抄録
Today the common acceptation of the term congenital tooth is used to mean the tooth which is already erupted in the oral cavity of a new suckling on the occasion of its birth. According to the literature related to congenital teeth, most cases occur in the locality of lower incisors. But even today there is no research report available concerning its electron microscopy. 4 congenital teeth from 2 sucklings were recently sent to the author by the courtesy of Dr. O. Okamoto, a practicing dentist at Yonago City, Main Island, Japan. Therefore, he was enabled to examine electron microscopically the hard tissues of the congenital teeth. As a consequence, some interesting findings have come to light respectively in the enamel, dentin and cementum.
Concerning these congenital teeth, Dr. Okamoto and his associates had already published in detail their macroscopic aspects in a Japanese dental journal “Shikai-tembo” (Dental Outlook), Vol. 23, No. 4, in 1964. Here reference is made to macroscopic photographs and measurement rates of the congenital teeth from their paper.
