Efetividade de três métodos de remoção da medicação intracanal contendo hidróxido de cálcio com composições químicas diferentes e a repercussão sobre a penetrabilidade e resistência de união do cimento endodôntico na dentina radicular
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Data
2017-09-28
Autores
Venção, Ana Carolina [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O objetivo deste estudo foi avaliar a eficiência de três métodos de remoção da medicação intracanal contendo hidróxido de cálcio(CH) com propilenoglicol(PG) e meticelulose(MC) e sua repercussão sobre a resistência de união e penetração de um cimento endodôntico (AH Plus) à dentina radicular. Inicialmente sessenta dentes unirradiculares foram preparados até o instrumento F5, em seguida foram divididos em 2 grupos(n=30) de acordo com o veículo(PG) e (MC). Após 7 dias, foram realizadas microtomografias dos espécimes, e mensurados a área total de preenchimento da medicação contendo hidróxido de cálcio no canal radicular. Em seguida os espécimes foram submetidos a três protocolos de remoção n=10: irrigação convencional(CI), irrigação ultrassônica passiva(PUI) e irrigação ultrassônica contínua(CUI) e uma nova análise microtomográfica foi realizada. A persistência dos resíduos HC (em mm3) foi avaliada após o uso dos protocolos de remoção. Em seguida os mesmos espécimes foram obturados com cimento endodôntico à base de resina epóxi associados com rodamina, e após a divisão em terços cervical, médio e apical, foram submetidos aos testes de push-out e posteriormente análise dos tipos de fratura e em seguida análise da penetração dentinária com microscopia a laser confocal. Houve similar persistência de resíduos de HC, independentemente do segmento analisado (P>0.05). Os valores obtidos no teste de push-out e penetração dentinária foram similar nos terços cervical e médio radicular (P >0.05). Somente no terço apical radicular, CI-P demonstrou menor valor de push-out que os obtidos pela CUI (P<0.05), além de CI-M também demonstrar menor valor que CUI e o PUI-M (P<0.05) e a penetração do cimento na dentina foi maior em CUI que em IC, independente do veículo da medicação intracanal (P<0.05). Nenhum protocolo de irrigação removeu totalmente a HC do canal radicular e, somente no terço apical radicular, a CUI favoreceu a resistência de união e penetração do cimento na dentina em relação à CI.
The aim of this study was to evaluate the efficiency of three methods of removing intracanal medication containing calcium hydroxide (CH) with propyleneglycol (PG) and methylcellulose (MC) and its repercussion on the push –out bond streght of na endodontic sealer (AH Plus) on the radicular dentin. Initially sixty unirradicular extracted teeth were prepared to F5 instrument, then divided into 2 groups (n=30) according to vehicle (PG) and (MC). After 7 days, microtomographies of the specimens were performed and the total filling área of the calcium hydroxide containing medication in the root canal was measured. Afterwards the specimens were submitted to three removal protocol (n=10): conventional irrigation (IC), passive ultrasonic irrigation (PUI) and continuous ultrasonic irrigation (CUI) and a new microtomographic analysis was performed. The persistence of HC residues (em mm3) was evaluated after the use of the removal protocols. Then, the same specimens were filled with epoxy based endodontic sealer associated with rhodamine, and after divided into cervical, middle and apical thirds, they were submitted to the push-out tests and later analysis of fracture types and then analysis of penetrability in dentin with laser confocal microscopy. The persistence resíduos of HC was similar independente of the segment analyzed (P>0.05). The values obtained in the push out test and dentin penetrability were similar in the cervical and middle thirds (P>0.05). Only in the apical radicular third, CI-M also showed lower value than those obtained by CUI (P<0.05) and the sealer dentin penetrability was higher in CUI than in IC, independente of intracanal medication vehicle. No irrigation protocol eliminated totally HC of the root canal and only in the apical radicular third that CUI favored the push-out bond strength and the sealer penetrability in the dentin in relation to IC.
The aim of this study was to evaluate the efficiency of three methods of removing intracanal medication containing calcium hydroxide (CH) with propyleneglycol (PG) and methylcellulose (MC) and its repercussion on the push –out bond streght of na endodontic sealer (AH Plus) on the radicular dentin. Initially sixty unirradicular extracted teeth were prepared to F5 instrument, then divided into 2 groups (n=30) according to vehicle (PG) and (MC). After 7 days, microtomographies of the specimens were performed and the total filling área of the calcium hydroxide containing medication in the root canal was measured. Afterwards the specimens were submitted to three removal protocol (n=10): conventional irrigation (IC), passive ultrasonic irrigation (PUI) and continuous ultrasonic irrigation (CUI) and a new microtomographic analysis was performed. The persistence of HC residues (em mm3) was evaluated after the use of the removal protocols. Then, the same specimens were filled with epoxy based endodontic sealer associated with rhodamine, and after divided into cervical, middle and apical thirds, they were submitted to the push-out tests and later analysis of fracture types and then analysis of penetrability in dentin with laser confocal microscopy. The persistence resíduos of HC was similar independente of the segment analyzed (P>0.05). The values obtained in the push out test and dentin penetrability were similar in the cervical and middle thirds (P>0.05). Only in the apical radicular third, CI-M also showed lower value than those obtained by CUI (P<0.05) and the sealer dentin penetrability was higher in CUI than in IC, independente of intracanal medication vehicle. No irrigation protocol eliminated totally HC of the root canal and only in the apical radicular third that CUI favored the push-out bond strength and the sealer penetrability in the dentin in relation to IC.
Descrição
Palavras-chave
Endodontia, Hidróxido de cálcio, Resistência ao cisalhamento, Microscopia confocal, Endodontics, Calcium hydroxide, Shear strength, Microscopy confocal