title: [Clinical effect of treatment of primary molar teeth with extensive defect using prefabricated metal crowns].
abstract: OBJECTIVE
  To observe the clinical effect of treatment of primary molar teeth with extensive defect using prefabricated metal crowns (PMCs).
  
  
  METHODS
  66 cases, 73 primary molar teeth with extensive defect (class I-III), which can not be repaired by amalgam restoration efficiently, were treated by means of PMCs, and were followed up regularly for 18 months. Chi-square test was used for statistical analysis by SPSS10.0 software package.
  
  
  RESULTS
  18 months after treatment,a total successful rate of 86.30% was achieved, with successful rates of 89.27%, 92.86%, 70.59% for class I-III respectively. Chi(2)=4.779, P=0.092 (P>0.05), there was no significant difference in the effect among the three types using PMCs.
  
  
  CONCLUSIONS
  The clinical effect of the treatment of primary molar teeth with extensive decay using PMCs is satisfactory. In order to enhance the successful rate, it is necessary to restore the decayed teeth prior to using PMCs, control the amount of occlusal reduction, and crimp as required to adapt to gingival margin for snug fit.
authors.affiliation: Department of Preventive & Pediatric Dentistry, College of Stomatology, Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China. zbchi120966@sina.com
authors.forename: Zheng-bing
authors.initials: ZB
authors.lastname: Chi
authors.forename: Xi-ping
authors.initials: XP
authors.lastname: Feng
mesh_terms: D002648:Child; D003442:Crowns; D003731:Dental Caries; D006801:Humans; D008670:Metals; D008963:Molar; D014094:Tooth, Deciduous
chemical_list: D008670:Metals