In the observation of frequency, location, and extention of cervical enamel projection on the maxillary molar teeth of Indian skulls, and in the measure of the distance between cervical line and alveolar crest of the maxillary molars, the following results were obtained. 1. Frequency and degree The cervical enamel projection on the buccal surface of first molars were most frequently 0 degree in 47.1%, followed by I degree in 44.2%, III degree in 3.4% and II degree in 2.5% The cervical enamel projection of second molars were most frequently 0 degree in 40%, followed by I degree in 29%, III degree 23% and II degree 8%. They were most frequently found in the maxillary molar teeth. The cervical enamel projection of third molars were most frequently 0 degree in 58%, followed by I degree in 28%, III degree in 10% and II degree in 3%. 2. Resorption of alveolar crest The average distance between the buccal cervical line and the alveolar crest of the maxillary frist molars were 0 degree in 2.87mm, I degree in 3.63mm, II degree in 5.83mm and III degree in 4.27mm. The average distance of the buccal side on the maxillary second molars were 0 degree in 2.36mm, I degree in 2.90mm, II degree in 3.34mm and III dgree in 3.05mm. The average distance of the buccal side on the maxillary third molars were 0 degree 2.00mm, I degree 2.52mm, II degree 2.50mm and III degree 2.83mm.
上顎大臼歯の歯の頸部ほうろう(エナメル)突起
