title: Molar fracture resistance after adhesive restoration with ceramic inlays or resin-based composites.
abstract: OBJECTIVE
  To determine the fracture resistance of teeth, following treatment with various types of adhesive restorations.
  
  
  METHODS
  5 0 caries-free, extracted human molars were randomly divided into five groups consisting of 10 molars each. MOD cavities were prepared in 40 molars with a width in the facio-lingual direction of 50% of the intercuspal distances. The cavities were filled with the following materials: Cerec or IPS Empress ceramic inlays, Arabesk or Charisma F resin-based composite (RBC) restorations. The control group consisted of 10 sound, non-restored molars. All 50 teeth were loaded occlusally until fracture using a tensile testing machine. The statistical analysis included ANOVA, Kolmogorov-Smimov-test, Scheffé test, and boxplots.
  
  
  RESULTS
  There was no significant difference (P > 0.05) between the mean values of the sound teeth (2,102 N) and the teeth with the Cerec ceramic inlays (2,139 N). However, both groups demonstrated a significant difference (P < 0.05) when compared with the teeth with IPS Empress ceramic inlays (1,459 N) and Arabesk RBC restorations (1459 N). No significant differences were found between the last two groups. Molars restored with Charisma F composite restorations (1,562 N) revealed no significant difference when compared with all other groups including controls (P > 0.05). A stabilization of molars is possible by means of an adhesive restoration in the form of an "internal splinting" regardless of the restorative material used.
authors.affiliation: Department of Prosthodontics, Medical University Hannover, Germany.
authors.forename: B D
authors.initials: BD
authors.lastname: Bremer
authors.forename: W
authors.initials: W
authors.lastname: Geurtsen
mesh_terms: D000179:Acrylates; D000180:Acrylic Resins; D000538:Aluminum Silicates; D000704:Analysis of Variance; D001732:Bite Force; D002516:Ceramics; D003188:Composite Resins; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000009:adverse effects; D003776:Dental Porcelain; D003793:Dental Restoration, Permanent / Q000009:adverse effects / Q000379:methods*; D006801:Humans; D007284:Inlays; D008422:Materials Testing; D011140:Polyurethanes; D011897:Random Allocation; D019279:Resin Cements; D018709:Statistics, Nonparametric; D013718:Tensile Strength; D014082:Tooth Fractures / Q000209:etiology / Q000517:prevention & control*
chemical_list: D000179:Acrylates; D000180:Acrylic Resins; D000538:Aluminum Silicates; C425826:Arabesk; C084111:Charisma composite resin; C029012:Composite Dental Resin; D003188:Composite Resins; C075815:IPS-Empress ceramic; D011140:Polyurethanes; D019279:Resin Cements; D003776:Dental Porcelain; C074543:Cerec; C040415:heliobond