Assessment of CAD-CAM polymers for digitally fabricated complete dentures (original) (raw)
2020, The Journal of Prosthetic Dentistry
Statement of problem. Information on the mechanical properties of the materials used for manufacturing computer-engineered complete dentures is scarce. Purpose. The purpose of this in vitro study was to evaluate the mechanical properties of 3 prepolymerized polymethyl methacrylate (PMMA) resins used in the fabrication of computeraided design and computer-aided manufacturing (CAD-CAM) milled complete dentures (CDs), as well as 2 denture base polymers used for conventionally fabricated CDs. Material and methods. Three CAD-CAM materials were evaluated: Degos Dental L-Temp, IvoBase CAD, and Zirkonzahn Temp Basic Tissue. Two materials used for conventionally manufactured dentures were also included as controls (Palapress and Paladon 65). Each material type was sectioned into bars for flexural strength, nanohardness, elastic modulus, and surface microhardness evaluation (n=8/material). Half of the specimens were stored in water for 30 days while the other half was dry-stored. A 2-way analysis of variance (ANOVA) was conducted to detect the effect of material and storage on the evaluated properties (α=.05). Linear contrasts were conducted to compare the differences among the 3 CAD-CAM materials and the conventional ones. Results. Material type and storage had a significant influence on the flexural strength, nanohardness, elastic modulus, and surface hardness of the materials investigated (P<.001). The post hoc Scheffé test for flexural strength revealed a nonsignificant difference in the interaction 3 between Degos L-Temp and Paladon (P=1.000). In terms of nanohardness, no difference was found when comparing Palapress with Paladon, as well as IvoBase CAD with Zirkonzahn Temp Basic (P=1.000). A nonsignificant interaction in terms of surface hardness was also found between IvoBase CAD and Palapress (P=.575). Conclusions. The tested materials showed variation in their mechanical properties with satisfactory behavior of the CAD-CAM materials. However, the results obtained when testing the materials used for the conventional fabrication of complete dentures suggest that their use might still be advisable. CLINICAL IMPLICATIONS The mechanical behavior of the materials used for the fabrication of computer-engineered complete dentures varies among different CAD-CAM systems. The results presented here should allow clinicians to make comparisons between the systems investigated with the aim of improving patient care and satisfaction, as well as achieving more predictable treatment outcomes.
Sign up for access to the world's latest research.
checkGet notified about relevant papers
checkSave papers to use in your research
checkJoin the discussion with peers
checkTrack your impact
Loading Preview
Sorry, preview is currently unavailable. You can download the paper by clicking the button above.