American Journal of Orthodontics and Dentofacial Orthopedics
Original ArticlesSeven parameters describing anteroposterior jaw relationships: Postpubertal prediction accuracy and interchangeability☆
Section snippets
Material and methods
The present analysis was made with pairs of lateral cephalograms of 44 Japanese subjects (20 males and 24 females) obtained from the files of the Longitudinal Craniofacial Growth Study at Hokkaido University Dental School.20 All subjects had clinically acceptable occlusions with a Class I molar relationship, mild or no anterior crowding, and overbite and overjet ranging from 1 to 5 mm. None had undergone orthodontic therapy. For the assessment at prepubertal and postpubertal stages,
Results
The combined error for the angular measurements ranged from 0.17°(the ANB angle) to 0.30°(the APDI). The Wits appraisal and the AF-BF distance showed the measurement error of 0.35 mm and 0.32 mm, respectively.
Table II gives the means and SD of the cephalometric measurements of the 7 jaw relationship parameters for each of the 4 groups.
Empty Cell Male Female Prepubertal Postpubertal Prepubertal Postpubertal Mean SD Mean SD Mean SD Mean SD AB plane
Discussion
The ANB angle and the Wits appraisal are the most commonly used parameters among measurements related to anteroposterior jaw relationships. The validity of these parameters has been investigated by many studies. Jacobson2, 5 showed that the ANB angle does not provide an adequate assessment of jaw relationships because rotational growth of the jaws and the anteroposterior position of nasion influence the ANB angle. Hussels and Nanda8 noted 2 additional factors affecting the ANB angle, the
Conclusions
Seven jaw relationship parameters were measured on pairs of lateral cephalograms of 44 normal occlusion subjects to evaluate prediction accuracy of future relationships by each parameter and interchangeability among the parameters. In the prepubertal assessment, the ANB angle and the angle of convexity showed better prediction accuracy for postpubertal jaw relationships. Higher interchangeability among the parameters was substantiated between the SN-AB angle and the AF-BF distance, as well as
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Reprint requests to: Hiroyuki Ishikawa, Department of Orthodontics, School of Dentistry, Hokkaido University, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan; e-mail, [email protected]