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Original Article

Molar extraction and mandibular rotation. Effects and stability

2001, Volumen 31, Número 4
José María Llamas Carreras
Profesor Asociado Ortodoncia. Facultad Odontología. Universidad de Sevilla. Sevilla

48 class II open bite long face patients were analyzed before and after treatment as well as after a retention period of at least three years. The sample consisted of individuals whom the treatment had included first molars extraction. All patients were older than 15 years of age, with a mean age of 16.3 years. In all cases, the retention period exceeded 3.5 years. The sample was divided into 2 subgroups. The stable group consisted of 11 individuals showing excellent dental and occlusal stability, checked in the mouth and in the dental casts. The rest of the patients conformed the normal group. Variables analyzed confirmed the decrease of the sagittal jaw relation, as well as the expected forward mandibular rotation. Concerning retention findings we have no optimism. A posterior rotation occurred which brought this jaw to a similar spatial relationship as recorded before treatment. This behaviour was not different when comparing the stable and the normal groups. Thus, it does not support the suggestion about dentoalveolar importance for skeletal mandibular rotation stability.  (Rev Esp Ortod. 2001;31(4):299-308)

Key words:
Molars. Extraction. Stability.
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