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为探讨楔形缺损的病因，设计进行了两项检测试验：１，检测口腔几个部位的ｐＨ值，结果是腮腺导管口处最低，口腔前庭较固有口腔低，不同部位间差异性明显。２．检测口腔前庭几个部位的肌压力，结果前磨牙区较高，与切牙区及第二、三磨牙区的差异有显著性。我们认为，楔缺的发生是多方面因素综合所致，口腔不同部位之ｐＨ值及前庭区不同部位的肌压力均系与发病有关的因素。
In order to explore the etiology of wedge-shaped defect, two tests were designed: 1. The pH value of several parts of oral cavity was detected. The result was that the parotid duct mouth was the lowest, the oral vestibular cavity was lower than the normal oral cavity, and the difference between the different parts was obvious. 2. Muscle pressure was measured in several parts of the oral vestibule. The results showed that the premolar area was higher than that of the first molar area and the second and third molar areas. We believe that the occurrence of wedge is caused by a combination of factors, the different parts of the oral pH value and different parts of the vestibular area of the muscle pressure are associated with the incidence of factors.