Relationship between formation and eruption of permanent mandibular buccal dentition and vertical height of the mandibular body: longitudinal study of Japanese boys from 4 to 9 years of age.

Aim: To examine the relationship between the formation and eruption (vertical tooth movement in and through the alveolar bone) of the permanent mandibular buccal dentition and vertical height of the mandibular body.

Method: Mandibular morphology and tooth formation and eruption were analyzed from cephalograms taken annually on each birthday month from 4 to 9 years of age.

Results: From 4 to 6 years of age, before active tooth eruption, there was a significant positive correlation between the vertical height of the mandibular body and the distance from the permanent mandibular buccal dentition to the occlusal plane.

Three cases of anterior maxillary osteotomy under orotracheal intubation.

Anterior maxillary osteotomy is frequently applied to skeletal Class II cases with maxillary protrusion. In addition to the anteroposterior problem, these cases are often accompanied with a long midfacial appearance and display of incisors and gingiva during smiling. In the application of anterior maxillary osteotomy to such patients, it is necessary to move the anterior maxillary segments upward as well as backward.