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The aim of this study was to evaluate the Vickers Hardness of four different denture base materials. Four different denture base materials were used in this study: Heat-cured pink acrylic resin, self-cured acrylic resin, heat-cured clear acrylic resin and polyamide denture base materials. Totally 80 disc shaped samples which 2 mm thickness and 40 mm diameter were prepared. The samples were stored in distilled water after polished. Then, Vickers Hardness test was performed with TMTeck HV-1000B (200 gram at 15 second). The statistically analysis of obtained data was performed with use one-way analysis of variance test. The results showed that the highest Vickers Hardness value (18.57 HV) was identified in heat-cured (pink) acrylic resin, the lowest Vickers Hardness value (9.62 HV) was identified in polyamide denture base materials. The result of oneway analysis of variance test showed that there were statistically very highly significant differences between four denture base materials of Vickers Hardness (p < 0.001). The obtained data presented that the self-cured denture base acrylic resin was the hardnest denture base materials.

Objective: The aim of this study was to evaluate the effect of different bleaching agents on the surface roughness and color stability of feldspathic porcelain. Material and Methods: In this study, totally 40 disc-shaped Noritake and Ceramco 3 feldspathic porcelain and two bleaching agents (Opalescence Boost and Opalescence Pf) were used. Bleaching agents were exposed to specimens according to their protocol. Then, the surface roughness of the specimens was evaluated with profilometer and the color of the specimens was recorded by colorimeter. Statistical analysis of the data was performed with IBM SPSS Statistics 20. Results: The results showed that that there were statistically significant differences between the bleaching agents on the surface roughness of feldspathic porcelain (p<0.05). However, there were no statistically significant differences between the bleaching agents on the color stability of feldspathic porcelain (p>0.05). Conclusion: The obtained data presented that the bleaching agents increased the surface roughness and not affect the color stability of the feldspathic porcelain.KeywordsBleaching; Ceramic; Color; Surface roughness.

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ÖZAmaç: ÇalıĢmada, tutucu oluklu ve oluksuz akrilik rezin diĢlerin farklı kaide materyallerine bağlanma dayanımlarına tamir materyallerinin etkisinin incelenmesi amaçlanmıĢtır. Gereç ve Yöntem: ÇalıĢma kapsamında 30 adet ısı ile polimerize olan PMMA (polimetilmetakrilat) ve 30 adet poliamid olmak üzere toplam 60 adet disk Ģeklinde kaide materyali kullanıldı. Tamir materyali olarak; ısı ile polimerize olan PMMA, otopolimerize PMMA ve ıĢık ile polimerize olan tamir materyalleri kullanıldı. Ayrıca tutucu oluklu ve oluksuz olmak üzere toplam 60 adet akrilik rezin diĢ kullanıldı. Örneklerin bağlanma dayanımları universal test cihazında 1 mm/dk hızla ölçüldü. Verilerin istatistiksel değerlendirilmesi iki yönlü varyans analizi (ANOVA) testi ile yapıldı. Bulgular: Poliamid kaide maddesi grubunda; ıĢıkla polimerize olan tamir materyali grubunda bağlanma dayanımı, ısıyla polimerize olan PMMA ve otopolimerize PMMA gruplarından istatistiksel olarak anlamlı derecede farklı bulunmuĢtur (p<0.001). Isıyla polimerize olan PMMA grubunda; ıĢıkla polimerize olan tamir materyalinin en yüksek, otopolimerize PMMA' nın ise en düĢük bağlanma dayanımı değerlerine sahip olduğu görülmekle beraber gruplar arasında istatistiksel olarak anlamlı farklılık bulunamamıĢtır (p>0.05). Poliamid kaide materyalinin ıĢıkla sertleĢen tamir materyali alt grubu hariç bütün gruplarda diĢlerin oluklu veya oluksuz olmasının bağlanma dayanımını istatistiksel olarak anlamlı derecede etkilemediği görülmüĢtür (p>0.05). Sonuç: ÇalıĢma sonucunda, farklı tamir materyalleri akrilik diĢlerin farklı kaide materyallerine bağlanma dayanımlarını etkilediği anlaĢılmıĢtır. Anahtar Kelimeler: Poliamid, PMMA, ıĢıkla sertleĢen tamir materyali ABSTRACT Aim Aim: The objective of this study was to evaluate the effect of different repair materials on bond strength of denture teeth with/ without retention grooves to different base materials. Materials and Methods: 30 heat-cured PMMA and 30 polyamide; totally 60 disc-shaped base materials were used in this study. As repair materials; heatcured PMMA, autopolymerising PMMA, light-cured denture resin repair materials were used. Also 60 acrylic resin denture teeth with/ without retention groove were used. The bonding strengths of the samples were measured at a speed of 1 mm / min on a universal test machine. The data obtained were statistically analyzed with two way-ANOVA. Results: In polyamide denture base group, shear bond strengths of light cured denture resin repair material was statistically higher than heat-cured PMMA and autopolymerising PMMA groups (p<0.001). Similarly in heat-cured PMMA denture base group, shear bond strength of light cured denture repair material was higher than autopolymerising PMMA and heat-cured PMMA subgroups but there was no statistically significant difference between subgroups (p>0.05). Retention groove of denture teeth doesn't affect subgroup's shear bond strengths significantly except the polyamide base material repaired with light-cured denture resin (p>0.05). Conclusion:It was denture repair materia...