上顎無歯顎歯槽堤の形態的特徴

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The principles for taking impressions of full dentures are to record the basal tissue as wide as possible and to mold the border in harmony with the surrounding dynamics. In order to perform such complicated impression taking properly, morphology of the alveolar ridge must be grasped well and suitable trays must be used. Therefore, maxillary edenturous models obtained through functional border molding were examined for morphological characteristics. The results were as follows : 1. Length and width of the alveolar ridge arch and length of HIP were 46±3mm, 48±4mm, and 52±3mm, respectively. 2. Significant correlation (r=0.83) was found between length of the alveolar ridge arch and length of HIP, but no significant correlation was found between length and width of the alveolar ridge arch (r=0.12) or between length of HIP and width of the alveolar ridge arch (r=0.28). 3. Classification of the morphology of the maxillary alveolar ridge into round type, U-shaped type, and square type was 17.5%, 66.7%, and 15.8%, respectively, in frequency of appearance. 4. Width of the alveolar ridge arch and height and radius of the palate at the maxillary first molar region were 47±3mm, 11±2mm, 32±5mm, respectively. On the basis of the foregoing findings, conventional measuring of the length between the left-right hammular notches or HIP length is insufficient in selecting commercially available trays. It is confirmed that paying attention to morphological characteristics is requiered.
1987-04-25

上顎無歯顎歯槽堤の形態的特徴

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