Marginal adaptation of the Mineral Trioxide Aggregate with and without calcium chloride in root-end cavities
Adaptação marginal do agregado de trióxido mineral com e sem cloreto de cálcio em retrocavidades
Faria-Júnior, Norberto Batista de; Bortoluzzi, Eduardo Antunes; Berbert, Fábio Luiz Camargo Villela; Tanomaru-Filho, Mário; Guerreiro-Tanomaru, Juliane Maria
Rev. odontol. UNESP, vol.40, n2, p.84-90, 2011
Abstract
Objective: To evaluate the marginal adaptation of the Mineral Trioxide Aggregate (MTA) with and without calcium chloride (CaCl2) in root-end cavities. Method: Twenty extracted single-rooted teeth were instrumented and obturated with gutta-percha and AH Plus. All roots were resected using a Zekrya bur and root-end cavities were prepared by using ultrasonic retrotips. Epoxy resin replicas of root-end surfaces after root-end cavity preparation were obtained, sputter coated with gold, and examined by using a scanning electron microscope (SEM). The samples were divided into two experimental groups (n = 10 teeth) according to the root-end filling material employed: G1 - MTA; and G2 - MTA + CaCl2. After the root-end filling, the teeth were stored in moist gauze at 37 °C for 24 hours. New replicas of the root-end surfaces were obtained and examined under a SEM. Marginal adaptation of the filling materials were categorized as: 1) continuous margin; 2) non-continuous margin. Besides, percentages of continuous margin were calculated. The results were analyzed by the Mann-Whitney test. Results: Visible gaps were seen in 2 roots in G1 and in 3 roots in G2. A continuous margin was observed with 95,59% of MTA and 87,48% of MTA + CaCl2 root-end fillings. There was not statistical difference between the two groups (p > 0.05). Conclusion: The addition of CaCl2 to MTA did not alter its marginal adaptation capability to the dentin walls of root-end cavities.
Keywords
Oral surgery, retrograde obturation, dental marginal adaptation
Resumo
Objetivo: Avaliar a adaptação marginal do Agregado de Trióxido Mineral (MTA) com e sem cloreto de cálcio (CaCl2) em retrocavidades. Método: Vinte dentes unirradiculados foram instrumentados e obturados com guta-percha e AH-Plus. Os ápices das raízes foram cortados com uma broca Zekrya e preparos retrógrados foram realizados com pontas ultrassônicas. Réplicas em resina dos ápices preparados foram obtidas, metalizadas com ouro e examinadas em microscopia eletrônica de varredura (MEV). Os espécimes foram divididos em dois grupos experimentais (n = 10 dentes), de acordo com o material retrobturador empregado: G1 – MTA e G2 – MTA + CaCl2. Após as retrobturações, os dentes foram mantidos em ambiente úmido a 37 °C por 24 horas. Novas réplicas de resina foram obtidas e levadas ao MEV. A adaptação marginal dos cimentos foi classificada como: 1) margem contínua; 2) margem não contínua. Além disso, os percentuais de margem contínua foram calculados. Os resultados foram analisados pelo teste de Mann-Whitney. Resultados: Falhas de adaptação foram observadas em duas raízes no G1 e três raízes no G2. O percentual de margem contínua foi de 95,59% no grupo com MTA e 87,48% no grupo com MTA + CaCl2. Não houve diferença estatística significativa entre os dois grupos (p > 0,05). Conclusão: A adição do cloreto de cálcio ao MTA não alterou a sua capacidade de adaptação marginal às paredes dentinárias das retrocavidades.
Palavras-chave
Cirurgia bucal, obturação retrógrada, adaptação marginal dentária
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