Objective: The purpose of this study was to determine, by means of a non-destructive experimental procedure, the extent to which tooth cusps are weakened by endodontic procedures and the effectiveness of adhesive bonding restoration in reducing cuspal deflection as function of different restorative procedures. Methods: A mechanically controlled loading device induced cuspal deflection by axial force (range 98 – 294 Newton) on an occlusal surface while sophisticated Laser LTS twin sensor registered the amount of deflection. Cusps deflection values, in microns, were recorded for each tooth (Cerutti et al., IADR-Washington 2000). Thirty sound maxillary premolars teeth were sequentially evaluated in the following conditions: A) intact tooth; B) completion of restorative (cavity MOD preparation:depth 4 mm and width of a half of intercuspal distance) and endodontic procedures. Teeth were randomly divided in five groups (n = 5) and restored respectively with: 1) Amalgam (Dispersalloy); 2) Spectrum TPH; 3) Surefil; 4) Esthet-X; 5) Esthet-X + Dyract flow. The cavity margins were etched with H3PO4– 36%; P&B NT bonding system was used. Results: We evaluated in intact teeth (range 49,52-58,76 N/µm) and in restored teeth (range 8,56-47,05 N/µm) for all groups: A) amount of cusps deflection B) average loading force needed to induce 1 µm andi C) mean structural recovery. Statistical analysis (Anova for repeated measures) has been performed. Mean structural recovery values after restorative treatment were for restored teeth: 17% amalgam, 60% in Spectrum TPH, 59% in SureFil, 54% in Esthet-X, and 99% in Esthet-X/Dyract flow. Conclusions: Bonded composite restorations are effective in reducing cuspal deflection after treatment and in recovering tooth stiffness in endodontically treated premolars.
Effects of adhesive restoration on cuspal deflection in endodontically treated premolars
AMATO, Massimo
2003
Abstract
Objective: The purpose of this study was to determine, by means of a non-destructive experimental procedure, the extent to which tooth cusps are weakened by endodontic procedures and the effectiveness of adhesive bonding restoration in reducing cuspal deflection as function of different restorative procedures. Methods: A mechanically controlled loading device induced cuspal deflection by axial force (range 98 – 294 Newton) on an occlusal surface while sophisticated Laser LTS twin sensor registered the amount of deflection. Cusps deflection values, in microns, were recorded for each tooth (Cerutti et al., IADR-Washington 2000). Thirty sound maxillary premolars teeth were sequentially evaluated in the following conditions: A) intact tooth; B) completion of restorative (cavity MOD preparation:depth 4 mm and width of a half of intercuspal distance) and endodontic procedures. Teeth were randomly divided in five groups (n = 5) and restored respectively with: 1) Amalgam (Dispersalloy); 2) Spectrum TPH; 3) Surefil; 4) Esthet-X; 5) Esthet-X + Dyract flow. The cavity margins were etched with H3PO4– 36%; P&B NT bonding system was used. Results: We evaluated in intact teeth (range 49,52-58,76 N/µm) and in restored teeth (range 8,56-47,05 N/µm) for all groups: A) amount of cusps deflection B) average loading force needed to induce 1 µm andi C) mean structural recovery. Statistical analysis (Anova for repeated measures) has been performed. Mean structural recovery values after restorative treatment were for restored teeth: 17% amalgam, 60% in Spectrum TPH, 59% in SureFil, 54% in Esthet-X, and 99% in Esthet-X/Dyract flow. Conclusions: Bonded composite restorations are effective in reducing cuspal deflection after treatment and in recovering tooth stiffness in endodontically treated premolars.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
