Reciprocal plane の設定喜寿に関する研究 : 第1報歯冠の解剖学的条件に基づく垂直径について

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When the denture base is lifted up by the functional force, the clasp arm moves up on the tooth surface and the deformation of the clasp arm makes the retentive force until the clasp arm reaches at surveyline. But, the tooth contour of the abutment tends to be very flat at near about surveyline. Therefore it is necessary to get more retentive force while to permit less axial displacement of the clasp arm to amount of the standard undercut. It produces a better retention to make the reciprocal plane which is prepared on the proximal surface of abutment tooth in order to be contacting during axial displacement of the clasp arm. Planning standard for reciprocal plane is examined with 67 cases of lower premolar abutment corresponding the effective axial displacement for exerting the retentive force. Results 1. When "I" bar may apply to the abutment which has the undercut of more than 1/4 mm on the buccal surface, its adaptability is 75% of the cases. 2. When the effective axial displacement of the clasp arm is estimated to 60% of the distance from 1/4 mm undercut point to surveyline, the axial dimension of the reciprocal plane which should correspond to this displacement is from 0.59 mm to 2.32 mm on the proximal surface of the abutment, and its mean value is 1.35 mm. 3. When the rotation center locates the mesial rest on the first premolar and "I" bar tip locates the second premolar, the value of the effective axial displacement of the clasp arm estimates 0.75 mm, which should control the lifting up of the free end within 3 mm, and the axial dimension of the reciprocal plane which should correspond to this displacement is 1.1 mm. 4. In order to control the lifting up of the free end within 3 mm, there is only 10% of the cases having the effective axial displacement of the clasp arm lessthan 0.75 mm, however, 90% of the cases may have this displacement when the additional compensative undercut of 0.1 mm is prepared on the tooth surface. From above those results, it is considered that the effective axial dimension of the reciprocal plane on the denture retntion is approximately 1 mm, and the retentive force increases with slight mouth preparation.
日本補綴歯科学会の論文
1982-08-01

Reciprocal plane の設定喜寿に関する研究 : 第1報歯冠の解剖学的条件に基づく垂直径について

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Reciprocal plane の設定喜寿に関する研究 : 第1報 歯冠の解剖学的条件に基づく垂直径について

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Reciprocal plane の設定喜寿に関する研究 : 第1報歯冠の解剖学的条件に基づく垂直径について