Silveira BL. In Vitro analsis of bond strength and degradation method between bond
interface of aluminous ceramic and resin cements [Tese de Doutorado]. São Paulo:
Faculdade de Odontologia da USP; 2008.
ABSTRACT
The aim of this study was to evaluate the influence of different surface treatments on
resistance to degradation between In-Ceram Alumina and two resin-based cements.
Sixteen experimental groups were formed according to ceramic treatment:
Sandblasting (S), Rocatec System (R), Nd:YAG Laser (Nd), Nd:YAG Laser plus
Rocatec System (NR); luting cement: Panavia F (Kuraray) or Relyx Unicem (3M
ESPE); and aging method: water (W) or sodium hypochlorite (H). Sixty four In-Ceram
Alumina blocks (10x10x6mm) received four surface treatments: Al
2
O
3
sandblasting;
Al
2
O
3
sandblasting + Rocatec Plus; Al
2
O
3
sandblasting + Nd:YAG Lase; Al
2
O
3
sandblasting + Nd:YAG Laser + Rocatec Plus. Each conditioned ceramic block was
bonded to a composite block using a resin cement system. After 24h storage time,
the blocks were sectioned to obtain sticks with cross-sectional area of 1.0mm
2
. The
specimens were loaded to failure in a universal testing machine at a crosshead
speed of 0.5mm/min. The fractured surface morphology of the debonded specimens
was observed (40X) to evaluate the fracture pattern. Failure modes were classified
as adhesive, cohesive in ceramic, cohesive in resin cement and mixed. The ceramic
treatment and the aging method significantly affected the microtensile bond strength.
Nd:YAG surface treatment resulted in the best bond strength values. To groups luted
with Panavia F cement the microtensile bond strength values were: SW: 27,71±6,3;
RW: 35,67±5,13; NdW: 42,49±6,8; NdRW: 37,41±4,76; SH: 22,27±6,05; RH:
27,49±8,83; NdH: 32,24±6,94; NdRH: 31,75±7,77. To groups luted with RelyX
cement: SW: 26,74±6,34; RW: 35,07±6,02; NdW: 41,05±7,71; NdRW: 33,85±6,03;
SH: 22,77±7,37; RH: 27,84±6,26; NdH: 36,42±5,08; NdRH: 27,6±5,8. Nd:YAG laser
was the most effective surface treatment, followed by Nd:YAG+Rocatec, Rocatec
and Al
2
O
3
sandblasting. Resin cements presented similar behaviors in spite of aging.
NaOCl 12h-immersion decreased Bond strength values.