Repair of crown margins may extend the functional life of existing crowns. However, the longevity of such treatment is unknown. This study determined the survival time of crown margin repairs (CMR) with glass ionomer and resin modified glass ionomer cements.
We queried axiUm (Exan Group, Coquitlam, BC, Canada) database for permanent teeth that underwent CMR in Graduate Operative Dentistry Clinic, Indiana University School of Dentistry (IUSD), Indianapolis, IN, USA, from January 1, 2006 through January 1, 2018. Since there is no CDT code for the CMR procedure, CDT codes for resin-composite and glass-ionomer restorations (D23XX) were queried; these patients also had treatment notes that indicated CMR. The final data set included patient ID, birth date, gender, dates of treatments, CDT codes, tooth type, tooth surface and existing findings. Two examiners developed guidelines for record review and manually reviewed the clinical notes of patient records to confirm CMR. Only records that were confirmed with the presence of CMR were retained in the final dataset for survival analysis. Survival time was calculated by Kaplan Meier statistics and a Cox proportional hazards model was performed to assess the influence of selected variables (p<0.05).
214 teeth (115 patients) with CMR were evaluated. Patient average age was 69.4 11.7 years old. Posterior teeth accounted for 78.5% (n=168) of teeth treated. CMRs using glass-ionomer had a 5-year survival rate of 62.9% and 8.9% annual failure rate. Cox Proportional Hazards Regression analysis revealed that none of the factors examined (age, gender, tooth type) affected time to failure.
CMRs may extend the longevity of crowns with defective margins. Larger EHR studies or case control studies are needed investigate other variables, such as caries risk status or severity of defects, that may affect survival rate of CMR.
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