title: The failure rate of adhesively retained composite core build-ups in comparison with metal-added glass ionomer core build-ups.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the clinical performance of two adhesively retained composite core materials and compare them with a metal-added glass ionomer. The main objective evaluated was total or partial loss of build-ups during the treatment prior to crown cementation.
  
  
  METHODS
  In 187 patients, 315 vital and non-vital teeth were built up after randomisation with either Rebilda D (RD), Rebilda SC (RSC) or Ketac Silver Aplicap (KSA). The composites were applied in the total-etch-technique with the corresponding dentin bonding agent. The metal-added glass ionomer was used with a conditioner. One group of patients was treated by experienced dentists, the other by dental students, in order to evaluate the effects of different levels of experience. Data were analysed using Mann-Whitney-U-Test and binomial logistic regression.
  
  
  RESULTS
  The early failure rate (partial or total loss) of core build-ups before crown cementation was significantly higher for KSA (28.8%), as compared to RSC (15.3%, p=0.037) and RD (15%, p=0.025). Most failures were observed during the removal of the temporary crowns. The rate of replacements was between 3.0 (RD/dentists) and 20.4% (KSA/students). Furthermore, we found that build-ups made by students had a significantly higher risk of loss than those made by dentists (p=0.028).
  
  
  CONCLUSIONS
  Adhesively retained self-curing composites show a better clinical short-term performance and can be recommended as core build-up materials.
authors.affiliation: Ruprecht-Karls-Universität Heidelberg, Poliklinik für Zahnärztliche Prothetik, Im Neuenheimer Feld 400, D-69120 Heidelberg, Germany. thomas_stober@med.uni-heidelberg.de
authors.forename: Thomas
authors.initials: T
authors.lastname: Stober
authors.forename: P
authors.initials: P
authors.lastname: Rammelsberg
mesh_terms: D000269:Adhesives; D016722:Cermet Cements; D003188:Composite Resins; D003442:Crowns; D001840:Dental Bonding; D019232:Dental Restoration Failure; D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D016015:Logistic Models; D008689:Methacrylates; D011176:Post and Core Technique; D018709:Statistics, Nonparametric
chemical_list: D000269:Adhesives; D016722:Cermet Cements; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements; D008689:Methacrylates; C488002:Solobond Plus adhesive