How nasolabial angle reflects position of maxilla and upper incisors
Journal Title: Forum Ortodontyczne - Year 2008, Vol 4, Issue 6
Abstract
Assessment of patient`s soft-tissue profile is essential in making diagnosis and establishing treatment plan. It includes measurement of the angle between lines tangent to the nasal base and the upper lip contour. [b]Objective:[/b] investigation of correlation between nasolabial angle and position of maxilla (SNA angle) as well as inclination of upper central incisors` axis (1/SN).[b]Materials and methods:[/b] 163 lateral, randomly selected, cephalometric radiographs were investigated. All of them were traced by one investigator with a 0,3 mm pencil on acetate paper. SNA and 1/SN angles were measured. Patients were divided into three groups: with decreased, increased or correct values of NLA, which, following Mc Namara, is 102±8 degrees. To investigate correlation between two measurable parameters, r Pearson correlation coefficient significance test was used. Five per cent interpretation error and related p<0.05 significance level were accepted. [b]Results:[/b] NLA values were within 74 to 147,2 degrees (mean 111,8). Statistically significant correlation between NLA and inclination of upper incisors` axis towards SN line (1/SN) at p<0.05 5 was detected. No significant correlation was found between NLA and SNA angles. Mean NLA value was 110,5 degrees in females and 113,8 degrees in males, which had no statistical significance. [b]Conclusions[/b]: It was pointed out that NLA depends on inclination of upper incisors` axis rather than position of maxilla (SNA). (Orthod. Forum 2008; 4: 167 - 173). Received: 12.06.2008 Accepted: 14.11.2008
Authors and Affiliations
Magdalena Dobrowolska-Zarzycka, Iwona Mitura, Łukasz Sidorowicz
Keywords
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