Influência de tratamentos superficiais na resistência de união de reparo em resina a base de silorano: análise após envelhecimento

Abstract

The aim of the present study was to evaluate the influence of different surface treatments on bond strength of repair resin-based silorane through microtensile test. 160 silorane blocks were randomly distributed among 40 experimental groups (n=4) resulting from the interaction of three factors under study: surface treatment, adhesive system and resin used to repair. The blocks were stored for 9 days in deionized water at 37°C prior to surface treatment and repair. Repair was performed, after the use of a bonding agent: (Ad 1) Silorane bond or (Ad 2) Adper Scotchbond, with Filtek P90 (P90) or Filtek Z350 XT (Z350 XT) on one of the 10 treatment protocols: control (C), silane (Si), phosphoric acid (Pa), Pa plus Si (PaSi), hydrofluoric acid (Ha), Ha plus Si (HaSi), sandblasting (S), S plus Si (SSi), diamond bur (Db), Db plus Si (DbSi). Blocks were sectioned into beams and after age by storage for six months, subjected to microtensile testing and subsequent analysis in a stereoscope to define the failure types. Additionally, 10 blocks of Filtek P90 composite resin were made for surface analysis by SEM, after completion of surface treatment. Statistical analysis (Mann-Whitney, Kruskal- Wallis and Dunn tests, α=0.05) was performed. The values were statistically influenced by the type of resin (p<0.001) and by the surface treatment (p<0.0001), but not by the bonding agent (p=0,940). SSi, Ha and HaSi produced similar bond strength values, the greatest. Treating the surface with Db showed the worst values and composite resin P90 generated higher bond strength values than Z350 XT to repair silorane surfaces.