Resistencia a fratura de pre-molares com preparos cavitarios extensos restaurados atraves de sistemas adesivos e não adesivos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2000

RESUMO

The aim of this study was to evaluate the fracture resistance of maxillary premolars with large cavities preparations. Thirty extracted maxillary premolars, sound and free from cracks were randomly assigned to six groups of five teeth each. The teeth from group 1 did not receive cavity preparations (positive control). In group 2, the teeth received preparations but did not receive restorations (negative control). From groups 3 to 6, the teeth received MO preparations and were restored according to the following techniques: G3: single Bond + Solitaire; G4: Single Bond + Z250; G5: Amalgam; G6: Amalgam + Panavia. All groups were submitted to fracture resistance test in a Universal Test Machine (Instron). The load was applied vertically through a metallic sphere of 4,7 mm diameter, touching only the cusps and never the restorations or cavity margins. The average load necessary to fracture the samples in each group was (in Kgf), G6= 168,46 (A); G5 = 155,19 (A) ; G1=153,54 (A) ; G4= 148,86 (A); G3= 80,08 (B) ; G2= 20,51 (C). The data were submitted to Tukey?s test that revealed differences among some groups showed above with different letters. These results show that all materials tested can recover the fracture resistance of maxillary premolars as much as a sound tooth, except Solitaire resin

ASSUNTO(S)

premolars fraturas fracture resistance dentes adhesive restorations adesivos dentarios

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