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Comparison of intracoronal bleaching methods on teeth discolored by different antibiotic pastes

1 Department of Endodontics, Faculty of Dentistry, Marmara University, Istanbul, Turkey
2 Department of Endodontics, Acibadem Hospital, Istanbul, Turkey
3 Department of Restorative Dentistry, Faculty of Dentistry, Marmara University, Istanbul, Turkey

Correspondence Address:
E Iriboz,
Department of Endodontics, Faculty of Dentistry, Marmara University, Buyukciftlik Sokak No 6, 34365 Nisantasi-Sisli, Istanbul
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Source of Support: None, Conflict of Interest: None

Aim: To compare the bleaching efficacy of sodium perborate with different activation methods on crowns discolored by two different antibiotic pastes. Materials and Methods: Eighty-five extracted human incisors were prepared to size #30 using ProTaper rotary instruments. After chemomechanical preparation and irrigation procedures, the specimens received triple antibiotic paste (TAP, n = 40), minocycline paste (MP, n = 40), or calcium hydroxide (n = 5, control group) and coronally sealed with temporary filling material. Spectrophotometric readings were obtained on day 0–week 4. Data were analyzed with the Mann–Whitney U-test and Wilcoxon sign test (P < 0.05). Sodium perborate was then inserted into the pulp chambers of discolored teeth (four subgroups, n = 10) and activated by heat or ultrasonically using two different frequencies and times. Spectrophotometric readings were obtained on days 3–7. Data were analyzed by the Mann–Whitney U-test and Kruskal–Wallis test (P> 0.05). Results: Both groups showed statistically significant coronal discoloration at each time interval (P < 0.01), but their final shades did not significantly differ between the groups (P> 0.05). Although the MP subgroups exhibited more bleaching than the TAP subgroups on days 3 and 7, the difference was not significant (P> 0.05). The bleaching results for the sodium perborate activation techniques did not significantly differ among groups (P> 0.05). Conclusions: Both antibiotic pastes induced crown discoloration that was reversible using all sodium perborate bleaching techniques.

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