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KMID : 0370819950100010011
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Yonsei Journal Dental Science
1995 Volume.10 No. 1 p.11 ~ p.28
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A Study of Relationship Between Facial Skeletal pattern and Dental Arch According to Sn-Mp Angle
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Abstract
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Factors other than arch lenght discrepancy must be considered in decision of extraction of teeth as a part of treatment. Such as a facial skeletal pattem. The relationship between facial skeletal pattern and dental crowding has been reported that
high
mandibular plane angles had increased crowding and decreased arch width and opposite finding for low mandibular plane angles
As different environmmental and functional factor in each race an affect relationship between facial skeletal pattern and dental arch. racial characteristics shoud considered. The relations of the facial pattern to malocclusion, method of
treatment, and
prognosis of treatment have been recognized but few have been measured.
The present study is to examine the relationship between facial skeletal pattern and dental arch size, dental crowding, incisor inclination, and anteroposterior position of denture relative to the cranial base according to sellar
nasion-mandibular
plane
angle(SN-MP angle). 3 groups as high SN-Np angle group (SN-MP angle greater than 38°). Average SN-MP angle less than 26°) was selected with 20 subjects each. Each subjects has a second molar fully erupted, and not exposed to orthodontic
treatment.
For each groups, cephalometric and dental cast measurements were carried out and the followign results were obtained.
1. In maxillary arch measurements, hgigh SN-MP group had decreased arch perimenter, interpremolar width, intermolar width, basal arch width, S to U6, and U1 to SN and increased arch length discrepancy and U1 to A-Pog compared to low SN-MP group.
(P<0.05)
2. In mandibular arch measurement, hight SN-MP group had decreased intermolar width, IMPA, and increased arch lenght discrepancy compared to low SN-MP group. (P<0.05).
3. AS arch length and interpremolar with increase, arch perimeter increase.
4. Withan increases in SN-MP angle, posterior location of maxillary first molars to cranial base, decreases of arch perimeter, interpremolar with, intermolar width, and maxillomandibular incisor inclination to SN plane and mandibular plane, and
increases of arch length discrepancy are observed.
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KEYWORD
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