International Journal of Prosthodontics and Restorative Dentistry

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VOLUME 8 , ISSUE 4 ( October-December, 2018 ) > List of Articles

ORIGINAL ARTICLE

Comparison of Water Conditioning Effects on Hardness and Dimensional Stability of Methyl Methacrylate and Polyamide Denture Base Materials

Sahar Elkholy

Keywords : Dimensional stability, Hardness, Polyamide, Poly-(methyl methacrylate), Water conditioning

Citation Information : Elkholy S. Comparison of Water Conditioning Effects on Hardness and Dimensional Stability of Methyl Methacrylate and Polyamide Denture Base Materials. Int J Prosthodont Restor Dent 2018; 8 (4):114-119.

DOI: 10.5005/jp-journals-10019-1218

License: CC BY-NC 4.0

Published Online: 01-12-2018

Copyright Statement:  Copyright © 2018; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Aim: To evaluate the influence of water conditioning on the hardness and dimensional stability of polyamide denture material. Materials and methods: The samples were conditioned in a water bath according to values of temperature (4° C and 43° C) and time (700 hours). To evaluate the hardness test, samples were fabricated from polyamide and heat cured acrylic resin materials and was divided into control, cold conditioning and hot conditioning groups and hardness were measured for all groups. For dimensional stability test, forty denture bases were divided into cold conditioning and hot conditioning groups. The gaps between the denture base and the cast were measured. Results: The hardness of polyamide denture material was significantly decreased after hot water conditioning. Heat cured acrylic resin showed a significant increase in dimensional changes regarding cold water conditioning test. Conclusion: Water conditioning at 43° C could decrease hardness and increase the flexibility of polyamide denture material. Water conditioning at 4° C could increase in dimensional instability of heat cure poly (methyl methacryolate) (PMMA) denture material. Clinical significance: Use of dimensionally stable denture materials under the hot and cold condition are very important to retain the denture.


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