Clinical and Laboratory Evaluation of the Fit Accuracy of Metal Frameworks of Removable Partial Denture Fabricated from Two Different Pattern Materials

Abstract

Objective: The purpose behind this conducted study was clinical and laboratory assessments of the fit accuracies of cobaltchromium frameworks for removable partial dentures fabricated by traditional lost wax technique (TT), and the Light Cure Modeling Material Technique (LCMT). Materials and Methods: Sixteen healthy male Kennedy class I patients were selected from the specialty clinics in the Faculty of Dentistry, Taif University. The patients were divided into two Groups eight patients each; Group I: their metallic framework was constructed from the traditional lost wax patterns technique (TT), Group II: their metallic framework was fabricated by Light Cure Modeling Material Technique (LCMT). Conventional clinical and laboratory steps for construction of metallic partial denture were followed. The frameworks resulted from the two pattern materials were tested clinically and laboratory for fit accuracies and the results were statistically analyzed using the two-tailed t-tests. Results: Clinical results show an appropriate thickness of the impression materials and improved fit accuracy of the Light cure group in comparison to the traditional wax pattern group. Laboratory findings also showed that the Light cure group has significantly smaller mean gap values than the traditional wax pattern group. Conclusions: The fit accuracies of cobalt-chromium frameworks of removable partial denture fabricated from LCMT are better than that fabricated from TT.

Comparison between digital superimposition and microcomputed tomography methods of fit assessment of removable partial denture frameworks

“…2,[12][13][14] Other proposed direct analog methods, such as measuring with a calibrated wire scale or optical microscope, use low-resolution power or may lead to structural damage. 9,[18][19][20][21][22][23] A more detailed and objective evaluation can be obtained with an impression of the discrepancy followed by its quantitative analog measurement with calipers, a profile projector, or optical microscopy. 24,25 These sensitive techniques can lead to errors because of the low dimension and resilience of the impression materials.…”

Influence of Different Wax Hardening Agents on Surface Roughness of Refractory Cast Investment Materials

“…Ceresin wax melts at a point of 78C° Each specimen is dipping into the liquid melted wax until the surface of it covered entirely to close all the pores on the surface. [15,16].…”