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Assessment of the Mouth

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Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Published on: December 20, 2024

A prospective, multi-center, practice-based cohort study on all-ceramic crowns.

R J Wierichs¹, E J Kramer², B Reiss³

¹Department of Restorative, Preventive and Pediatric Dentistry, School of Dental Medicine, University of Bern, Switzerland; Department of Biohybrid & Medical Textiles, Institute of Applied Medical Engineering, RWTH Aachen University, Aachen, Germany.

Dental Materials : Official Publication of the Academy of Dental Materials

|May 11, 2021

Summary

This summary is machine-generated.

High annual failure rates were observed for all-ceramic crowns over 15 years. Operative factors, not patient or tooth factors, significantly influenced failure, highlighting the need for improved clinical techniques in restorative dentistry.

Keywords:

(MESH): adhesives Ceramics Clinical study Dental restoration failure Longevity Prospective studies Risk factors Success analysis

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Area of Science:

Dental Materials Science
Clinical Dentistry
Prosthodontics

Background:

All-ceramic crowns are widely used in restorative dentistry.
Understanding factors influencing their long-term success is crucial for clinical practice.
Previous studies have yielded mixed results regarding success predictors.

Purpose of the Study:

To analyze factors associated with the success and survival of all-ceramic crowns.
To evaluate the impact of restorative materials, adhesive techniques, and operative factors on crown longevity.
To identify predictors of failure in a large, practice-based cohort.

Main Methods:

Prospective, multi-center, practice-based cohort study.
Evaluation of 1254 all-ceramic crowns placed by 101 dentists, with over 5 years of follow-up.
Multi-level Cox proportional hazards models used to assess predictors of success and survival.

Main Results:

High annual failure rates (AFR) were observed: 8.4% for success and 4.9% for survival.
Posts in endodontically treated teeth reduced failure risk (2.7 times lower).
Hybrid composite ceramics and single-step adhesives showed higher failure rates (3.4x and 2.2x, respectively) compared to feldspathic porcelain and multi-step adhesives.

Conclusions:

Operative factors, such as material choice and adhesive technique, significantly impact all-ceramic crown longevity.
Patient- or tooth-level factors were not significantly associated with failure.
High failure rates suggest a need for refinement in clinical protocols for all-ceramic restorations.