Tooth fractures - factors influencing fracture risk
Mechanical characteristics are not vital dentin: for a long time endodontically treated teeth seemed more fragile due to loss of moisture. Several studies have investigated the mechanical properties of dentin in the vital against the useless teeth. Although moisture content not vary significantly, the compressive and tensile strength not show any significant differences (28). Thus, factors other than dentin features may be more important in the increased fracturing susceptibility end-odontically treat teeth.
The number of remaining tooth, tooth loss in endodontically treated tooth much more responsible for their higher susceptibility to breakdown than changes in its mechanical properties. Lateral teeth intact limit ranges, and only little access to training are the most resistant to destruction and not much weaker than the intact teeth without any training. Of prosthodontic the point of view of the maximum internal structure of the tooth should be maintained to minimize the risk of fractures.
Thus, ideally, access will be minimal, soE. large enough to get access to the channel. From this point of view the preparation of the canal, especially in the neck, should be as small as possible. This prosthodontic desires in conflict with the modern concepts for preparation of root canal
in endodontic therapy, where direct access to the channel with wide access to open a good overview is the main requirement. Well cervical burning in addition, it is recommended to ensure optimum apical training, especially in curved channels. In more sophisticated treatment of the root channel, you need to sacrifice a tooth, while in almost direct channels of saving the tooth can be the primary goal.
In prosthodontic reconstruction defines the forces acting on the tooth. The size of the tooth on the left, after preparation determines its ability to carry the load. What type of reconstruction is best suited for the remaining tooth must be judged in the beginning of the treatment.
When one or both near-wall had lost a tooth greatly weakened because of the assistance of the district limit ranges (and the roof of the pulp chamber) is lost and horizontal force on the threshold of the acts longer arm-in-arm along the weakest part in the cervical area, usually just above the alveolar ridge. When a force acts on the oblique inner slopes of the doors it will be divided into vertical and horizontal component, the latter has a higher voltage in the weakest part of the cervix. Therefore, the effective bonding or cuspal coverage is a necessary, if the proximal wall is lost and shutters are not flat, due to abrasion or anatomical form. ..