Assessment of the fitness of removable partial denture frameworks manufactured using additive manufacturing/selective laser melting

May 23, 2022

Selma A. Saadaldin (1), Amin S. Rizkalla (2), Ezahraa A. Eldwakhly (3) (4), Mai Soliman (4), Alhanoof Aldegheishem (4)
Materials Express. Volume 12, Number 5, pages 735-742 (May 2022). DOI:


3D printing, additive manufacturing micro-CT, fitness accuracy, RPD frameworks, selective laser melting


The study compared the fitness accuracy of digitally produced removable partial denture frameworks using 3D printing selective laser melting technology. Three groups were fabricated; the first group where the frameworks were produced digitally through digital designing and then the frameworks were printed by selective laser melting additive manufacturing (3DP-G1). The second frameworks groups were produced by the lost wax/casting method (C-G2) and the third group was produced by scanning wax-up of the framework and then printed as in the first group (SP-G3). A total of 6 frameworks were produced from each group. Micro-CT images were used to investigate spaces under the frameworks seated on the master casts at five specified locations. Finally, spaces at the same locations were measured by using light-body polyvinyl siloxane impression materials. There was no significant difference among the spaces calculated underneath the 18 frameworks for the three various groups at a significance level of (α = .05) either at the CT-scan images or by using the silicone registration materials. Removable partial denture frameworks that were produced by 3D printing technology using selective laser melting additive manufacturing have a high level of fitness accuracy comparable to the ones produced by the lost wax/casting method.

How Our Software Was Used

A deep learning model was trained for denoising in Dragonfly. In addition, deviations between FWs and their corresponding master casts were measured in Dragonfly.

Author Affiliation

(1) Prosthodontics Division, Schulich School of Medicine and Dentistry, Western University, N6A 5C1, Canada
(2) Schulich School of Medicine and Dentistry, Department of Chemical and Biochemical Engineering, Western University, N6G 1G8, Canada
(3) Department of Fixed Prosthodontics, Faculty of Dentistry, Cairo University, Cairo, 4240310, Egypt
(4) Clinical Dental Sciences Department, College of Dentistry, Princess Nourah bint Abdulrahman University, 13414, Saudi Arabia