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Endodontic access of cerestore crowns

1985; Elsevier BV; Volume: 11; Issue: 12 Linguagem: Inglês

10.1016/s0099-2399(85)80202-8

1878-3554

Paul Elliott Teplitsky, J. Kenneth Sutherland,

Dental Implant Techniques and Outcomes

The purpose of this study was to determine the effect of endodontic access opening on cerestore crowns. Fifty-six extracted permanent teeth were selected to be representative of the different tooth types in the human mouth. The teeth were radiographed, coded, and stored in individual containers. Then they were prepared to accept Cerestore crowns and sent to the manufacturer for crown fabrication. The completed crowns were luted to the prepared extracted teeth with Trial cement. Access openings using diamond and carbide instrumentation were completed using established criteria for access preparation. Radiographs were taken showing files to working length(s) with direct access to apical foramina. The crowns were removed and examined foramina. The crowns were removed and examined for fracture lines by direct vision, transillumination, and stereomicroscope. Twelve crowns were examined more closely with the use of scanning electron microscopy. None of the crowns fractured as a result of the stress caused by access opening with diamond instrumentation strumentation under water spray. Although chips and roughness of the ceramic material was evident on the periphery, only one crack was detected with the scanning electron microscope. The purpose of this study was to determine the effect of endodontic access opening on cerestore crowns. Fifty-six extracted permanent teeth were selected to be representative of the different tooth types in the human mouth. The teeth were radiographed, coded, and stored in individual containers. Then they were prepared to accept Cerestore crowns and sent to the manufacturer for crown fabrication. The completed crowns were luted to the prepared extracted teeth with Trial cement. Access openings using diamond and carbide instrumentation were completed using established criteria for access preparation. Radiographs were taken showing files to working length(s) with direct access to apical foramina. The crowns were removed and examined foramina. The crowns were removed and examined for fracture lines by direct vision, transillumination, and stereomicroscope. Twelve crowns were examined more closely with the use of scanning electron microscopy. None of the crowns fractured as a result of the stress caused by access opening with diamond instrumentation strumentation under water spray. Although chips and roughness of the ceramic material was evident on the periphery, only one crack was detected with the scanning electron microscope. El propósito de este estudio fue determinar el efecto de la apertura del acceso endodóntico en coronas de Cerestore. Se seleccionaron 56 dientes permanentes extraídos como representativos de los diferentes tipos de dientes de la boca humana. Los dientes se radiografiaron, codificaron y almacenaron en recipientes individuales. Luego se prepararon para recibir coronas de Cerestore y enviaron al laboratorista para la fabricacíon de las coronas. Las coronas terminadas se cementaron en los dientes extraídos y preparados, con cemento trial. Las aperturas de acceso se completaron usando instrumental de diamante y carburo por medio de criterios establecidos. Las radiografías se tomaron mostrando las limas en la longitud(es) de trabajo con acceso directo a la foramina apical. Se removieron las coronas y se examinaron por líneas de fractura por visión directa, transiluminación y estereomicroscopio. Doce de las coronas se examinaron más minuciosamente con el uso del microscopio electrónico de barrido. Ninguna de las coronas se tracturó como resultado del stress causado por la apertura del acceso con instrumental de diamante bajo rocío de agua. Aunque astillas y rugosidades del material cerámico fueron evidentes en la periferia, sólo una rotura se detectó con el SEM. El propósito de este estudio fue determinar el efecto de la apertura del acceso endodóntico en coronas de Cerestore. Se seleccionaron 56 dientes permanentes extraídos como representativos de los diferentes tipos de dientes de la boca humana. Los dientes se radiografiaron, codificaron y almacenaron en recipientes individuales. Luego se prepararon para recibir coronas de Cerestore y enviaron al laboratorista para la fabricacíon de las coronas. Las coronas terminadas se cementaron en los dientes extraídos y preparados, con cemento trial. Las aperturas de acceso se completaron usando instrumental de diamante y carburo por medio de criterios establecidos. Las radiografías se tomaron mostrando las limas en la longitud(es) de trabajo con acceso directo a la foramina apical. Se removieron las coronas y se examinaron por líneas de fractura por visión directa, transiluminación y estereomicroscopio. Doce de las coronas se examinaron más minuciosamente con el uso del microscopio electrónico de barrido. Ninguna de las coronas se tracturó como resultado del stress causado por la apertura del acceso con instrumental de diamante bajo rocío de agua. Aunque astillas y rugosidades del material cerámico fueron evidentes en la periferia, sólo una rotura se detectó con el SEM.