ABSTRACT
Objective: To evaluate the influence of calcium hydroxide on the degree of marginal leakage in roots filled with two different types of sealers.Methods: Roots of single-rooted bovine teeth (n=54) were instrumented and divided into four groups of 12 samples each: G1 and G2 were filled with zinc oxide-eugenol sealer, G3 and G4 filled with resin calcium hydroxide based-sealer. The G1 and G3 received calcium hydroxide intracanal medication for seven days. After removal of the medication, samples of the four groups were filled using the lateral condensation technique. The six remaining roots underwent biomechanical preparation, but received no medication or filling, serving as a control group. The apicalthird and part of the middle third were cut, leaving just 6mm in total length. The specimens were immersed in India ink for 72 hours. Cross sections were made to determine the length and depth of penetration of the dye and were quantified macroscopically with the software ImageTool 3.00.Results: The results showed no statistical difference (p <0.05) with the groups that were filled with resin calcium hydroxide based-sealer, regardless of previous use of intracanal medication or not. However when the filling was made with zinc oxide-eugenol sealer, dye penetration was higher in the group that received no intracanal medication. Conclusion: The presence of residues of calcium hydroxide only had an influence on leakage when the sealer was made with zinc oxide-eugenol.
Objetivo: Avaliar a influência do hidróxido de cálcio sobre o grau de infiltração marginal em raízes obturadas com dois tipos de cimentos.Métodos: Raízes de dentes bovinos unirradiculares (n=54) foram instrumentadas e divididas em quatro grupos com 12 amostras: G1 e G2 obturados com cimento à base de óxido de zinco e eugenol; G3 e G4 obturados com cimento resinoso com hidróxido de cálcio. Os grupos G1 e G3 receberam medicação intracanal de hidróxido de cálcio por sete dias. Após a remoção da medicação, os quatro grupos foram obturados pelatécnica de condensação lateral. As seis raízes restantes passaram pelo preparo biomecânico, mas não receberam medicação intracanal nemobturação, serviram como grupo controle. O terço cervical e parte do terço médio das raízes foram seccionados, permanecendo somente 6,0mm do comprimento total. Foram imersas no corante tinta India por 72 horas. Secções transversais foram feitas para verificação da extensãoe profundidade de penetração do corante e quantificadas macroscopicamente com o software ImageTool 3.00. Resultados: Os resultados não apresentaram diferença estatística (p<0,05) com relação aos grupos obturados com cimento resinoso, independente do usoprévio ou não da medicação intracanal. Entretanto quando o cimento à base de óxido de zinco e eugenol foi usado a penetração do corantefoi maior no grupo que não recebeu medicação intracanal. Conclusão: A presença dos resíduos do hidróxido de cálcio influenciou na infiltração marginal, somente quando o cimento usado foi à base de óxido dezinco e eugenol.
Subject(s)
Animals , Coloring Agents , Calcium Hydroxide , Dental LeakageABSTRACT
Aim: To evaluate the influence of residual calcium hydroxide (CH) intracanal medication consideringtwo dye leakage locations (apical foramen and middle root canal third) by quantifying the diffusionof India ink in length and depth. Methods: After biomechanical preparation, 72 single-rootedbovine teeth were divided into two groups in which half was filled with a CH and saline paste. After7 days, the medication was removed and the canals in both groups were filled. Half of thesamples had the apical third and part of middle third removed for infiltration of India ink at themiddle third (MTI), while the rest were infiltrated at the apical foramen (AI). The followingexperimental groups were formed (n = 18 each): A1 CH-medicated + AI, A2 CH-medicated+ MTI, B1 non-medicated + AI, B2 non-medicated + MTI. For evaluation of dye leakage, theexperimental specimens were cross-sectioned, photographed and had the infiltration perimetermeasured using the Image Tool 3.00 software. The Mann-Whitney U-test was used for statisticalanalysis (p<0.05). Results: The lowest values of dye penetration in length and depth werefound in the groups receiving intracanal medication (A1 and A2). Conclusions: Lower dyepenetration in length and depth at the two different locations was observed in the canals withresidual CH intracanal medication.