ABSTRACT
OBJECTIVE: To evaluate the resistance to fracture of endodontically treated teeth restored with combined composite-amalgam restorations in comparison to all-amalgam restorations. METHOD AND MATERIALS: Forty-eight human premolar teeth were equally divided into 4 groups. Mesio-occlusodistal (MOD) cavities were prepared in 3 groups, and in the fourth group, a modified MOD preparation was designed with an additional buccolingual groove. All teeth were endodontically treated and restored using 1 of several restorative modalities: all amalgam (AM), all amalgam plus dentin adhesive (ADA), amalgam plus dentin adhesive plus composite resin (ADAC), and amalgam plus dentin adhesive plus composite resin with a modified preparation design (ADACM). Specimens were tested in a universal testing machine (Instron). The load (in kilonewtons) at fracture was recorded and statistically analyzed using a Bonferroni one-way statistical analysis (significance: PSubject(s)
Composite Resins
, Dental Amalgam
, Dental Restoration, Permanent/methods
, Tooth Fractures/physiopathology
, Tooth, Nonvital/therapy
, Acid Etching, Dental
, Bicuspid
, Composite Resins/chemistry
, Dental Amalgam/chemistry
, Dental Cavity Preparation/methods
, Dental Restoration Failure
, Dental Stress Analysis/instrumentation
, Dentin-Bonding Agents/chemistry
, Humans
, Materials Testing
, Methacrylates/chemistry
, Phosphoric Acids/chemistry
, Resin Cements/chemistry
, Root Canal Therapy/methods
, Stress, Mechanical