Fazal Ghani.
Investigations into some factors affecting denture base retention in vivo.
J Coll Physicians Surg Pak Jan ;12(9):513-7.

Objective: To investigate the influence of the palatal shapes and morphology, degree of denture base fit, fitting surface texture, denture base material, time, day and of exercise on denture base retention. Design: A descriptive study. Place and Duration of Study: The study, spanning over a period of 4 years, was conducted at the Dental School of the University College London (UCL). Patients and Methods: Dentate subjects from among the staff participated in the study. The test plates, in each case, were basically mucosa borne palatal plates constructed in a standardized manner. With test plate in the subject`s mouth, its retention was measured under various test conditions using the methodology and equipments previously developed and used for the purpose. Retention forces at the required test stages were measured by using the UCL retentiometer. Results: Not-withstanding the within and between subjects variations in retention, forces for the well-fitting plates were significantly higher than those with the ill-fitting plates (P<0.001). Analyses of the data showed that retention of the plate was significantly correlated only to the surface area of the palate in contact with the appliance. There were no correlations between the other parameters of the palate and retention, which approached a level of significance. Acrylic plates with air-particle abraded (sandblasted) fitting surface exhibited the highest retention forces than acrylic plates with fitting surface either made against a model (cast) coated with a separating liquid or tin-foil separator. In contrast, cast cobalt-chromium plates were the least retentive among the test plates studied. Retention forces recorded at different times of the same and on different days exhibited no significant variations. Similarly, the effect of a standard exercise had no influence on denture retention. Conclusion: Denture base material, degree of fit, fitting surface texture and surface area of the appliance in contact with the palate were found as important factors affecting denture retention. In addition, light and uniform air-particle abrasion of the fitting surface further improved the retention of the test plate.

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