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International journal of odontostomatology

versión On-line ISSN 0718-381X

Resumen

FERREIRA, Marly Christiènne Capaneli Guimarães; ORSI, Iara Augusta; BORIE-ECHEVARRIA, Evelyn  y  BORIE, Eduardo. Evaluation of Composite Reinforcement on the Fracture Resistance of Teeth with Unsupported Cusps. Int. J. Odontostomat. [online]. 2014, vol.8, n.1, pp.133-139. ISSN 0718-381X.  http://dx.doi.org/10.4067/S0718-381X2014000100018.

This study evaluated the fracture resistance of maxillary premolars with wide Mesial-Occlusal-Distal (MOD) cavity preparations and unsupported cusps restored by four ways, compared with intact teeth. Thirty five human teeth were divided into five groups: control (G1 - intact teeth) and four experimental groups of MOD-prepared teeth: with buccal (B) and lingual (L) cusps reinforced with composite (Z-250) and restored with silver amalgam (Permite C) (G2); teeth with B and L cusps reinforced and linked with composite (P-60) and restored with silver amalgam (Permite C) (G3); teeth restored with composite (Z-250) by incremental fill technique (G4); and teeth with B and L cusps reinforced and linked with composite (P-60) and restored with composite (Z-250) by incremental fill technique (G5). After thermal cycling (500 cycles, 5°C to 55°C), fracture resistance was tested in a universal testing machine. Statistical analysis of the results (ANOVA) revealed no significant difference (p>0.5) among the groups (G1=157.78Kgf, G2=183.99Kgf, G3=152.53Kgf, G4=182.61Kgf and G5=155.96Kgf). Visual analysis of the teeth tested showed predominance of oblique failure pattern. The four types of restoration evaluated provide fracture resistance with values equivalent to intact teeth in MOD-prepared intact teeth with parallel walls and composite-reinforced cusps.

Palabras clave : fracture resistance; composite; dental amalgam.

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