title: Radiation-induced root surface caries restored with glass-ionomer cement placed in conventional and ART cavity preparations: results at two years.
abstract: BACKGROUND
  There are no published studies comparing the clinical performances of more-viscous glass-ionomer cement (GIC) restorations when placed using conventional and atraumatic restorative treatment (ART) cavity preparation methods to restore root surface caries.
  
  
  METHODS
  One dentist used encapsulated Fuji IX GP and Ketac-Molar to restore 72 conventional and 74 ART cavity preparations for 15 patients who had received cervicofacial radiation therapy. Two assessors evaluated the restorations at six, 12, and 24 months for retention, marginal defects and surface wear, and recurrent caries.
  
  
  RESULTS
  After two years, the cumulative restoration successes were 65.2 per cent for the conventional and 66.2 per cent for the ART cavity preparations, without statistical or clinical significance (P > 0.50). Restoration dislodgement accounted for 82.8 per cent and marginal defects for 17.2 per cent of all failures. There were no instances of unsatisfactory restoration wear or recurrent caries observed. Teeth with three or more restored cervical surfaces accounted for 79.3 per cent of all failures (P < 0.0001).
  
  
  CONCLUSIONS
  For root surface caries restored with GIC, the use of hand instruments only with the ART method was an equally effective alternative to conventional rotary instrumentation for cavity preparation. Larger restorations had higher failures, usually from dislodgement.
authors.affiliation: Department of Operative Dentistry and Endodontics, School of Stomatology, Peking University, Beijing, PR China.
authors.forename: J Y
authors.initials: JY
authors.lastname: Hu
authors.forename: X C
authors.initials: XC
authors.lastname: Chen
authors.forename: Y Q
authors.initials: YQ
authors.lastname: Li
authors.forename: R J
authors.initials: RJ
authors.lastname: Smales
authors.forename: K H
authors.initials: KH
authors.lastname: Yip
mesh_terms: D000328:Adult; D000368:Aged; D016371:Cranial Irradiation / Q000009:adverse effects*; D003737:Dental Cavity Preparation / Q000295:instrumentation* / Q000379:methods; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000379:methods*; D005260:Female; D005899:Glass Ionomer Cements; D006801:Humans; D008297:Male; D008875:Middle Aged; D017213:Root Caries / Q000209:etiology* / Q000628:therapy*; D014783:Viscosity
chemical_list: C439808:Fuji IX GP Fast; D005899:Glass Ionomer Cements; C110712:ketac-molar