Wear profile of canal wall surfaces and bond strength of endodontic sealers after in situ acid challenge

Abstract

Aim

To evaluate the wear of root wall surfaces, the bond strength of sealers to dentine and the demineralization around filling material after the canals were exposed to acid challenge.

Methodology

Eighty-seven roots of mandibular incisors were selected. Thirty-two were used in the bond strength in vitro study (n=8) and 55 in the in situ study (n=11). Root canals were prepared biomechanically and then filled with gutta-percha and AH Plus, MTA Fillapex, Sealapex or Endofill. For 14 days, 11 participants used intraoral devices with 5 sterilized roots (4 experimental and 1 control – only canal prepared). Drops of sucrose were dripped onto roots allowing the accumulation of biofilm on canal surfaces. Roots were removed, sectioned and analysed for: bond strength of filling material using a push-out test and also wear profile and dentine demineralization using confocal microscopy. Bond strength (MPa) was evaluated by two-way ANOVA and Tukey test (α=0.05) and wear profile was assessed by Kruskal-Wallis and t-tests (α=0.05).

Results

AH Plus had the highest bond strength values. Intermediate results were found in roots with MTA Fillapex and Endofill, whilst Sealapex had inferior results (P <0.05). No significant differences were found among root thirds (P >0.05). For wear profile, samples had degradation of the filling materials after exposure to the oral environment (P <0.05). Roots had signs of demineralization around the filling material when Sealapex and Endofill were used.

Conclusions

Sealers were not able to prevent degradation of the adhesive interface and dentine. AH Plus and MTA Fillapex had superior bond strength to dentine and less intense demineralization around the root filling.

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