Int J Stomatol

Inter J Stomatol ›› 2010, Vol. 37 ›› Issue (02): 154-154～156.doi: 10.3969/j.issn.1673-5749.2010.02.008

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The correlation between temporomandibular joint maturity and second molar root de

LIU Yuan-yuan, WANG Hu, YANG Zhen-yu, BA Kai, LI Ming-xia, LIU Li   

  1. Dept. of Oral Radiology, West China College of Stomatology, Sichuan University, C
  • Received:2009-08-23 Revised:2010-01-06 Online:2010-03-20 Published:2010-03-20
  • Contact: WANG Hu

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Abstract: Objective To study temporomandibular joint（TMJ） on the radiographs before orthodontic treatment in adolescents and analyze the correlation between TMJ maturity and second molar root development. Methods 52 adolescents aged 12-14 were chosen. The panoramics and lateral Schüller projections were collected, through which the bone maturity of TMJ and the development of second molar root could be made. The maturity rating about TMJ and second molar root development was established respectively. And then the correlation analysis was done. Results The general trends of the developments of three parts of TMJ were the same, in which the correlation coefficient between articular eminence and articular fossa was 0.709. The development of second molar root especially closely related with the maturity of the condyle, because the correlation coefficient between the two parts was 0.576, comparatively the correlation coefficient between second molar root and eminence or fossa were 0.064 or 0.091. Conclusion TMJ in adolescents is just at the maturing stage, but the degree of the development is not consistent in the same age level. The development of second molar root can be used to describe the condyle maturity according to the close relationship between the both in radiograph.

Key words: adolescent, radiograph, temporomandibular joint, second molar root

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