Microleakage of Different Thickness of Restorative Materials Used in Endodontically Treated Teeth by Dye Penetration

@#This study aimedto evaluate the coronal microleakage of different thickness of different restorative materials (glass ionomer cement (GIC, GC Gold Label 2), composite restoration (SDR, Dentsply Sirona) and (Filtek Z350 XT, 3M ESPE)) used as final restoration in endodontically treated teeth. 72 sound maxillary incisors were used. Following instrumentation, all canals were obturated with gutta-percha (Dentsply Maillefer) and Roth sealer (Roth International Ltd). After 2mm of gutta-percha removal below cemento-enamel junction, the crown was cut until length of 6mm from the gutta-percha to the incisal edge was achieved. The teeth were divided into four experimental groups (n=18) and access restorations were placed in different thickness combinations. Group 1 (G1): 2mm SDR + 4mm Filtek; Group 2 (G2): 4mm SDR + 2mm Filtek; Group 3 (G3): 2mm GIC + 2mm SDR + 2mm Filtek; Group 4 G4): 6mm SDR. All samples were thermocycled (500 thermal cycles between 5o and 55oC and dwell time of 30s), coated with nail varnish leaving 1mm margin around the filling material, immersed in 2% Rhodamine B solution and sectioned longitudinally. The dye penetration was observed under a stereomicroscope (Olympus SZX7) with 1.25x magnification. The data were analysed using Kolmogorov-Smirnov test, ANOVA test and post-hoc Tukey’s HSD test.There was significant difference of microleakage among all groups. G1 showed least microleakage but with no significant difference between G1 and G3 (p=0.513) and G1 and G4 (p=0.477). G2 showed significant microleakage compared to G1, G3 and G4 (p<0.05). In conclusion, sandwich technique between SDR and Filtek reduces microleakage in which the combination of 2mm SDR with 4mm Filtek in G1 had the least microleakage but with additional 2mm of GIC in G3 further reduces the microleakage.

Coronal microleakage of flared root canal teeth restored with CAD/CAM fiber post and core / 实用口腔医学杂志

Objective:To study the coronal microleakage of flared root canal teeth restored with computer aided design and computer aided manufacturing (CAD/CAM)fiber post and core.Methods:60 extracted human mandibular premolars with single canal were divided into 3 groups randomly(n =20).The roots of the teeth were restored with CAD/CAM glass fiber post and core(group A), prefabricated glass fiber post(group B)and gold alloy dowel-and-core(group C)respectively.The specimens were immersed in India ink for 4 weeks.Subsequently all teeth were demineralized,dehydrated and rendered transparent.Then coronal microleakage was ob-served with stereomicroscope.Nonparametric data were analyzed.After that,All the specimens was demineralized completely in nitric acid,Then the interface between the post,resin cement and canal wall was observed and recorded.Results:The microleakage was found in all the 3 groups,group A and C showed less microleakage than group B(P 0.05).Microleakage mostly appeared at the interface between post and resin cement in group A and C,while in group B,it appeared between resin cement and the wall of root canal totally.Conclusion:CAD/CAMfiber post and core demonstrates less coronal microleakage than prefabricated glass fiber post.

Coronal microleakage of restorations with or without cervical barrier in root-filled teeth / Microinfiltração coronária de restaurações com ou sem barreira cervical em dentes endodonticamente tratados

PURPOSE: To evaluate the ability sealing of glass ionomer and composite resin with or without 1-mm thickness of Coltosol on the root-canal filling material. METHODS: Root-canal treatment was completed on 50-extracted human mandibular unirradicular. The teeth were divided into six groups: G1, positive control; G2, negative control; G3, glass ionomer (Vidrion R); G4, Coltosol + Vidrion R; G5, composite resin; and, G6, Coltosol + composite resin. For G1 and G2 five teeth each were used and for the other groups, ten teeth each. The teeth were thermocycled and evaluated for microleakage using methylene blue dye. Specimens were sectioned and measurements made to the maximum point of dye penetration. The mean dye penetration (%) for each group was compared by ANOVA and Tukey's test for post-hoc comparisons (α=0.05). RESULTS: The means and standard deviations of microleakage were: G1, 96.56 (±2.31); G2, 0.00 (±0.00); G3, 68.76 (±24.63); G4, 24.42 (±8.33); G5, 20.06 (±9.35); and, G6, 12.86 (±6.08). CONCLUSION: It was concluded that none of the materials were able to prevent microleakage. Composite resin alone or combined with coltosol and glass ionomer associated with coltosol resulted in less microleakage than the glass ionomer used alone.

