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See: hiatus, rend, rift, split
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Fiber reinforced posts reduce the risk of root fracture and are the best choice in reconstruction of the endodontically treated teeth.
The titan post and ceramic post produces the greatest stress concentration at the post/dentin interface (Figure 4), which predispose to vertical irreparable root fractures.
0) Lateral luxation 0 0 0 Root fracture 0 0 0 Uncomplicated 0 0 0 crown-root Total (%) 20 (27.
2002] in their study on sheep teeth concluded that it was indeed the high pH of NSCH that caused proteolysis and weakened the dentine by up to 50% that might lead to root fracture.
A radiographic examination revealed a horizontal root fracture at the level of the middle third of 21 (Figure 3a).
The immediate treatment was reimplantation and splinting of the avulsed 21 and the root fracture avulsion of 11 (Figures 1a-d and 2a-d).
Age, stage of root development, mobility and dislocation of the coronal fragment, diastasis between fragments and sex were found to be significantly and positively related to both pulpal healing and hard tissue repair of the root fracture [Andreasen et al.
Other less common causes include retained roots, vertical root fractures and pericoronitis.
Broken teeth - chipped teeth, fractured teeth, cracked teeth - and loosened or knocked out teeth are classified into the following basic types listed in order of severity: crown fractures, root fractures, displaced or loosened teeth.
Nevertheless any avulsed teeth that were lost at the time of the accident, had a short follow-up period, were lost to follow-up, had root fractures, had been autotransplanted, or had sustained subsequent trauma after replantation were all excluded from the study.
In the latest years there have been developed new techniques and materials for PCS: ceramic posts (cast or prefabricated), and composite posts reinforced with different kind of fibers: carbon, glass, quartz, silica, in order to replace the metallic posts wich have a lot of disadvances: poor esthetics and biocompatibility (the migration of metallic ions from the post's alloy in the oral tissues is well known, high Young modulus that increase the risk of catastrophic (irreversible) root fractures, followed by the tooth's extraction (Rosentrit et al.