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ORIGINAL RESEARCH
Year : 2016  |  Volume : 8  |  Issue : 9  |  Page : 911-915

Dimensional Changes in Microwave Processed Acrylic Resin and Conventional Heat Resin Cured by Water Bath and Microwave Energy - An In Vitro Study


1 Professor, Department of Prosthodontics, Faculty of Dental Science, SGT University, Gurgaon, Haryana, India
2 Associate Professor, Department of Dental Surgery, GSVM Medical College, Kanpur, Uttar Pradesh, India
3 Reader, Department of Prosthodontic, Modern Dental College and Research Centre, Indore, Madhya Pradesh, India
4 Senior Lecturer, Department of Prosthodontic, Bhabha College of Dental Science, Bhopal, Madhya Pradesh, India
5 Reader, Department of Conservative Dentistry, Faculty of Dental Science, SGT University, Gurgaon, Haryana, India
6 Post-graduate Student, Department of Prosthodontics, Faculty of Dental Science, SGT University, Gurgaon, Haryana, India

Correspondence Address:
Sumit Singh Phukela
4 Gopi Nath Bazar, Delhi Cantt 10, New Delhi - 110 010, India

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Source of Support: None, Conflict of Interest: None


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Background: Poly-methyl-methacrylate (PMMA) and microwaveable acrylic resin are used for complete denture and removable partial denture services. This study was conducted to comparatively evaluate dimensional changes in microwave processed acrylic resin and in conventional heat polymerized resin cured by water bath and microwave energy. Materials and Methods: A total of 30 maxillary denture bases (3 mm thick) were made on cast in our study. These samples were demarcated into 3 groups. Group 1: Control, conventional heat cure PMMA cured by water bath method; Group 2 denotes conventional heat cure PMMA cured by microwave energy (500 W for 3 min); Group 3 denotes microwave acrylic resin cured by microwave energy (500 W for 3 min). After polymerization of test samples, the base/cast sets were cut transversally in the posterior palatal seal area. The measurements were made at the right marginal limit, left marginal limit, right ridge crest, left ridge crest, and the palatal midline. Stereomicroscope used to see the gaps between the casts and denture base. The data were collected and statistically analyzed. Results: The highest dimensional inaccuracies were seen in conventional heat cure PMMA samples cured by microwave energy (500 W for 3 min), and lowest dimensional changes were seen with the microwaveable acrylic resin samples cured by microwave energy (500 W for 3 min). Conclusion: Within the limitations of this study, it can be concluded that the highest dimensional stability is seen in microwaveable acrylic resin cured by microwave energy (500 W for 3 min) and lowest dimensional stability in conventional heat cure PMMA samples cured by microwave energy (500 W for min).


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