title: The timing of subsequent treatment for teeth restored with large amalgams and crowns: factors related to the need for subsequent treatment.
abstract: Crowns and large amalgams protect structurally compromised teeth to various degrees in different situations. The aim of this investigation was to evaluate the survival of teeth with these two types of restorations and the factors associated with better outcomes. Retrospective administrative and chart data were used. Survival was defined and modeled as: (1) receipt of no treatment and (2) receipt of no catastrophic treatment over five- and 10-year periods. Analyses included: Kaplan-Meier survival curves, Log-Rank tests, and Cox proportional hazards regression modeling. Crowns survived longer with no treatment and with no catastrophic treatment; however, mandibular large amalgams were least likely to have survived with no treatment, and maxillary large amalgams were least likely to have survived with no catastrophic treatment. Having no adjacent teeth also decreased survival. Crowns survived longer than large amalgams, but factors such as arch type and the presence of adjacent teeth contributed to the survival of large amalgams.
authors.affiliation: University of Michigan, School of Dentistry, Department of Cariology, Restorative Sciences, and Endodontics, 1011 N. University Ave., Ann Arbor, MI 48109-1078, USA. jkolker@umich.edu
authors.forename: J L
authors.initials: JL
authors.lastname: Kolker
authors.forename: P C
authors.initials: PC
authors.lastname: Damiano
authors.forename: M P
authors.initials: MP
authors.lastname: Jones
authors.forename: D V
authors.initials: DV
authors.lastname: Dawson
authors.forename: D J
authors.initials: DJ
authors.lastname: Caplan
authors.forename: S R
authors.initials: SR
authors.lastname: Armstrong
authors.forename: S D
authors.initials: SD
authors.lastname: Flach
authors.forename: R A
authors.initials: RA
authors.lastname: Kuthy
authors.forename: J J
authors.initials: JJ
authors.lastname: Warren
mesh_terms: D001641:Bicuspid; D003442:Crowns; D003723:Dental Amalgam; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000379:methods*; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008963:Molar; D016016:Proportional Hazards Models; D019233:Retreatment; D012189:Retrospective Studies; D016019:Survival Analysis; D013997:Time Factors
chemical_list: D003723:Dental Amalgam