OBJECTIVES: To evaluate in vitro the coronal leakage of endodontically treated teeth sealed with temporary restorative materials with or without coating sealants, and subjected to brushing and thermocycling. MATERIALS AND METHODS: One hundred two extracted human premolars and molars, were endodontically accessed, and restored with 3 types of temporary restorations: 1. Cavit (3M ESPE), 2. Ketac Molar (3M ESPE), 3. Riva Light Cure GlC (SDI). Each type of restoration had one subgroup with a coating (Cavit-Ketac Glaze, Ketac Molar- Ketac Glaze, Riva Light Cure GIC – Riva Coat) and the other without coating. Restored teeth were placed in artificial saliva at 37°C for 24 hours. Teeth were divided into 3 treatment subgroups: Group A: No treatment, soaked at 37° C artificial saliva; Group B: Teeth underwent thermocycling; Group C: teeth underwent both thermocycling and brushing. Thermocycling included 500 cycles between 5°C to 55°C. Tooth brushing was simulated in a brushing machine using 190g weight applied to 16,800 linear strokes. The control group was not exposed to thermocycling or brushing. Leakage was detected by immersion of specimens in 2% methylene blue dye for 24 hours. Specimens were epoxy embedded and sectioned longitudinally. The leakage scores were evaluated from photographs by longitudinal dye penetration depth scored 0 for no leakage and 4 for maximum leakage to the bottom of restoration. Statistical analysis was done to examine the effect of coating and post-treatment on leakage scores. RESULTS: All tested temporary restorative materials with coating had lower leakage than without coating in all experimental groups. CONCLUSIONS: The leakage of temporary restorative materials can be reduced by surface coating, however, thermocycling and brushing treatment can still generate some leakage. / 2020-06-28T00:00:00Z

Submitted by Renata Lopes (renatasil82@gmail.com) on 2016-04-11T12:06:51Z No. of bitstreams: 1 maurohenriquechagasesilva.pdf: 2211214 bytes, checksum: 7e35d9cec8fd1ce921b9e22dec1b0d8f (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-04-24T03:38:38Z (GMT) No. of bitstreams: 1 maurohenriquechagasesilva.pdf: 2211214 bytes, checksum: 7e35d9cec8fd1ce921b9e22dec1b0d8f (MD5) / Made available in DSpace on 2016-04-24T03:38:38Z (GMT). No. of bitstreams: 1 maurohenriquechagasesilva.pdf: 2211214 bytes, checksum: 7e35d9cec8fd1ce921b9e22dec1b0d8f (MD5) Previous issue date: 2013-06-28 / O objetivo deste estudo foi avaliar “in vitro”, a microinfiltração coronária em cavidades complexas classe II-MOD seladas com materiais restauradores temporários, submetidos à ação de termociclagem e forças mecânicas. Cavidades MOD foram preparadas em 60 pré-molares superiores extraídos de humanos que foram divididos em três grupos de acordo com o material restaurador temporário (MRT) utilizado: G1- IRM; G2- Coltosol; G3- Fill Magic Tempo. Três dentes serviram como controle negativo e não tiveram cavidades preparadas. Antes do selamento das cavidades com o MRT, uma esponja de colágeno foi deixada dentro da câmara pulpar para avaliação binária da penetração do corante. Dez dentes de cada grupo foram submetidos à ação da termociclagem e forças mecânicas oclusais. Em seguida, toda a amostra foi imersa em corante Rodamina B a 0,5% a 37°C, por um período de sete dias, para difusão passiva do corante. Em sequência, os materiais restauradores temporários foram removidos para avaliação da infiltração. Todos os dentes examinados, exceto os controles negativos, apresentaram infiltração pelo corante, manchando a esponja contida na câmara pulpar. Todos os dentes selados com COLTOSOL fraturaram após ensaio mecânico, enquanto que aqueles com IRM e Fill Magic TEMPO mantiveram-se intactos macroscopicamente. Pôde se concluir que nenhum dos materiais testados impediu a penetração do corante. Não houve correlação entre a ação ou não das intempéries térmicas e mecânicas quanto à penetração do corante nas amostras no presente estudo. / The aim of this study was to evaluate "in vitro", the coronal microleakage in complex cavities class II-MOD sealed with temporary filling materials, subjected to the action of thermal cycling and mechanical forces. Cavities MOD were prepared in 60 premolars extracted from humans who were divided into three groups according to the temporary restorative material (MRT) used: G1-IRM; Coltosol-G2, G3-Fill Magic Tempo. Three teeth served as negative control and had no cavities prepared. Before sealing the cavities with the MRT a collagen sponge was left in the pulp chamber to evaluate binary penetration of the dye. Ten specimens of each group were subjected to the action of thermal cycling and mechanical occlusal forces. Then, the whole sample was immersed in the dye Rhodamine B 0.5% at 37 ° C for a period of seven days to passive diffusion of the dye. In sequence, the temporary restorative materials were removed to evaluate infiltration in the collagen sponge. All teeth examined, except the negative controls showed infiltration by the dye, staining the sponge contained in the pulp chamber. All teeth sealed with Coltosol fractured after mechanical testing, while those with IRM and Fill Magic Tempo remained macroscopically intact. Could be concluded that none of the tested materials to prevent dye penetration. There was no correlation between the action or not of the thermocycling and mechanical loading in the dye penetration of the samples in this study.