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Abstract
Endodontic practice and its success have been inextricably tied to the quality of the final restoration although not the primary cause for failure, tooth fracture may be most detrimental because it often results in extraction. Therefore, the fracture of restored teeth is a significant problem which warrants further study, this condition is more important in endodontically treated teeth because when compared with teeth with healthy pulps root filled teeth are considered more susceptible to fracture.
Controversy exists regarding the best type of final restoration of these teeth, the scientific literature provides numerous, primarily material oriented incomparable and thus possibly confusing in vitro studies regarding the final restoration of endodontically treated teeth.
Therefore in our present study, the reinforcement of endodontically treated teeth by various all ceramic restorations and systems was investigated by measuring the fracture resistance of these teeth under laboratory conditions. The origin and mode of fracture were investigated as well using scanning electron microscopy.
Two different types of restorations, intra-coronal (In/onlays) and extra-coronal (crowns) restorations were used.
The recent innovation of high strength all ceramic systems together with the increased esthetic demands among patients even in posterior areas, encourage the selection of two of these systems namely machinable (CEREC) and pressable (Empress II) ceramics, for our study.