Resumo

KUGA, Milton Carlos et al. In vitro evaluation of intracanal medication pH of calcium hydroxide in association with chlorhexidine and racealfatocoferol. RFO UPF [online]. 2010, vol.15, n.2, pp. 150-154. ISSN 1413-4012.

OBJECTIVE: The aim of this study was to evaluate the pH of calcium hydroxide (Calen^TM) when associated or not with chlorhexidine 0.4%, and when associated with chlorhexidine with the addition of 20% or 10% of alphatocopherol (Aché^TM), assessed in several periods of time. METHODS: Fourty dentine tubes 20 mm, properly standardized, were made from bovine anterior teeth roots. Following, a perforation was achieved in the roots distal face at 7 mm from the cervical radicular line by using a #1/2 carbide bur. After complete root sealing is made, except in the perforation local, the radicular canals were filled with one of the following associations: Group I - Calen®; Group II - Calen™ with chlorehxidine at 0.4%; Group III - Calen™ with chlorhexidine at 0.4% with the addition of 20% (weight) of alhatocopherol compound and Group IV - Calen™ with chlorhexidine at 0.4% with the addition of 10% (weight) alphatocopherol. After cervical sealing is accomplished, the roots were immersed in water MiliQ and the pH, assessed in 24h, 7, 14, 21, 28 and 45 days. RESULTS AND CONCLUSION: In all periods tested, the pH of the calcium hydroxide (Calen™) was similar to the pH of the calcium hydroxide (Calen™) associated with chlorhexidine 0.4% and 10% alphatocopherol (p > 0.05). The association of 20% alphatocopherol obtained the pH lower than the association with 10% (p < 0.05). The pH of the association with chlorhexidine was similar to the pure calcium hydrocide (Calen™) after the 14^th day (p > 0.05) only. Therefore, on the 45^th day, this difference was significant again (p < 0.05).

Palavras-chave : Calcium hydroxide; Chlorhexidine gluconate; Alpha-tocopherol.