Compensation trends of the angulation of first molars: retrospective study of 1 403 malocclusion cases
| Autor: | Wen Ma, Tian-Min Xu, Bin Na, Hong Su, Bing Han, Sa Li |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Molar
Adult Male sagittal skeletal patterns Dentition Mixed Adolescent Cephalometry Dentistry Malocclusion Angle Class I Mandible Malocclusion Angle Class II angulation Mandibular first molar vertical skeletal patterns compensation Cohort Studies Young Adult stomatognathic system first molar medicine Maxilla Humans Child Maxillofacial Development General Dentistry Retrospective Studies Orthodontics Dentition business.industry Palate Age Factors Retrospective cohort study malocclusion Craniometry Middle Aged medicine.disease Malocclusion Angle Class III Angle classification growth stages Original Article Female Malocclusion Anatomic Landmarks business |
| Zdroj: | International Journal of Oral Science |
| ISSN: | 2049-3169 1674-2818 |
| Popis: | We investigated the compensatory trends of mesiodistal angulation of first molars in malocclusion cases. We compared differences in the angulation of first molars in different developmental stages, malocclusion classifications and skeletal patterns. The medical records and lateral cephalogrammes of 1 403 malocclusion cases taken before treatment were measured to evaluate compensation of molar angulation in relation to the skeletal jaw. The cases were stratified by age, Angle classification and skeletal patterns. Differences in the mesiodistal angulation of the first molars were compared among the stratifications. We observed three main phenomena. First, angulation of the upper first molar varied significantly with age and tipped most distally in cases aged 16 years. The lower first molar did not show such differences. Second, in Angle Class II or skeletal Class II cases, the upper first molar was the most distally tipped, the lower first molar was the most mesially tipped, and opposite angulation compensation was observed in Class III cases. Third, in high-angle cases, the upper and lower first molars were the most distally tipped, and opposite angulation compensation was observed in low-angle cases. These data suggest that the angulation of the molars compensated for various growth patterns and malocclusion types. Hence, awareness of molar angulation compensation would help to adjust occlusal relationships, control anchorage and increase the chances of long-term stability. |
| Databáze: | OpenAIRE |
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