OBJETIVOS: Avaliar a capacidade de selamento do ionomero de vidro e resina composta, com ou sem 1 mm de coltosol, sobre o material obturador endodôntico. MÉTODOS: O tratamento endodôntico foi realizado em 50 dentes humanos mandibulares unirradiculares. Os dentes foram divididos em 6 grupos: G1, controle positivo; G2, controle negativo; G3, ionômero de vidro (Vidrion R); G4, Coltosol + Vidrion R; G5, resina composta; e, G6, Coltosol + resina composta. Os dentes foram submetidos a termociclagem e a avaliação da microinfiltração usando azul de metileno. Os especimes foram seccionados e a quantidade maxima de penetração de corante avaliado. As medias e desvios-padrão de penetração do corante (em %) para cada grupo foram analisadas pelo teste ANOVA e pelo teste de multiplas comparações de Tukey's (α=0.05). RESULTADOS: As medias e desvios-padrão de midroinfiltração foram: G1: 96,56 (±2,31); G2: 0,00 (±0,00); G3: 68,76 (±24,63); G4: 24,42 (±8,33); G5: 20,06 (±9,35); and,G6: 12,86 (±6,08). CONCLUSÃO: Pode-se concluir que nenhum material obturador preveniu completamente a microinfiltração. Resina composta utilizada isoladamente ou associada ao coltosol e o ionômero de vidro associado ao coltosol apresentaram menor microinfiltração do que o ionomero de vidro utilizado sozinho.

Efecto de algunas técnicas utilizadas en la realización del tratamiento de conductos radiculares en la microfiltración coronaria (revisión de la literatura)

La microfiltración coronaria se considera una de las causas de fracaso de los tratamientos de conductos radiculares. La falta de sellado coronario permite la penetración desde la cavidad bucal de microorganismos y sus productos que podrían eventualmente llegar al foramen apical. Numerosos estudios han evaluado el efecto de algunos procedimientos realizados durante el tratamiento de conductos radiculares sobre la microfiltración coronaria, entre ellos: La remoción o no de la capa de desecho, la utilización de diversos cementos selladores y diferentes técnicas de obturación. En la revisión de la literatura realizada se observó que la remoción de la capa de desecho pareciera reducir la microfiltración coronaria. En cuanto a la capacidad de sellado y efecto antimicrobiano de los diversos selladores de conductos radiculares los resultados son variados aunque hay una tendencia a una mejor capacidad de sellado por parte de selladores a base de resina compuesta. Ninguna técnica de obturación pareciera prevenir la microfiltración coronaria al ser expuesta la obturación a la saliva.

The microleakage is cause of endodontic failure. The lack of seal coronal exposure the coronal gutapercha to bacterial contamination, this can lead to the migration of bacteria and products to the apex. Numerous studies have evaluated the influence the removal of the smear layers befor obturation, materials of obturation the root canal system and different techniques of obturation on the microleakage coronal in teeth root canal treatment In this revise literature the removal of the smear layers appearance to reduce the microleakage coronal. The results of ability of seal the cements were variable and that not any the techniques of obturation were ability for prevent the microleakage coronal when obturation exposed to saliva.

A in vitro study of coronal microleakage of different post and cement systems / 实用口腔医学杂志

Objective: To compare the coronal sealing abilities of different post and cement systems through measuring the value of leakage by using dye method. Methods: Fifty human mandibular premolars with single canal were divided into 6 groups randomly. A group: roots sealed by temporary material, B group: roots restored with fiber post adhered with composite resin cement, C group: roots restored with casting metal post and core adhered with composite resin and zinc phosphate cement, D group: positive control, E group: negative control. After finishing preparation and restoration of roots, microleakage was determined by using dye method. Results: The groups restored with any post and core system produced significantly less microleakage than temporary material sealing group(P<0.05). But no differences were detected between two groups bonded with the composite resin cement (P>0.05). Posts adhered with zinc phosphate luting agent produced more leakage than those with composite resin cement(P<0.05). Conclusion: Luting agent can decrease the coronal microleakage. Composite resin cement provides better sealing ability.

