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Öğe Bond strength of ceramic or resin CAD-CAM laminate veneers(Mosher & Linder, Inc, 2020) Bakir, Metin; Bakir, Sehmus; Bahsi, EmrullahPurpose: To compare the bond strength of ceramic or resin laminate veneers produced using computer assisted design/computer assisted machining (CAD-CAM). Methods: 80 teeth were prepared for laminate veneer, and divided into eight groups of different CAD-CAM blocks in each group. Each group was restored with the manufacturers' recommended procedures. After cementation of the veneers, all samples were thermocycled (1,000 cycles); the crowns of the teeth were embedded vertically into acrylic blocks and subjected to shear bond strength in a universal tester. Shear bond strength was determined in Newtons (N). Results: The tests showed 52.5% cohesive failure, 30% adhesive failure, and 17.5% adhesive-cohesive failure (mixed). Lava Ultimate had the highest bond strength average and the Cerec blocks had the lowest with 82.2N. Lava Ultimate, Cerasmart, and E-Max's shear bond strength values were statistically different compared to Vitablocs Mark II, Cerec Blocs, GC Initial LRF Blocks (P< 0.05). The difference between the Vitablocs Mark II and Cerec Blocs and the Vita Enamic block was statistically significant. There was no statistically significant difference among the other groups. The selected CAD-CAM material affected the shear bond strength of the laminate veneers.Öğe Comparative Evaluation of Antimicrobial Efficacy and Fluoride Release of Seven Different Glass-Ionomer-Based Restorative Materials(Quintessence Publishing Co Inc, 2020) Sagmak, Savas; Bahsi, Emrullah; Ozcan, Nida; Satici, OmerPurpose: The aim of this study was to evaluate one high-viscosity glass-ionomer cement (EQUIA/GC), two resin-modified glass ionomers (Fuji II LC/GC, Photac Fil Quick Aplicap/3M Oral Care), two traditional glass ionomers (Ketac Molar Easymix/3M, Fuji II/GC), and two compomers (Freedom/SDI, Dyract XP/Dentsply Sirona) through a comparison of fluoride release and antimicrobial effects. Materials and Methods: A total of 210 samples were prepared, as 10 for each of the 7 materials for fluoride release and 20 for each material for the antimicrobial effect tests. To measure fluoride release, 5 ml distilled water and 5 ml TISAB II were added to the samples, which were then incubated at 37 degrees C. The fluoride levels of the material were measured using the selective ion electrode on days 1, 3, 7, 14 and 28. To compare the antimicrobial effects, 20 samples were divided in two groups and implanted in culture media containing Streptococcus mutans and Lactobacillus acidophylus. Measurements were taken on days 2, 4 and 6. The diameter of the inhibition zone was recorded in millimetre (mm). Results: All the materials released fluoride and the difference between them was determined to be statistically significant (p < 0.01). The antimicrobial effect values of the materials against S. mutans and L. acidophylus were evaluated and statistically significant difference was determined between the materials on all the measurement days. Conclusions: All the materials were observed to release fluoride. With the exception of the compomers, all the other materials showed an antimicrobial effect against S. mutans and L. acidophylus.Öğe Comparative Evaluation of the Effects of Ozone, Diode Laser, and Traditional Cavity Disinfectants on Microleakage(Taylor & Francis Inc, 2014) Gunes, Sifa; Bahsi, Emrullah; Ince, Bayram; Colak, Hakan; Dalli, Mehmet; Yavuz, Izzet; Sahbaz, CaferAim: This study aimed to evaluate the effects on microleakage of the application of ozone gas, laser and traditional cavity disinfection under in vitro conditions. Material and Methods: Ninety third-molar teeth extracted for various reasons were used in this study. All the teeth were prepared with a standard V cavity on the buccal surface. Then the teeth were randomly allocated to one of 6 groups of 15 teeth; Group 1 benzalkonium chloride, Group 2 chlorhexidine gluconate, Group 3 sodium hypochloride, Group 4 diode laser, Group 5 ozone gas, Group 6 control group- no disinfection was applied. Primer was applied to the cavities, then bond and 10-s polymerization. Clearfil AP-X was used in the cavities as a hybrid composite and polymerized for 20 s. The samples then underwent 1000 thermal cycles of 30-s application, in baths at temperatures between 5 +/- 2 degrees C and 55 +/- 2 degrees C. All the samples were stirred in 0.5% basic phuxine solution and the sections taken under stereomicroscope were examined and photographed at 15 x magnification. SEM analysis was made and the obtained results were statistically evaluated with the Kruskal-Wallis test. Results: No significant difference was seen between the groups in respect of the microleakage values of both the occlusal and gingival edges (p < 0.05). Comparison of the microleakage values of the occlusal and gingival edges of the groups determined the least leakage to be in the ozone group (p < 0.05). Conclusion: No statistical significance was determined between the groups. However, the mean least microleakage was found in the ozone group and the highest amount in the control group.