11/20/2023 0 Comments Sybron endo obturation![]() ![]() ![]() In cases where posterior teeth have lost a marginal ridge, cuspal coverage restorations are recommended this is carried out in order to prevent fracture 13 and thereby increases the possibility of tooth survival. The quality of this seal is of paramount importance as it has been shown that treatment outcomes can be significantly affected, 12 with better healing rates exhibited in teeth with satisfactory restorations. 11 This suggests that the provision of a suitable coronal seal at the earliest possible opportunity decreases the risk of coronal leakage. It has been demonstrated that, no matter how successfully obturation is carried out, root canals lacking a satisfactory coronal seal will leak within a short time of completion. Interestingly, however, its use in retreatment cases has been shown to have a positive effect on treatment outcome. While the use of EDTA has been recommended for the removal of the smear layer formed during debridement of the root canal 9 there is no existing evidence to support its use in primary root canal treatment. 8 However, if one cannot achieve a dry root canal system that is free from blood or exudate, then the suggested course of action would be to dress the tooth with an inter-appointment dressing. Obturation should only be carried out following thorough chemo-mechanical debridement of the root canal system 7 and, if the root canal system is dry and time permits, obturating at the same visit is recommended. The timing involved with obturation raises the issue of single versus multiple visit treatment. Prevent periapical or periodontal fluids percolating into the root canals and feeding microorganismsĮntomb any residual microorganisms that have survived the debridement and disinfection stages of treatment, in order to prevent their proliferation and pathogenicity. Prevent coronal leakage of microorganisms or potential nutrients to support their growth into the dead space of the root canal system The establishment of a well obturated system would serve three main functions: 6 While a perfect airtight or hermatic seal is unachievable in reality, every effort should be made to reach this target. The aim of obturation is to establish a fluid-tight barrier with the aim of protecting the periradicular tissues from microorganisms that reside in the oral cavity. However, it is important to recognise that the responsibility does not end here the coronal seal forms an integral part of endodontic treatment and therefore plays a vital role in the treatment's success. ![]() 2, 3 The obturation stage is carried out to fill the root canal 4 in an attempt to provide a hermetic seal from the coronal orifice of the canal to the apical foramen at the cemento-dentinal junction. The removal of microorganisms is primarily achieved during the debridement and disinfection stages of treatment. 1 The elimination of microorganisms and their by-products is, therefore, the key to success. Since the seminal research by Kakehashi in 1965, the role of microorganisms and their by-products has been demonstrated countless times as the main causative factor in the aetiology of apical periodontitis. When the pulp is rendered non–viable, root canal treatment attempts to fulfil its aim by debridement, disinfection and obturation of the root canal system. The ultimate biologic aim of root canal treatment is the prevention or cure of apical periodontitis.
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