Microfiltración coronaria in vitro de streptococcus mutans, a través de tres cementos provisionales en dientes tratados endodóncicamente / Microfiltration coronary mutans streptococci in vitro, through three cements endodontically treated teeth interim

La microfiltración coronaria se considera una causa del fracaso de los tratamientos de conductos radiculares. El propósito de la presente investigación in vitro, fue evaluar la capacidad para prevenir la microfiltración coronaria de Streptococcus mutans de IRM®, Cavit®, ionómero de vidrio GC Fuji I® en dientes tratados endodóncicamente, durante un período de 90 días. Se realizó un diseño experimental con 40 dientes humanos extraídos, cortados coronariamente a una longitud radicular de 14mm, cuyos conductos fueron preparados, obturados con gutapercha y sellador con técnica de condensación lateral, previa remoción de la capa de desecho. Las cavidades de acceso fueron estandarizadas, a una profundidad de 4mm. La muestra se dividió en: Grupo Experimental: 30 dientes (10 por material de obturación provisional) y Grupo Control: 10 dientes (5 control positivo, 5 control negativo). Se utilizó un sistema de filtración con doble cámara. La cámara inferior se evaluó diariamente para observar la turbidez del caldo de cultivo y establecer la presencia y el día de la filtración. Las muestras del control positivo filtraron los primeros 7 días, el control negativo no mostró filtración. El grupo "IRM" mostró un 100 por ciento de muestras filtradas, el grupo "CAVIT" un 60 por ciento y el grupo "FI" un 40 por ciento. El promedio de días para la filtración de los grupos "IRM", "CAVIT" y "FI" fue 25,4 , 28,67 y 56,75 respectivamente. Se concluyó que el material de obturación provisional que mostró mayor capacidad para prevenir la microfiltración coronaria fue el ionómero de vidrio

The coronal microleakage is cause of endodontic failure. The purpose of this study in vitro was to evaluate the ability of IRM®, Cavit® and glass ionomers GC Fuji I® to prevent the coronal leakage of S. mutans in endodontically treated teeth to 90 days. Forty intact extracted human teeth were coronally shortened to a uniform length of 14 mm. The root canal were prepared and obtured with sealer and gutapercha with lateral condensation. The dentinal smear layer was removed before obturation. Standardized access cavities to 4mm depth. The teeth were divided in two groups: Experimental group (30 teeth) and Control group (10 teeth). The teeth were placed into a coronal leakage apparatus that contained an upper and lower chamber, daily observations were made for bacterial growth and for determine the length of time for the bacteria to penetrate complete of canal root. All positive control teeth showed bacterial penetration in the first 7 days, while the negative control teeth no showed contaminatied thoughout the test period. The groups "IRM" showed 100 percent leakage, "CAVIT" 60 percent and "FI"40 percent . The mean measure days for group "IRM", "CAVIT" and "FI" were 25,4 , 28,67 and 56,75 respectivement

Microfiltración coronaria en dientes tratados endodóncicamente: revisión de la literatura / Microfiltration coronary endodontically treated teeth: review of the literature

La microfiltración coronaria es considerada una causa de fracaso de los tratamientos de conductos radiculares. Es un término que se refiere a la contaminación con saliva de los conductos radiculares. Se han realizado numerosos estudios que demuestran la incapacidad de los materiales de obturación de los conductos radiculares para prevenir la microfiltración coronaria. También se señala en la literatura, la necesidad de la utilización de materiales de obturación provisional de la cámara de acceso para reducir o prevenir dicha microfiltración. Sin embargo, la capacidad de sellado de estos materiales, evaluada en numerosos estudios, han mostrado resultados muy variados, de allí la necesidad de la restauración inmediata de los dientes tratados endodóncicamente

The coronal microleakage is cause of endodontic failure. Contamination of root canal by saliva, referred to as coronal microleakage. Numerous studies have reported that the root filling materials cannot be prevented coronal leakage. Contamination should be prevented by employing adequate of the temporary materials restaurative, but studies that evaluated the sealing properties of temporary restaurative materials, have shown very variation in the resultate. Once root canal treatment is completed, immediate restoration of the tooth is recommended whenever possible