Clinical significance and design of the curved osteotomy line on mandibular angle / 重庆医学

ABSTRACT

Objective To design safe and beautiful curved osteotomy line for mandibular angle osteotomy .Methods Expo‐sing 150 cases(300 sides) of mandible tube in the mandible bone of adults;Observing the characteristics of the movement of man‐dibular canal;measuring the distance from the critical dot of mandibular canal to marginal mandibular ;observing the positional rela‐tionship between mandibular foramen and the inferior alveolar arch;designing the curved osteotomy line based on observations to meet the individual needs .Results T he distance betw een the key points of mandibular canal A1 ,B1 ,C1 ,and D1 ,E1 and the mandib‐ular edge come as (14 .02 ± 2 .23)mm ,(21 .06 ± 3 .90)mm ,(14 .08 ± 3 .68)mm ,(13 .60 ± 2 .80)mm ,(14 .55 ± 3 .34)mm ,respective‐ly ;the maximum width each were (10 .05 ± 4 .00)mm ,(15 .06 ± 2 .88)mm ,(8 .08 ± 3 .88)mm ,(6 .09 ± 3 .45)mm ,(7 .06 ± 3 .56) mm ;the probability that mandibular foramen and inferior alveolar of the bow was located in the same plane falls on 96% ;the rear end of the point A of the osteotomy line should not be higher than the plane of the lower jaw holes ,the front point of three osteoto‐my line C ,D ,E ,fall respectively on the point intersection where the vertical line led downward via the edge of the ramus ,the man‐dibular teeth M2 ,P4 met the marginal mandibular .Conclusion The design of curved osteotomy line for mandibular angle osteotomy meets the individual needs ,in line with the anatomical features and aesthetic requirements which takes the advantages as easy‐opera‐tion with clear signs ,high security and preferable effect after operation .