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A practice based longevity study on single-unit crowns.

Kauê Collares1, Marcos B Correa1, Ewald M Bronkhorst2

  • 1Graduate Program in Dentistry, School of Dentistry, Federal University of Pelotas, Pelotas, RS, Brazil.

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|May 26, 2018
PubMed
Summary

Single unit crown longevity is generally good, but endodontically treated teeth significantly increase failure risk. Dentist practice patterns also influence crown survival rates, highlighting the need for careful patient selection and treatment planning.

Keywords:
Clinical studyCrownsDental restorationLongitudinal studyPractice based studyProsthodonticsSurvival analysis

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Area of Science:

  • Dental Restorations
  • Prosthodontics
  • Clinical Dentistry

Background:

  • Single unit crowns are common dental restorations.
  • Assessing the long-term success of these restorations is crucial for clinical practice.
  • Identifying factors influencing crown longevity can improve patient outcomes.

Purpose of the Study:

  • To evaluate the longevity of single unit crowns placed by multiple dentists.
  • To identify risk factors associated with crown failures.

Main Methods:

  • Retrospective longitudinal study analyzing 3404 full crown restorations in 1557 patients.
  • Calculated annual failure rates (AFRs) and used multivariate Cox-regressions with shared frailty.
  • Data collected from Dutch dentists between 1996 and 2011.

Main Results:

  • Mean AFR at 11 years was 2.1% for success and 0.7% for survival.
  • Endodontic treatment was a significant risk factor for crown failure (HR 1.31 for success, 1.89 for survival).
  • Tooth type, position, gender, and patient age also influenced crown success and survival.

Conclusions:

  • Single unit crowns placed by this group of dentists demonstrated acceptable success and survival rates.
  • Endodontically treated teeth represent a significant risk factor for crown failure.
  • Practice-specific variations exist, emphasizing the importance of individual dentist performance.