Saad, Y., Abdelhamid, A., ElShabrawy, S. (2018). LABORATORY EVALUATION OF PRE-POLYMERIZED DENTURE BASE MATERIAL USED FOR CAD/CAM COMPLETE DENTURE MANUFACTURING. test, 43(3), 94-101. doi: 10.21608/adjalexu.2018.58006
Yusra M. Saad; Ahmed M. Abdelhamid; Sonia M. ElShabrawy. "LABORATORY EVALUATION OF PRE-POLYMERIZED DENTURE BASE MATERIAL USED FOR CAD/CAM COMPLETE DENTURE MANUFACTURING". test, 43, 3, 2018, 94-101. doi: 10.21608/adjalexu.2018.58006
Saad, Y., Abdelhamid, A., ElShabrawy, S. (2018). 'LABORATORY EVALUATION OF PRE-POLYMERIZED DENTURE BASE MATERIAL USED FOR CAD/CAM COMPLETE DENTURE MANUFACTURING', test, 43(3), pp. 94-101. doi: 10.21608/adjalexu.2018.58006
Saad, Y., Abdelhamid, A., ElShabrawy, S. LABORATORY EVALUATION OF PRE-POLYMERIZED DENTURE BASE MATERIAL USED FOR CAD/CAM COMPLETE DENTURE MANUFACTURING. test, 2018; 43(3): 94-101. doi: 10.21608/adjalexu.2018.58006

LABORATORY EVALUATION OF PRE-POLYMERIZED DENTURE BASE MATERIAL USED FOR CAD/CAM COMPLETE DENTURE MANUFACTURING

Alexandria Dental Journal
Article 16, Volume 43, Issue 3, December 2018, Pages 94-101    PDF (507.34 K)
Document Type: Original Article
DOI: 10.21608/adjalexu.2018.58006
Authors
Yusra M. Saad1; Ahmed M. Abdelhamid2; Sonia M. ElShabrawy3
1BDS and Demonstrator, Removable prosthodontic department, Faculty of Dentistry, Benghazi University, Libya
2Professor of Prosthodontics, Faculty of Dentistry, Alexandria University, Egypt
3Professor and Head of Biomaterial, Faculty of Dentistry, Alexandria University, Egypt
Abstract
INTRODUCTION: CAD/CAM denture base materials are milled from pre-polymerized pucks of resin that are highly condensed. So, they provide no polymerization shrinkage eliminating its subsequent disadvantages. This technology offered improved fit, strength properties and more bio-hygienic denture bases compared with conventional processing of the denture base material. OBJECTIVES: The aim of the study was to evaluate the physico-mechanical properties of CAD/CAM denture base material and the effect of thermo-cycling on it compared with the conventional one. MATERIALS AND METHODS: The study was conducted on two parallel groups, divided according to the denture material used. Group (1) conventional PMMA (control group), group (II) CAD/CAM PMMA (study group) of 40 specimens each (16 for impact strength, 16 for flexural strength, 8 for surface roughness and grinded powder form both materials for residual monomer test). Each group was divided into 2 sub-groups: (A) No thermo-cycling and (B) Thermo-cycling, then subjected to 4 different tests, impact strength, flexural strength, surface roughness and residual monomer tests. Data were collected, tabulated and statistically analyzed. Significance level was set at 5%. Bar charts were used for graphical presentations. RESULTS: Our study revealed a highly statistically significant decrease in residual monomer of CAD/CAM PMMA material in both conditions before and after thermo-cycling when compared to conventional PMMA material, which therefore leads to enhanced impact strength and significantly reduced surface roughness after heat treatment. On the other hand, also a highly significant reduction of its flexural strength after thermocycling has been observed. CONCLUSIONS: CAD/CAM dentures with lower amount of methacrylate monomer exhibit more favourable physico-mechanical properties and they have a long-term biocompatibility even with thermal changes making them a more satisfactory as a denture base material for edentulous patients.
Keywords
CAD/CAM; flexural strength; impact strength; PMMA; Residual monomer; Surface roughness
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