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    Effect of laser-assisted retrograde cavity preparation on push-out-bond-strength of mineral trioxide aggregate and calcium-enriched-mixture-cement
    (Universidade Estadual Paulista, Institute of Science and Technology of Sao Jose dos Campos, 2022) Bahadir, Hasibe Sevilay; Türkyilmaz, Ali; Bayraktar, Yusuf; Çelik, Çiğdem
    Objective: This study aimed to determine the push-out-bond-strength(PBS) of mineral trioxide aggregate (BIOMTA+) and calcium-enriched-mixture-cement (CEM) in retrograde cavities prepared using Er: YAG laser and stainless-steel bur. Material and Methods: The root canals of 60 extracted single-rooted human teeth were prepared, filled and their apical portion of 3-mm were resected using a diamond bur and randomly divided into four groups according to technique of retrograde preparation and filling material as follows(n=15): Group1: bur/ BIOMTA+,Group2: bur/ CEM, Group3: Er:YAG laser/ BIOMTA+, Group4: Er:YAG laser/ CEM. PBS test were performed to specimens and failure modes were evaluated. The data were statistically analyzed with ANOVA, Post-Hoc Tukey and t tests (p< 0.05). Results: CEM was exhibited higher than bond strength compared to BIOMTA+ in retrograde cavity prepared using laser (p= 0.021) and BIOMTA+ in retrograde cavity prepared using bur was exhibited higher than bond strength compared to in retrograde cavities prepared using laser (p= 0.024). Failure modes were dominantly cohesive in all groups tested and one representative specimen each failure mode was examined in SEM and the general characteristics of the failure modes were confirmed. Conclusion: With in the limitations of the present study, when used CEM, Er: YAG laser-assisted retrograde cavity preparation positively affected the bond strength values compared to BIO MTA+. Considering its optimal adhesion, the calcium-enriched-mixture-cement (CEM) might be a good option as a filling material in retrograde cavities in clinical use. © 2022, Universidade Estadual Paulista, Institute of Science and Technology of Sao Jose dos Campos. All rights reserved.
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    Effect of microabrasion on the staining susceptibility of enamel: An in vitro study
    (Tabriz University of Medical Sciences, 2022) Bahadir, Hasibe Sevilay; Haberal, Merve; Çelik, Çiğdem
    Background. Enamel microabrasion can eliminate enamel irregularities and discoloration. This study evaluated the staining susceptibility of enamel after microabrasion using different clinical protocols. Methods. A total of 210 extracted bovine incisors were used in this study. The teeth were randomly divided into five groups of 42 teeth each (n = 42), including group 1: control (no treatment), group 2: microabrasion, group 3: microabrasion + fluoride polishing, group 4: macroabrasion (fine-grit diamond bur) + microabrasion, and group 5: macroabrasion (fine-grit diamond bur) + microabrasion + fluoride polishing. The groups were then randomly divided into two subgroups for discoloration procedures: coffee and distilled water (n = 21). A spectrophotometric evaluation was carried out at baseline and on the 1st, 7th, 14th, and 28th days of the staining period. Statistical analyses were performed using repeated-measures ANOVA and the post hoc Bonferroni test at a significance level of 0.05. Results. The greatest color change was observed in group 2 specimens, which were immersed in coffee solutions. The color change values for groups 3, 4, and 5 specimens, which were immersed in distilled water, were higher than those in group 1 specimens (P < 0.05). The fluoride polishing + enamel microabrasion treatment groups (groups 3 and 5) exhibited greater resistance to color changes than the matched non-fluoride-polished groups (groups 2 and 4) (P < 0.05). Conclusions. The teeth that underwent enamel microabrasion treatment and were polished with fluoride gel became more resistant to color changes. Our findings confirm that enamel microabrasion treatment is a conservative method for localized discoloration. © 2022 The Author(s).
