CAD/CAM Resin-Based Composites for Use in Long-Term Temporary Fixed Dental Prostheses.

Franziska Hensel,Hans-Martin Doerfler,Sebastian Hahnel,Martin Rosentritt,Andreas Koenig,Florian Fuchs

doi:10.3390/polym13203469

Abstract

The aim of this in vitro study was to analyse the performance of CAD/CAM resin-based composites for the fabrication of long-term temporary fixed dental prostheses (FDP) and to compare it to other commercially available alternative materials regarding its long-term stability. Four CAD/CAM materials [Structur CAD (SC), VITA CAD-Temp (CT), Grandio disc (GD), and Lava Esthetic (LE)] and two direct RBCs [(Structur 3 (S3) and LuxaCrown (LC)] were used to fabricate three-unit FDPs. 10/20 FDPs were subjected to thermal cycling and mechanical loading by chewing simulation and 10/20 FDPs were stored in distilled water. Two FDPs of each material were forwarded to additional image diagnostics prior and after chewing simulation. Fracture loads were measured and data were statistically analysed. SC is suitable for use as a long-term temporary (two years) three-unit FDP. In comparison to CT, SC featured significantly higher breaking forces (SC > 800 N; CT < 600 N) and the surface wear of the antagonists was (significantly) lower and the abrasion of the FDP was similar. The high breaking forces (1100–1327 N) of GD and the small difference compared to LE regarding flexural strength showed that the material might be used for the fabrication of three-unit FDPs. With the exception of S3, all analysed direct or indirect materials are suitable for the fabrication of temporary FDPs.

Highlights

Temporary fixed dental prostheses (FDPs) are essential for the success of prosthetic treatments
Temporary FDPs fabricated using the direct technique are recommended for a wearing time between one and three months, while temporary FDPs fabricated using indirect techniques can be in service for up to two years [5,6]
For FDPs fabricated from CT and Grandio disc (GD), fracture loads were significantly higher after chewing simulation and thermocycling (p < 0.001 and p < 0.05, respectively) (Table 4)

Summary

Introduction

Temporary fixed dental prostheses (FDPs) are essential for the success of prosthetic treatments. In cases with extended restorations, their low density and low weight improve the wearing comfort for the patients Due to their low modulus of elasticity and brittleness, polymer-based CAD/CAM materials have favourable properties for the treatment of patients with bruxism, even if it is not commonly included in the indications [14]. While both materials are approved for the fabrication of temporary FDPs, their properties might allow application in definitive restorations. A CAD/CAM ceramic (LE) for permanent application was used for reference purposes (Table 2)

Experimental Procedure

Results

Surface Analyses

Microstructure

Surface Properties

Conclusions