J Adv Prosthodont.  2020 Oct;12(5):251-258. 10.4047/jap.2020.12.5.251.

Shear bond strength between CAD/CAM denture base resin and denture artificial teeth when bonded with resin cement

Affiliations
  • 1Department of Prosthodontics, College of Dentistry, Dankook University, Cheonan, Republic of Korea
  • 2Department of Dental Laboratory Technology, Daejeon Health Institute of Technology, Daejeon, Republic of Korea
  • 3Department of Prosthododntics, College of Dentistry, Dankook Univeristy, Cheonan, Republic of Korea

Abstract

PURPOSE
The bond strengths between resin denture teeth with various compositions and denture base resins including conventional and CAD/CAM purposed materials were evaluated to find influence of each material.
MATERIALS AND METHODS
Cylindrical rods (6.0 mm diameter × 8.0 mm length) prepared from pre-polymerized CAD/CAM denture base resin blocks (PMMA Block-pink; Huge Dental Material, Vipi Block-Pink; Vipi Industria) were bonded to the basal surface of resin teeth from three different companies (VITA MFT® ; VITA Zahnfabrik, Endura Posterio® ; SHOFU Dental, Duracross Physio® ; Nissin Dental Products Inc.) using resin cement (Super-Bond C&B; SUN MEDICAL). As a control group, rods from a conventional heat-polymerizing denture base resin (Vertex™ Rapid Simplified; Vertex-Dental B.V. Co.) were attached to the resin teeth using the conventional flasking and curing method. Furthermore, the effect of air abrasion was studied with the highly cross-linked resin teeth (VITA MFT® ) groups. The shear bond strengths were measured, and then the fractured surfaces were examined to analyze the mode of failure.
RESULTS
The shear bond strengths of the conventional heat-polymerizing PMMA denture resin group and the CAD/CAM denture base resin groups were similar. Air abrasion to VITA MFT® did not improve shear bond strengths. Interfacial failure was the dominant cause of failure for all specimens.
CONCLUSION
Shear bond strengths of CAD/CAM denture base materials and resin denture teeth using resin cement are comparable to those of conventional methods.

Keyword

CAD/CAM denture base resin; Denture resin tooth; Resin cement; Shear bond strength; Mode of failure
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