The results of this study indicated that transverse strength values of PMMA were within the ISO specification limit. Water storage time (50 hours, 30, 60, and 180 days) had no statistically significant effect on the transverse strength and deflection of PMMA. Acetal resin suffered from permanent deformation, but did not break in the three-point bending test. Acetal resin showed significant increase in deflection as the water storage time was increased from 50 hours to 180 days. All materials tested demonstrated deflection values in compliance with ISO specification No 1567.
Objective: The use of metal clasps especially in anterior region may cause aesthetic problems. Polyamide resin has been suggested as an alternative aesthetic denture clasp material. This study compared the retentive force and deformation of cobaltchromium and polyamide clasps after 36 months of simulated clinical use.
Materials and Methods:The retentive force for clasp removal was measured in distilled water using a custom-made apparatus with intervals corresponding to 0, 6, 12, 18, 24, 30 and 36 months of simulated clinical use. The distance (mm) between the retentive and reciprocal clasp tips was measured using a microscope before and after the insertion-removal procedures. Results: Significant difference was observed in distance between clasp tips for metal clasps between baseline and 36 months for molars and premolars (p<0.05). Likewise, retentive force showed significant difference (p<0.05) for cobalt-chromium between baseline and 36 months, while polyamide clasps did not show significant difference (p>0.05). Conclusion: Polyamide clasps could be alternative to metal clasps particularly on premolars with reliable retention and deformation.Amaç: Metal kroşelerin kullanımları özellikle anterior bölgede ise estetik problemlere yol açabilir. Poliamid rezinin yeni bir tipi alternatif estetik bir dental kroşe materyali olarak kullanılmaya başlamıştır. Bu çalışmanın amacı kobalt-krom kroşeler ile poliamid kroşelerin 36 aylık kullanım periyodu sonunda retantif kuvvetlerinin ve deformasyonlarının karşılaştırılmasıdır. Gereç ve Yöntemler: Kroşelelerin retantif kuvvetleri distile su içerisinde, özel tasarlanmış, yerleştirme-çıkarma mekanizmasıyla çalışan bir test aparatı yardımıyla ölçüldü. Klinik uygulamanın simülasyonu elde edilip bu aparat yardımıyla 0, 6, 12, 18, 24, 30 ve 36. aylarda ölçüm yapıldı. Yerleştirip çıkartma testinden önce ve sonra bir mikroskop yardımıyla kroşenin retantif ve resiprokal kolları arasındaki mesafe mm cinsinden ölçüldü. Bulgular: Otuz altı ayın sonunda premolar ve molarlarda metal kroşe tiplerinin kendi aralarındaki karşılaştırılmalarında resiprokal ve retantif kollar arasındaki mesafede
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.