Comparison of shear bond strengths of different types of denture teeth to different denture base resins

摘要

To determine the shear bond strengths of different denture base resins to different types ofprefabricated teeth (acrylic, nanohybrid composite, and cross-linked) and denture teeth produced by computeraided design/computer-aided manufacturing (CAD/CAM) technology. MATERIALS AND METHODS. Prefabricatedteeth and CAD/CAM (milled) denture teeth were divided into 10 groups and bonded to different denture basematerials. Groups 1-3 comprised of different types of prefabricated teeth and cold-polymerized denture baseresin; groups 4-6 comprised of different types of prefabricated teeth and heat-polymerized denture base resin;groups 7-9 comprised of different types of prefabricated teeth and CAD/CAM (milled) denture base resin; andgroup 10 comprised of milled denture teeth produced by CAD/CAM technology and CAD/CAM (milled) denturebase resin. A universal testing machine was used to evaluate the shear bond strength for all specimens. One-wayANOVA and Tukey post-hoc test were used for analyzing the data (α=.05). RESULTS. The shear bond strengths ofdifferent groups ranged from 3.37 ± 2.14 Mpa to 18.10 ± 2.68 Mpa. Statistical analysis showed significantdifferences among the tested groups (P.0001). Among different polymerization methods, the lowest values weredetermined in cold-polymerized resin.There was no significant difference between the shear bond strengthvalues of heat-polymerized and CAD/CAM (milled) denture base resins. CONCLUSION. Different combinationsof materials for removable denture base and denture teeth can affect their bond strength. Cold-polymerized resinshould be avoided for attaching prefabricated teeth to a denture base. CAD/CAM (milled) and heat-polymerizeddenture base resins bonded to different types of prefabricated teeth show similar shear bond strength values.