); radiotherapy followed by restoration (radiotherapy-first group); and restoration followed by radiotherapy (restoration-first group). These three groups were then subdivided into two groups each on the basis of adhesive application type (etch-and-rinse and self-etch modes), for a total of six groups (n=10/group). Standardized Class II MOD cavities were prepared. A universal adhesive (Clearfil Universal Bond Quick, Kuraray, Okayama, Japan) was applied. The teeth were restored with resin composite (Estelite Posterior Quick, Tokuyama, Tokyo, Japan). The radiotherapy protocol was conducted with 60 gray (Gy) at 2 Gy/day, five days a week for six weeks. Adhesive defects were analyzed in distal and mesial views and evaluated with micro-CT (SkyScan 1174v2, Kontich, Antwerp, Belgium) on the basis of the volume of black spaces between the cavity walls and the restorative materials (mm(3)). The data were analyzed using the Kruskal-Wallis, Mann Whitney U and Wilcoxon tests (p<0.05). The radiotherapy protocol did not affect the marginal adaptation of the universal adhesive at the cervical regions. Regarding the application modes, for the radiotherapy-first group, the self-etch mode caused significantly higher adhesive defects than the etch-and-rinse mode at the dentin margin. For the no-radiotherapy group, the adhesive defects at the dentin margin were significantly higher than at the enamel margin with the application of the etch-and-rinse mode.
Shear Bond Strength of Different Adhesive Systems in Amalgam Repair
(2020) Ercin, O.; Alkan, F.; Arhun, N.; 0000-0003-3379-4567; R-2536-2019
The purpose was to evaluate the effect of different adhesive systems on shear-bond-strength between amalgam and resin composite. 48 amalgam specimens were condensed into plastic tubes (4 mm diameter x 5 mm height). The specimens were kept in incubator for 24 h at 37 degrees C, aged by thermal cycling 1000 times between 5-55 degrees C. The specimens' surfaces were finished with coarse diamond burs and randomly divided into 4 groups (n = 12) with respect to different surface conditioning methods: etchant+universal adhesive (All-Bond Universal, Bisco), universal adhesive, alloy primer (Z-Prime, Bisco)+universal adhesive, self-adhesive resin cement (BisCem, Bisco). The old amalgam specimens were placed into plastic tubes (4 mm diameter x 8 mm height) and all adhesive systems were used according to manufacturer's instructions. Resin composite (Charisma Classic, Haraeus Kulzer) was placed and polymerized 20 s. The samples were incubated in distilled water at 37 degrees C for 24 h prior to the shear-bond-strength test. The shear-bond-strength test was accomplished using a universal testing device. Statistical analyzes were made with One-way ANOVA and Tukey HSD tests. There was no significant difference between self-adhesive resin cement and alloy primer applied groups but showed better bond strength values than self-etch and etch&rinse adhesive applied groups. The application of self-adhesive resin cement and alloy primer+universal adhesive in amalgam repair exhibited successful outcomes.