Effect of Metal Framework Incorporation and Locator Processing Technique on Initial and Long Term Overdenture Retention
Abstract
Statement of the problem. The indirect technique of processing overdenture Locator housings can cause inaccuracy in their positioning, leading to decreased overdenture retention and more rapid wear of the male retention element. The purpose of this in vitro study was to assess initial overdenture retention and change in retention over three months of simulated use in overdentures fabricated with direct processing of Locator housings, indirect processing without a metal framework, and indirect processing with a metal framework. Material and Methods. Forty-five overdentures were fabricated from Microfit VR-90 acrylic denture resin. Fifteen overdentures utilized direct processing of Locator housings (Group DP), 15overdentures utilized indirect processing of Locator housings without a metal framework (Group IP), and 15 overdentures utilized indirect processing of Locator housings with a metal framework(Group M). Samples were then subjected to 270 removal-insertion cycles on a titanium model with2 locator abutments, simulating 3 months of use, assuming three daily removals and insertions of the overdenture for hygiene purposes. The mean initial work needed to dislodge each group was calculated, followed by calculations of linear regression of change in work needed to dislodge overdentures over 270 cycles. Data were analyzed using the Shapiro-Wilk and ANOVA tests(=.05).Results. All three groups of overdentures were found to have statistically insignificant differences in initial work required for overdenture removal (p>.05). Average initial work required to remove group M was 37.147 J, group DP was 44.581 J, and group IP was 43.175 J. The rate of change in work required to dislodge the overdentures over three months of service was not significantly different amongst the three overdenture groups (p<.05).
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 13, 2019
- Accession Number
- AD1128058
Entities
People
- Cynthia Aita-holmes
- Kellie S. O'keefe
- M. H. Parker
- Walter Dimalanta
Organizations
- Charlie Norwood VA Medical Center
- Uniformed Services University of the Health Sciences