Height of the alveolar process in patients with normal vertical facial relationships
Journal Title: Forum Ortodontyczne - Year 2009, Vol 5, Issue 1
Abstract
Inclination angle between mandibular plane (ML) and anterior cranial base plane (SN) affects anterior lower face. In skeletal open bite elongation of posterior teeth and alveolar process is observed. [b]Aim: [/b]determination of posterior height of maxillary and mandibular alveolar process in subjects with normal vertical relationships of face in profile cephalographs. [b]Material[/b]: consisted of 300 lateral cephalometric radiographs of patients with Class I malocclusion and correct vertical facial proportions. Two groups were distinguished: 213 subjects with mixed and 87 with permanent dentition. [b]Method[/b]: Distance between the tip of first upper permanent molar`s mesiobuccal cusp and its projection onto maxillary plane (ms- NL) was measured in millimetres, so was the distance between the tip of first lower permanent molar`s mesiobuccal cusp and mandibular plane (mi-ML). The measurements were compared with study results obtained from other populations. [b]Results[/b]: SN/ML angle was 27º to 36º (mean 32º ± 3.03º in mixed and 32º ± 3.14º in permanent dentition). Distance between first upper molar`s cusp and maxillary plane (ms-NL) increased with age from 20.0 mm in mixed to 23.0 mm in permanent dentition. Distance between the lower molar and mandibular plane increased similarly and was 28.5 mm in deciduous and 31.0 mm in permanent dentition. [b]Conclusions[/b]: 1. Mean SN/ML angle was 32 degrees in both permanent and deciduous dentition. 2. ms- -NL and mi-ML measurement increased with age, approximately by 3 mm in population. Norms for posterior teeth and alveolar process hight should be assessed in mixed and permanent dentition. (Orthod. Forum 2008; 5: 5 - 10). Received: 5.01.2009 Accepted: 20.03.2009
Authors and Affiliations
Monika Smyl-Golianek, Magdalena Leszcz, Izabella Dunin-Wilczyńska
Keywords
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