IADR Abstract Archives
Evaluation of CAD/CAM Polymers for Digitally Fabricated Complete Dentures
Objectives: To evaluate the mechanical properties of three prepolymerized poly(methyl methacrylate) (PMMA) resins used in the manufacturing of CAD/CAM milled complete dentures (CDs), as well as two denture base polymers used for conventionally manufactured CDs.
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 control (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=0.05). Statistical software (IBM SPSS Statistics v24; IBM Corp) was used for conducting all analyses.
Results: Material type and storage had a significant influence on the flexural strength, nanohardness, elastic modulus and surface hardness of the materials investigated (p<0.001). The post hoc Scheffe test for flexural strength revealed a non-significant difference on the interaction 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 non-significant interaction in terms of surface hardness was also found between IvoBase CAD and Palapress (p=0.575).
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.
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 control (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=0.05). Statistical software (IBM SPSS Statistics v24; IBM Corp) was used for conducting all analyses.
Results: Material type and storage had a significant influence on the flexural strength, nanohardness, elastic modulus and surface hardness of the materials investigated (p<0.001). The post hoc Scheffe test for flexural strength revealed a non-significant difference on the interaction 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 non-significant interaction in terms of surface hardness was also found between IvoBase CAD and Palapress (p=0.575).
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.