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Effect of Different Acidic Agents on Surface Roughness of Feldspathic Porcelain

Open Journal of Stomatology 2016年第3期6卷 90-95页

作者： Zeynep Yesil Duymus Alper Ozdogan hamza ulu Department of Prosthodontics Faculty of Dentistry Recep Tayyip Erdogan University Rize Turkey Department of Prosthodontics Faculty of Dentistry Atatürk University Erzurum Turkey

Objectives: The aim of this study was to evaluate the effect of different acidic agents on surface roughness of feldspathic porcelain. Materials and Methods: In this study, totally 60 disc shaped Noritake and Ceramco 3 feldspathic porcelain were used. The samples were divided into five groups and immersed in five acidic agents (coke, orange juice, lemonade, mineral water and black-carrot juice). After 168 hours, the specimens were evaluated surface roughness with profilometer. Results: The results showed that the highest surface roughness value (4.46 ± 2.9 μm) was identified in lemonade at Noritake porcelain and the lowest surface roughness value (1.06 ± 0.56 μm) was identified in mineral water at Ceramco 3 porcelain. The result of two-way analysis of variance test showed that there were no statistically significant differences between acidic agents on surface roughness of feldspathic porcelain (p > 0.05). Conclusions: The obtained data presented that the acidic drinks affected the surface roughness of feldspathic porcelain.

关键词： Feldspathic Porcelain Surface Roughness Acidic Agents

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Evaluation the Vickers Hardness of Denture Base Materials

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Open Journal of Stomatology 2016年第4期6卷 114-119页

作者： Zeynep Yesil Duymus Alper Ozdogan hamza ulu Ozlem Ozbayram Department of Prosthodontics Faculty of Dentistry Recep Tayyip Erdo?an University Rize Turkey Department of Prosthodontics Faculty of Dentistry Atatürk University Erzurum Turkey

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. To-tally 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 one-way 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.

关键词： Hardness Denture Bases Polyamide

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Color Changes of Polyamid and Polymetyhl Methacrylate Denture Base Materials

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Open Journal of Stomatology 2014年第10期4卷 489-496页

作者： Nurdan Polat Sagsoz Nuran Yanikoglu hamza ulu Funda Bayindir Prosthodontics Department School of DentistryAtaturk UniversityErzurumTurkey

Aim: Both conventional and flexible resins may show color alteration due to intrinsic and extrinsic factors. The aim of this study was to evaluate the color changes of the polyamid and heat polymerized acrylic denture base materials in storage of different staining solutions. Methods: Two denture base materials were used in this study. The speciemens were stored in two staining solutions (tea, coffee), distilled water and denture cleaner. For each group, 14 speciemens (25 × 15 × 2.5 mm) were prepared. The color of speciemens was measured using a colorimeter according to the CIE L*a*b* color scale. The color changes of speciemens were evaluated before and after 7 and 30 days. All data recorded were taken by the same investigator to minimize inconstancy of technique. The data were analyzed statistically by repeated measures analysis of variance and Tukey honestly significant difference multiple comparison tests. It was found no statistically significant difference between solutions (P > 0.05). Results: Polyamid denture base resin displayed the greatest colour change when compared to polymetyhl methacrylate denture base resin (P < 0.001). Polyamid material indicated the highest value (ΔE: 7.28) in coffee solution for 7 days. Significance: The colour stability of polymetyhl methacrylate denture base resin is greater than polyamid denture base resin.

关键词： Color Stability Polyamid Polymetyl Methacrylate Denture Base Solution

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