Browsing by Author "Kavut, Idris"

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The Effect of Amine-Free Initiator System and Polymerization Type on Long-Term Color Stability of Resin Cements: an In-Vitro Study
(Bmc, 2022) Kavut, Idris; Ugur, Mehmet
Background This in vitro study evaluated the effect of amine-free initiator system and polymerization type on long-term color change of amine-free light-cure and dual-cure resin cements. Methods Sixty disk-shaped specimens (10 x 1 mm) were prepared from six different amine-free resin cements; NX3 Nexus light-cure (LC) and dual-cure (DC), Variolink Veneer (LC) and Variolink II (DC), Relyx Veneer (LC) and Rely X Ultimate (DC). A feldspathic porcelain specimen (12 x 14 x 0.8 mm) was obtained from a CAD/CAM block (Cerec Blocks; Sirona Dental Systems GmbH, Bensheim, Germany) for color testing. The feldspathic specimen was placed on the resin cement disk and all measurements were performed without cementation. A spectrophotometer was used for color measurements. Specimens were subjected to thermal aging (5 degrees C and 55 degrees C; 5000 and 20,000 cycles). Specific color coordinate differences (Delta L, Delta a, and Delta b) and the total color differences (Delta E-00) were calculated after immersion in distilled water for different periods. Normality of data distribution was tested by using the Kolmogorov-Smirnov test. Data were statistically in a model of repeated measures, using multivariate tests and Tukey's multiple comparison tests at a significance level of p < 0.05. Results increment E-00 values of resin cements were influenced by cycle periods, significantly (p < 0.05). The highest Delta E00 values for long term were obtained in the NX3 (DC) (3.49 +/- 0.87) and the lowest in the NX3 (LC) (1.41 +/- 0.81). NX3 (LC), Variolink (DC), RELY X (LC) resin cements showed clinically acceptable color change after long-term aging ( increment E-00 < 1.8). Conclusion Light-cure resin cements should be preferred for long-term color stability of full ceramic restorations.
Effect of Ceramic Primers With Different Chemical Contents on the Shear Bond Strength of Cad/Cam Ceramics With Resin Cement After Thermal Ageing
(Bmc, 2023) Ugur, Mehmet; Kavut, Idris; Tanrikut, Ozgur Ozan; Cengiz, Onder
Background This study evaluated the effect of ceramic primers containing 10-methacryloyloxydecyl phosphate (10-MDP) and beta-methacryloxypropyl trimethoxysilane (gamma-MPTS) agents on the shear bond strength (SBS) of CAD/CAM ceramics with different chemical structures and resin cement. Methods A total of 640 CAD/CAM ceramic specimens were obtained from Vita Mark II (VM), IPS E.max CAD (EM), Vita Suprinity (VS) and Vita Enamic (VE). The specimens were divided into two groups: etched with hydrofluoric acid (HF) and unetched. Each group was treated with a different ceramic primer (Clearfil Ceramic Primer Plus, G-Multi Primer and Monobond S), except for an untreated group (n = 10). After ceramic primers and resin cement were applied to each ceramic surface, half of the specimens were thermally aged at 10,000 cycles, 5-55 +/- 1 degrees C, with a dwell time of 30 s. The SBS was tested with a universal testing machine at a 0.5 mm/min crosshead speed. Data were analysed by using statistical software (SPSS 20). Normal data distribution was checked with the Shapiro-Wilk test. Three-way ANOVA was used to analyse the difference between the numeric data of the HF etched and thermally aged groups. A post hoc Tukey test was applied in the paired comparison of significant difference. The statistical significance level was accepted as p < 0.05. Results The highest SBS values were obtained in the HF etched G-Multi primer applied nonaged EM group (28.3 +/- 2.62 MPa), while the lowest values were obtained in the nonetched and thermally aged EM group that received no treatment (2.86 +/- 0.04 Mpa). The SBS significantly increased in all specimens on which the ceramic primer was applied (p < 0.001). Thermal ageing had a significant negative effect on the SBS values in all groups (p < 0.001). Conclusion The positive combined effects of the 10-MDP and gamma-MPTS agents resulted in a significant increase in the bonding strength of the resin cement to the CAD/CAM ceramics. In addition, the increase in the amount of inorganic filler provided a favourable effect on durable adhesion.
