Fracture Resistance of Bonded CAD/CAM Restorations with Standard or Extended Preparations

Abstract

Colloquial conversations have been reported, in both educational and private practice settings that bonded CAD/CAM restorations reinforce cusps with wide, extended preparations and reduced cuspal thickness. The purpose of this study was to evaluate the fracture resistance of teeth with standard or extended preparations bonded with CAD/CAM materials. Extracted third molars were prepared and scanned with a CAD/CAM acquisition unit. Ten teeth per preparation type (standard or extended) were restored with milled lithium disilicate or resin nano ceramic materials, or left unrestored (negative control). An additional ten teeth were not prepared nor restored (positive control). After thermocycling and cyclic loading, specimens were fractured in a material testing device. Although bonded CAD/CAM restorations reinforced tooth structure,fracture load was significantly lower with teeth with extended preparations. The type of CAD/CAM restorative material did not significantly affect fracture load.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 2017
Accession Number
AD1063875

Entities

People

  • Stephen C. Arnason

Organizations

  • Uniformed Services University of the Health Sciences

Tags

Communities of Interest

  • Biomedical

DTIC Thesaurus Topics

  • Air Force
  • Ceramic Materials
  • Composite Materials
  • Computer-Aided Design
  • Department Of Defense
  • Flexural Strength
  • Governments
  • Materials
  • Physical Properties
  • Resins
  • Resistance
  • Schools
  • Simulators
  • Standards
  • Teeth
  • United States Government
  • Universities

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