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KMID : 0358920050320020270
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Journal of the Korean Academy of Pedodontics
2005 Volume.32 No. 2 p.270 ~ p.277
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THE PALATAL MORPHOLOGY OF THE CHILDREN WITH CLASS Ⅱ DIV.1 MALOCCLUSION IN MIXED DENTITION : A STUDY USING THREE-DIMENSIONAL LASER SCANNER
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Yang Jung-Hyun
Lee Sang-Hoon
Hahn Se-Hyun
Kim Chong-Chul
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Abstract
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The purpose of this study was to clarify the palatal volume and anterior palatal slope of the children with class Ⅱ div. 1 malocclusion and normal occlusion in mixed dentition(Hellman dental age ⅢA) using three-dimensional laser scanner.
Samples were consisted of 31 children with skeletal class Ⅱ div.1 malocclusion in mixed dentition and 29 children with normal occlusion and profile among the contestants in 2000-2004 Healthy Dentition Contest in Seoul. Totally 60 maxillary study model were taken. Each cast was scanned by three-dimensional laser scanner (Breuckmann opto-TOP HE, INUS, Korea) and shaped into the three-dimension image by Rapidform 2004 pro￢gram(INUS, Korea). And the palatal volume and anterior palatal slope of each cast were calculated by Rapidform 2004 program(INUS, Korea). The values were statistically compared and evaluated by independent samples t-test with 95% of significance level.
The results were as follows:
1. Palatal volume was significantly lesser in children with class Ⅱ div.l malocclusion than that of normal occlusion in mixed dentition(p<0.05).
2. No significant difference in the anterior palatal slope and palatal height was found between the children with class Ⅱ div.1 malocclusion and normal occlusion in mixed dentition(p>0.05).
3. Palatal length was significantly greater in children with class Ⅱ div.1 malocclusion than that of normal occlusion in mixed dentition(p<0.01).
4. Intercanine and intermolar width were significantly lesser in children with class Ⅱ div.1 malocclusion than those of normal occlusion in mixed dentition(respectively p<0.05 and p<0.01).
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KEYWORD
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Palatal volume, Anterior palatal slope, Three-dimensional laser scanner, Mixed dentition
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