Patterns of Retentive Failures in Dislodged Single Crowns

Retentive failures in crowns

  • Mubashir Sharif Combined Military Hospital Quetta/National University of Medical Sciences (NUMS), Pakistan
  • Samina Aslam Armed Forces Institute of Dentistry/National University of Medical Sciences (NUMS), Rawalpindi Pakistan
  • Imran Khan McCrae Dental Surgery, Bendigo VIC Australia
  • Abdul Rehman Military Dental Centre, Peshawar Pakistan
  • Mansoor Khan Foundation University College of Dentistry & Hospital, Islamabad Pakistan
  • Muhammad Afzal Military Dental Centre, Peshawar Pakistan
Keywords: Crowns, Dental Prosthesis Failure, Dental Prosthesis Retention


Objective: The study aimed to ascertain the prevalence of retentive failure patterns of single crowns leading to de-cementation of the crowns and to estimate their average length of service.

Study Design: Cross-sectional study.

Place and Duration of Study: Department of Prosthodontics, Armed Forces Institute of Dentistry, Rawalpindi Pakistan, from May to Nov 2020.

Methodology: 80 patients were selected using the non-probability Consecutive sampling technique. Both male and female patients with only single-unit crowns were included. In addition, the material used for the fabrication of crowns, years of service and site of retentive failure were recorded.

Results: Female patients (41, 51.3%) reported more frequently than males (39, 48.8%). The majority of the dislodged crowns (41, 51.3%) concerned the mandibular posterior region. Almost half of the crowns (44, 55%) dislodged due to fracture occurring at the interface of restoration and the cement. 68.8% of crowns served for 1-3 years before dislodgement. Most of the dislodged restorations (30, 37.5%) were provided by general dentists.

Conclusion: Mandibular posterior crowns were the most prevalent crowns that were dislodged, and the estimated length of most of the crowns was up to 3 years. Therefore, the anatomy of the tooth being prepared must be considered before preparing the tooth so that retentive failure may be reduced, thus improving the overall length of service.


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How to Cite
Sharif, M., Aslam, S., Khan, I., Rehman, A., Khan, M., & Afzal, M. (2022). Patterns of Retentive Failures in Dislodged Single Crowns. PAFMJ, 72(3), 1090-93.
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