[Contribution of orthodontic extrusion to conservation of teeth].
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Of twenty-five cases presented here, eighteen were boys and seven were girls who required apexification through December 1986. Nine teeth were considered treatment failures after a 9.5-year follow-up period. With these nine cases, however, five teeth to date have had successful endodontic treatment. Additional follow-up time (5-8 years) is required to evaluate the final outcome of pulp canal therapy applied in cases of traumatized maxillary permanent incisor teeth, with incomplete root formation.
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Sharp-pointed full metal-jacketed bullets fired from assault rifles are expected to have a low tendency of deformation or destruction within biological tissues. In principle this also should apply to small calibre projectiles .223. If a bullet penetrates the oral region, contact with teeth can cause early break up and even total disintegration of the projectile. Under such circumstances the fragments are possibly retained within the body. A case of accidental gunshot injury to the head inflicted with an assault rifle AUG Steyr. 223 of the Austrian army serves to demonstrate and discuss the wound ballistic effects in relation to the altered behaviour of the projectile. Analogous findings were reproduced in experimental models.
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The consequences of primary tooth intrusion to the permanent successors are as follows: internal white enamel hypoplasy, external white or yellow-brown enamel hypoplasy, crown dilaceration and root angulation. Questions of therapy have also been discussed.