The Effect of Dentin Treated With Calcium Phosphate Desensitizer on Shear Bond Strength With Different Resin Cement: an in Vitro Study
(Sage Publications india Pvt Ltd, 2022) Kavut, Idris; Ugur, Mehmet
Aim: The aim of this study was to evaluate the effect of calcium phosphate based desensitizing agent on shear bond strength of self-etch/adhesive resin cements to dentin. Materials and Methods: Eighty dentin specimens were prepared from freshly extracted human third molar teeth and were classified, randomly (n = 20). Half of groups were treated with calcium phosphate based Teethmate Desensitizer and then Panavia V5, RelyX Ultimate (containing self-etch primer), Panavia SA, and RelyX U200 self-adhesive resin cements were luted to all dentin surfaces. All specimens were stored in an incubator at 37 degrees C for 24 h. Shear bond strength was tested by a universal test machine at a 0.5 mm/min crosshead speed. The data were analyzed with a statistical program. Two-way ANOVA was used for statistical differences (P<.05). Dentin surfaces were examined with scanning electron microscopy (SEM) at x5000 and x10000 magnifications. Results: The higher shear bond values were observed in the groups with Teethmate Desensitizer applied and cemented with self-etch (16.05 +/- 6.24 and 14.73 +/- 4.75), whereas the lowest bonding values were observed in the groups with self-adhesive resin cement without Teethmate Desensitizer (3.73 +/- 0.77 and 5.85 +/- 4.19; P<.001). As the main effect of the treatment, the bond strength was 9.39 +/- 6.04 in the control group, whereas it was 13.49 +/- 5.44 in the Teethmate applied groups (P<.05) Conclusions: Calcium phosphate desensitizer did not adversely effected shear bond strength of self-etch/adhesive resin cements to dentin. It even significantly increased the shear bond strength of self-adhesive resin cements.
Effects of Desensitizers, Temporary Cements, and Dentin Cleaning Methods on the Bond Strength of Self-etch/Adhesive Resin Cements To Dentin: an in Vitro Study
(Sage Publications india Pvt Ltd, 2022) Ugur, Mehmet; Kavut, Idris; Kulunk, Safak; Akdeniz, Mehmet Serif; Tanrikut, Ozgur Ozan
Aim: The aim of this study was to evaluate the effect of desensitizer, temporary cements, dentin cleaning methods on shear bond strength (SBS) of self-etch and self-adhesive resin cements to dentin. Materials and Methods: Four hundred eighty buccal or lingual/palatine coronal portions of human molar teeth were mounted in the acrylic blocks. Teeth surfaces were prepared until the dentin was exposed. Specimens were divided into four groups. One group separated as control and three groups of teeth were treated with a desensitizing agent containing calcium-phosphate desensitizer (Teethmate Desensitizer, TMD), resin-based self-reinforcing monomer (Shield Force Plus, SFP) and 2-hydroxyethyl methacrylate and glutaraldehyde (Gluma Desensitizer). Two different temporary cement containing calcium hydroxide (Dycall) and zinc oxide based (Rely X Temp NE) temporary cement were applied to the dentin surfaces. Temporary cement was removed with one of three cleansing techniques: 2% chlorhexidine digluconate and glass particles containing agent (Consepsis Scrub), cleansing bur (OptiClean), and intra/extracoronal rotary brush (Starbrush). All groups were further divided into two cementation subgroups (Panavia V5 and Panavia SA). The SBS (MPa) was measured using a universal testing machine at 0.5 mm/min crosshead speed. The data were analyzed statistically with a four-way analysis of variance and Tukey's Honest Significant Difference test (alpha = 0.05). Results: Although SFP showed higher SBS, there was no statistically significant difference between other groups (P > .05). There were no significant differences between temporary cements (P > .05). OptiClean rotary bur showed higher mean SBS values in all groups. The dual-polymerized Panavia V5 showed the highest SBS values in all groups (P < .05). Conclusion: Cleaning of dentin surface from temporary cement remnants with a silicon bur and dual-cure resin cement showed the highest bond strength values.