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KMID : 0988420030150040331
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Journal of Dental Science (C.N.U.)
2003 Volume.15 No. 4 p.331 ~ p.342
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Comparison of Lateral Cephalometric Characteristics between Dental PRotrusion and Crowding Individuals
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Abstract
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The purpose of this study was to examine the difference of lateral cephalometric charateristics between dental protrusion and crowding individuals and to find out the possible etiologic factors of each malocclusion.
Twenty nine dental protrusion and twenty two crowding individuals were selected from the 4,500 patient records. The tooth size was measured from central incisor to first molar using diagonstic study cast and was compared between two groups. After tracing the lateral cephalometric radiographs, measurements for skeletal factor, hyoid bone position, and incisal position were identified.
The means and standard deviations of the measurement of each group were calculated and compared between two groups. Through the comparison of the measurement between two groups, following results were obtained
1. As a result of comparing the tooth size of dental protrusion group with that of crowding group, there was no significant difference between two groups.
2. In the comparison of skeletal measurements, S-N, A´-Ptm´, SNA, ANB, and facial convexity of protrusion group showed greater value than crowding group.
3. The measurements of hy-PP and hy-MP showing vertical position of hyoid bone were smaller in protrusion group than those in crowding group.
4. The measurement of hy´-Go showing anteroposterior position of hyoid bone was larger in protrusion group than that in crowding group.
The results of the present study showed that dental protrusion inidviduals had the tendency of maxillary protrusion and antero-superior position of the hyoid bone compared to crowding individuals, and these features could be explained as possible etiologic factors of dental protrusion or crowding malocclusion.
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