Long-term survival of endodontically treated molars without crown coverage: a retrospective cohort study. J Prosthet Dent.

By Nagasiri R1, Chitmongkolsuk S.

Date: 05/2006
Journal: The journal of prosthetic dentistry

Summary 

Purpose: to evaluate the survival rate for endodontically treated molars without crown coverage and to identify possible related factors.

N= 220 endodontically treated permanent molar teeth. 

Materials and Methods:

•Patients on a waiting list for fixed prosthodontic treatment (no provisional crowns or definitive restorations).

•Follow-up data were derived from a clinical examination and review of the dental record and radiographs.

•Failure outcome: if there were negative findings in the condition of a tooth that required a restoration, tooth repair, or extraction. 

•The independent variables assessed were patient age, gender, location (maxilla or mandible), the existence of an opposing dentition and adjacent teeth, remaining tooth structure, and types of restorative material.  •Defining the amount of remaining tooth structure (type I maximum remaining tooth structure, type II moderate and type III minimum).

Results:

-Overall survival rates of endodontically treated molars without crowns at 1, 2, and 5 years were 96%, 88%, and 36%, respectively. 

-Molar teeth with maximum tooth structure (Type I) had a survival rate of 78% at 5 years.

-Direct composite restorations had a better survival rate (90%) than conventional amalgam and IRM

Clinical significance: 

-The amount of remaining tooth structure and types of restorative material have significant association with the longevity of endodontically treated molars without crown coverage.