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REVIEW ARTICLE
Year : 2013  |  Volume : 3  |  Issue : 2  |  Page : 687-694

Influence of polymerization shrinkage on denture base distortion - A systematic review


1 Professor, Department of Prosthodontics, Saveetha Dental College, Chennai, India
2 PG Trainee, Department of Prosthodontics, Saveetha Dental College, Chennai, India
3 Reader, Department of Prosthodontics, Saveetha Dental College, Chennai, India
4 Professor and Head, Department of Prosthodontics, Saveetha Dental College, Chennai, India
5 Senior Lecturer, Department of Prosthodontics, Saveetha Dental College, Chennai, India

Correspondence Address:
Dr. M Dhanraj
Professor, Department of Prosthodontics, Saveetha Dental College, Chennai
India
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Source of Support: None, Conflict of Interest: None


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Statement of the Problem: Polymethylmethacrylate denture bases undergo distortion due to polymerization shrinkage due to several factors. Processing techniques used for fabrication of denture bases significantly influence the degree of denture base distortion. The comprehensive role of processing techniques inducing denture base distortion remains unclear hence needed to be investigated further. Aim: To evaluate the degree of distortion induced due to polymerization shrinkage in tissue supported maxillary and mandibular complete dentures processed with injection and compression moulding techniques. Search Methodology: An electronic search was launched with Pubmed, Cochrane, Science Direct databases to screen for articles discussing denture base processing techniques using suitable keywords, finally 9 titles were selected for data extraction. The extracted data was tabulated and analyzed statistically. Results: The linear and horizontal distortion present in denture bases processed with injection moulding techniques are 0.494 ± 0.110 mm and 0.482 ± 0.252 mm respectively and with compression moulding techniques are 0.526 ± 0.061 mm and 0.556 ± 0.056 mm respectively. Conclusion: The current systematic review inferred that Injection moulded tissue supported complete dentures undergo less distortion than the conventional compression moulded dentures. Polymerization shrinkage is manifested in a lesser proportion in denture bases processed with injection moulding than the compression moulding technique.


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