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    Evaluation of the repair capacities and color stabilities of a resin nanoceramic and hybrid CAD/CAM blocks
    (KOREAN ACAD PROSTHODONTICS, 2020) Bahadir, Hasibe Sevilay; Bayraktar, Yusuf
    PURPOSE. This study evaluated the color stabilities of two computer-aided design and computer-aided manufacturing (CAD/CAM) blocks and a nanofill composite resin and the microtensile bond strength (mu TBS) between the materials. MATERIALS AND METHODS. Twelve specimens of 4 mm height were prepared for both Lava Ultimate (L) and Vita Enamic (E) CAD/CAM blocks. Half of the specimens were thermocycled (10,000 cycle, 5 degrees to 55 degrees C) for each material. Both thermocycled and non-thermocycled specimens were surface treated with one of the three different methods (Er,Cr:YSGG laser, bur, or control). For each surface treatment group, one of the thermocycled and one of non-thermocycled specimens were restored using silane (Ceramic Primer II), universal adhesive (Single Bond Universal), and nanofill composite resin of 4 mm height (Filtek Ultimate). The other specimens were restored with the same procedure without using silane. For each group, 1 x 1 x 8 mm bar specimens were prepared using a microcutting device. Bar specimens were thermocycled (10,000cycle, 5 degrees to 55 degrees C) and microtensile tests were performed. Staining of the materials in coffee solution was also compared using a spectrophotometer. Data were analyzed using one-way ANOVA, t-test and post-hoc Scheffe tests. RESULTS. mu TBS were found similar between the thermocycled and non-thermocycled groups (P>.05). The highest mu TBS (20.818 MPa) was found in the non-thermocycled, bur-ground, silane-applied E group. Silane increased mu TBS at some E groups (P<.05). Composite resin specimens showed more staining than CAD/CAM blocks (P<.05). CONCLUSION. CAD/CAM blocks can be repaired with composite resins after proper surface treattilents. Using silane is recommended in repair process. Color differences may be shown between CAD/CAM blocks and the nanofill composite after a certain time period.
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    The comparison of the repair bond strength of the composite resin to direct and indirect composite restorations with different surface preparations
    (Tabriz University of Medical Sciences, 2023) Bahadir, Hasibe Sevilay; Polatoğlu, Selin; Tuncer, Duygu; Çelik, Çiğdem
    Background. Indirect restorations have been employed in restorative dentistry to solve some of the drawbacks of direct restorations. The aim of this study was to evaluate the effect of different modes of a universal adhesive resin on the repair capacity of two indirect resin composites and a direct resin composite. Methods. Indirect composite resins (Ceramage and Gradia Plus) and a direct composite resin (Filtek Z250) were prepared in a plastic mold with a height and diameter of 2-mm and 6-mm, respectively. Composite blocks were thermocycled (5000 cycles, 5°C-55°C). Then, according to their surface treatments, composite blocks were categorized into six-groups: Group 1: ER (etch&rinse), Group 2: SE (self-etch), Group 3: Bur + ER (bur + etch&rinse), Group 4: Bur + SE (bur + self-etch), Group 5: Bur + Silane + ER (bur + silane + etch&rinse), Group 6: Bur + Silane + SE (bur + silane + self-etch), respectively. After surface treatments and adhesive application for bonding with a direct resin composite, all groups were then thermocycled before performing shear-bond-strength-test. Failure modes were evaluated using a stereomicroscope. Data were analyzed by two-way-ANOVA and Bonferroni-test (P < 0.05). Results. The highest bond-strength values were obtained for Bur + Silane + SE groups, while the lowest values were obtained for the Bur + Silane + ER groups for all materials. Statistically significant differences were observed between the Bur + Silane + ER group and ER, Bur + ER and Bur + Silane + SE groups in Gradia Plus (P < 0.05). Conclusion. The self-etch-mode of the universal-adhesive and silane applications led to the increase in the repair-strength of the adhesive in the Filtek Z250 and Ceramage. The self-etch-mode of the universal-adhesive might be used to reduce adhesive-application-steps in the clinical repair procedures. © 2023 The Author(s).
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    The effect of Turkish dental practitioners' perceptions and experience of ICDAS II on caries treatment decisions
    (Kerman Univ Medical Sciences, 2022) Bahadir, Hasibe Sevilay; Celik, Cigdem
    Background: The International Caries Detection and Assessment System (ICDAS) was developed to integrate several criteria systems into one standard system for caries detection and assessment. The aim of this study was to identify Turkish dental practitioners' perceptions and experience about ICDAS II and assess how they could affect clinical decision-making. Methods: A web-based data collection form, including demographic characteristics, experience of caries detection systems, and two different clinical images with caries and treatment options, was given to Turkish dental practitioners. Data were analyzed with the chi-square test and logistic regression using SPSS 22.0 software (IBM, Chicago, IL) at a significance level of P< 0.05. Results: Data collection forms were completed by 382 general dental practitioners. For the first clinical scenario 70.7% of the practitioners decided that no treatment was required. For the second clinical scenario 89.5% of the practitioners decided to perform tooth restoration. Considering the clinical scenario 2 treatment options, while practitioners working in the public hospital marked amalgam restoration at a higher rate, practitioners working in private clinics marked composite resin restoration and root canal treatment at a higher rate (P < 0.05). With regard to effects on treatment choices for clinical scenarios, binary logistic regression analysis found no significant effects of gender, age, or institution (P> 0.05). Conclusion: The visual caries detection system, ICDAS II, was a useful tool in standardizing caries diagnostic skills for practitioners and improving decision-making abilities on caries treatment.