Öğe Do ozone and boric acid affect microleakage in class V composite restorations?(Taylor & Francis Inc, 2019) Cangul, Suzan; Yildirim, Zehra Susgun; Bahsi, Emrullah; Sagmak, Savas; Satici, OmerThe aim of this in vitro study was to evaluate the effects of chlorhexidine gluconate (2%), sodium hypochloride (2.5%), ozone gas, and boric acid at different concentrations (1%, 3%, 5%, and 7%) on microleakage from composite restorations.In a total of 80 extracted human canine teeth, a class V cavity was opened on the buccal surface and the samples were separated into eight groups. In the control group, no procedure was applied for cavity disinfection, then composite restoration (Z250, 3M) was made using single-stage, self-etch adhesive (Single Bond 3M). In the other groups, seven different disinfectants were used, then the cavity was restored. The teeth were split into two in the buccolingual direction, parallel to the long axes. Stain penetration was examined under stereomicroscope and scored. Examination with SEM was made on one sample from each group, selected at random. Statistical evaluations were made using Dunnett C Post Hoc Comparison and Kruskal-Wallis H tests.In the occlusal region evaluation, the groups with the lowest level of leakage were the 3% and 5% boric acid groups, and the highest levels of microleakage were determined in the chlorhexidine group and the 1% boric acid group. In the gingival region, the lowest level of microleakage was in the 5% boric acid group and the highest levels were determined in the 1% and 7% boric acid groups.Boric acid disinfectants used at suitable concentrations were not seen to create a risk in respect of microleakage.Öğe Effect of 1% chlorhexidine gel on the bonding strength to dentin(Elsevier Taiwan, 2010) Dalli, Mehmet; Ercan, Ertugrul; Zorba, Yahya Orcun; Ince, Bayram; Sahbaz, Cafer; Bahsi, Emrullah; Colak, HakanBackground/purpose: The purpose of this in vitro study was to evaluate the effect of 1% chlorhexidine (CHX) gel on dentin bond strengths of posterior composite resin applied with two different adhesive systems. Material and methods: In total, 75 extracted, caries-free human molars were used. The occlusal surface of each tooth was ground to create a flat dentin surface. Then, each tooth was mounted in acrylic. The dentin specimens were randomly assigned to five groups of 15 specimens each. In Group 1, Prime Et Bond NT (PBNT) was applied; in Group 2, a 1% CHX gel + etching for 15 s + PBNT were applied; in Group 3, etching + 1% CHX gel + PBNT were applied; in Group 4, Clearfil S-3 Bond was applied; and in Group 5, 1% CHX gel + Clearfil S-3 Bond were applied. A dentine bonding system was applied to dentin surfaces, and composite cylinders were built up using a special device and then light-polymerized. Specimens were mounted and sheared using an Instron universal testing machine at a cross-head speed of 0.5 mm/min. Results: The results were recorded in megapascals. The sheared specimens were examined under a light microscope, and the type of failure (adhesive, cohesive or mixed) was recorded. Data were compared by one-way analysis of variance and Tukey's honestly significant difference tests. Means were 16.4 +/- 4.1 MPa in Group 1, 16.2 +/- 3.9 MPa in Group 2, 13.0 +/- 4.5 MPa in Group 3, 11.9 +/- 2.7 MPa in Group 4, and 11.5 +/- 2.7 MPa in Group 5. The use of 1% CHX gel before acid etching was significantly higher than after etching on the shear bond strength of PBNT (P < 0.05), but did not differ significantly from PBNT alone (P > 0.05). Conclusion: Within the limitations of the present in vitro study, it was concluded that 1% CHX gel application did not adversely affect the shear bond strengths of dentin-bonding agents.