Effect of preparation design on the fracture resistance and fracture patterns of 3D printed one-piece endodontic crowns.

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  • Additional Information
    • Source:
      Publisher: Mosby-Year Book Country of Publication: United States NLM ID: 0376364 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1097-6841 (Electronic) Linking ISSN: 00223913 NLM ISO Abbreviation: J Prosthet Dent Subsets: MEDLINE
    • Publication Information:
      Publication: St. Louis Mo : Mosby-Year Book
      Original Publication: St. Louis, Mosby.
    • Subject Terms:
      Printing, Three-Dimensional* ; Crowns* ; Dental Prosthesis Design* ; Bicuspid* ; Computer-Aided Design* ; Dental Stress Analysis*; Humans ; Dental Restoration Failure ; Tooth Fractures
    • Abstract:
      Statement of Problem: The impact of various preparation designs on the fracture resistance and fracture type of mandibular premolars restored with 3 dimensionally (3D) printed, 1-piece endodontic crowns remains unclear.
      Purpose: The purpose of this study was to investigate the effect of different preparation designs on the fracture resistance and fracture patterns of mandibular premolars restored with 3D printed 1-piece endodontic crowns after thermal aging.
      Material and Methods: Forty-five freshly extracted mandibular premolars received 3 different preparation designs: with at least 2 intact cuspal walls (2CW), with only 1 intact cuspal wall (1CW), and no cuspal wall present (NoCW). One-piece endodontic crowns were designed by using a computer-aided design (CAD) software program, 3D printed, cemented to the prepared teeth with self-adhesive resin cement, and thermocycled between 5 °C and 55 °C in artificial saliva. Subsequently, all specimens were subjected to a fracture test. The results were statistically analyzed using 1-way ANOVA (α=.05), and fracture types of all specimens were examined using a light microscope.
      Results: The analysis of fracture resistance values across separate designs revealed no statistically significant differences (P>.05). Mean fracture resistance values were 724.5 N in 2CW, 713 N in 1CW, and 861 N in NoCW. In 2CW and 1CW, the 1-piece endodontic crowns mostly displayed Type III fractures, whereas those in NoCW exhibited a combination of Type II and Type III fractures.
      Conclusions: The mandibular premolar 1-piece endodontic crowns tested in this study exhibited similar fracture resistance and type of fracture with different preparation designs.
      (Copyright © 2024 Editorial Council for The Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.)
    • Publication Date:
      Date Created: 20240703 Date Completed: 20240911 Latest Revision: 20240911
    • Publication Date:
      20240912
    • Accession Number:
      10.1016/j.prosdent.2024.06.004
    • Accession Number:
      38960755