Abstract
In cases of traumatized young permanent incisors, the frequency of luxation is high, and the development of splinting methods in recent years has preserved more of these teeth. The present study is a clinical and radiographic investigation of 66 luxated young permanent incisors.
The mean observation period was 2.5years. The results are summarized as follows.
1) Obliteration of the pulp cavity was found in 25 teeth, and pulp necrosis was found in 8 teeth. Obliteration was found mostly in periods of observation under 1 year. Pulp necrosis was found mostly in periods of observation about 1 month.
2) Obliteration of the pulp cavity occured more frequently in teeth with partially developed roots, and pulp necrosis more in teeth with fully developed roots.
3) Dividing the prognoses of these teeth by the type of luxation, good cases were found more frequently among concussion and subluxation, pulp obliteration cases were among extrusion and lateral luxation, pulp necrosis cases were among intrusion.
4) Anomalies of the root development were found in 33 cases, and 2 of them seemed to be ankylosis teeth.