Öğe Effect of Different Restorative Materials on Microleakage of Ozone Gas and Traditional Cavity Disinfectant Applied Teeth(Taylor & Francis Inc, 2019) Cellik, Omer; Bahsi, EmrullahThe aim of this in vitro study is to investigate the effects of ozone and conventional cavity disinfectant on microleakage at the cavities which are restorated with different restorative materials. Ninety human molar teeth were used in this study. Black V cavities are prepared on buccal surfaces of teeth. Teeth are divided to 3 groups which contains 30 teeth. Group 1: ozone applied; Group 2: 2% chlorhexidine applied; Group 3: any disinfectant is not applied. And then all groups are divided to three subgroups. All subgroups are restored with silorane, ormocer, and traditional composite according to the manufacturer's directions. Sections were examined under a microscope. Occlusal and gingival microleakage values by a separate researcher and scores were recorded. Statistically results were reviewed with ANOVA and Kruskal-Wallis Tests. Statistically significant difference of microleakage between cavity disinfectant and control groups' occlusal and gingival lines was not found (p > 0.05). There was no differences at occlusal lines of composite subgroups (p > 0.05) but also significant difference at gingival lines was found (p < 0.05). Statistically significant difference was found among the composite materials, between chlorhexidine and control groups' gingival lines. The most successful results at gingival lines were found with silorane.Öğe Effect of the different finishing and polishing procedures on the surface roughness of three different posterior composite resins(Wiley-Hindawi, 2016) Şahbaz, Cafer; Bahsi, Emrullah; İnce, Bayram; Bakır, Elif Pınar; Çellik, ÖmerFinishing and polishing techniques have great importance on the long term success and aesthetics of the composite restorations. In this study it was aimed to examine the effect of three different posterior composites on surface texture with various finishing and polishing procedures. Three different posterior composites, Filtek P60, Clearfil Majesty Posterior and Cavex Quadent Posterior Dense, and three different finishing and polishing procedures diamond finishing burs, tungsten carbide burs and Sof-Lex discs were used in the study. The specimens were 5mm in diameter and 2mm in height. The surface roughness was measured at three seperate points with a profilometer device and the Ra values were recorded. A one-way analysis of variance (ANOVA) and Kruskal-Wallis variance analysis was applied for statistical analysis and p<0.05 was accepted significant. No statistically significant differences were found between the composite resins with respect to surface roughness (p>0.05). A statistically significant difference was found between the groups of diamond, carbide, and Sof-Lex groups (p<0.05). Sof-Lex polishing system was more successful than the diamond and carbide burs in the finishing and polishing procedures of composites. SCANNING 38:448-454, 2016. (c) 2016 Wiley Periodicals, Inc.Öğe Effects of Chlorhexidine Gluconate and Ozone on Bond Strength(Univ Indonesia, Fac Dentistry, 2018) Yavuz, Yasemin; Bahsi, EmrullahObjective: To examine the effects of chlorhexidine gluconate (Chx) and ozone on the bond strength of currently used restorative materials to dentin. Methods: Ninety third molar teeth were randomly divided into three groups of 30 each. Samples in Groups 1 and 2 were disinfected with Chx and ozone, respectively, whereas those in Group 3 were not disinfected (controls). Subsequently, the samples in all three groups were further divided into three subgroups of 10 teeth each and restored with Filtek Silorane (a), Gradia Direct (b), or Quixfil (c). Shear force was applied to the samples at 1 mm/min until breaking point. Fracture types were determined by examining the broken surfaces under a stereomicroscope. Results: No significant differences in bond strengths were noted between the Chx and control groups. However, the bond strengths in the ozone subgroups were found to be significantly lower than that of the control subgroups (p < 0.05). Adhesive type fractures were observed in majority of the treatment groups. Conclusion: As Chx did not affect the shear bond strength of the restorative materials, it may be considered for use as a cavity disinfectant before restoration; conversely, ozone should be used with caution for cavity disinfection.Öğe Treatment of an amelogenesis imperfecta with restorations prepared using a modified clear matrix technique(Wiley, 2010) Ozer, Senem G. Yigit; Bahsi, EmrullahThe rehabilitation of a patient with amelogenesis imperfecta (AI) from both functional and esthetic standpoints represents a challenge. A number of treatment options have been proposed. Recently, the use of adhesive restorations has gained popularity because of the improved physical properties of these materials. This article describes a treatment with direct resin composite for the restoration of teeth affected by the hypomature type of AI. A modified clear matrix technique was used during the preparation and restoration process. The use of the technique provides clinicians with reduced chair time, and the matrix can be repeated when needed; restorations can be performed relatively quickly with a minimal post-operative finishing process. This article highlights the use of direct-bonded resin composites providing satisfactory esthetics and function in restoring AI-affected teeth.
