Effect of different fabrication technique on the accuracy of maxillary Kennedy class II cases

Document Type : Original Article

Authors

1 Professor of Oral and Maxillofacial Prosthodontics Department Faculty of Dentistry Ain Shams University, Cairo, Egypt.

2 Professor of oral and maxillofacial prosthodontics department Faculty of Dentistry MSA University, Cairo, Egypt.

3 Post Graduate Student, Department of Removable Prosthodontics, Faculty of Dentistry, Ain Shams University, Egypt

Abstract

Abstract
Aim of this study: The aim of this study was to evaluate the accuracy of two different fabrication techniques (direct milling and indirect printing of castable resin then casted by lost wax technique) of Co-Cr frameworks using Geomagic software.
Material and methods: This in vitro study was applied on a ready-made (Kennedy class II modification 1) maxillary stone model used for educational purposes. The cast was scanned after modification, and a removable partial denture framework was digitally designed. Twelve frameworks were constructed and divided into two groups were defined: Group A: Six frameworks were printed with castable resin, then casted by the lost wax technique into Co-Cr frameworks; Group B: Six frameworks were milled directly from co-cr blank. Comparative 3D analysis was used to measure the accuracy of the fabricated frameworks using Geomagic Control X software. Student's t-test was used for comparing data. P value ≤ .05 was considered statistically significant.
Results: Regarding the accuracy of the occlusal rests, group B (milled) showed significantly higher accuracy than group A (printed). The same results were found regarding the 3D comparison of the overall accuracy, in which group B was significantly more accurate than group A.
Conclusion: Within the limitation of this study, it could be concluded that: Cobalt Chromium partial denture frameworks fabricated by direct milling technique are more accurate than frameworks fabricated by indirect 3D printing of resin framework then casted by lost wax technique.

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Egyptian Dental Journal
Volume 69, Issue 4 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
October 2023
Pages 2847-2853

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