Abstract
Sproles, R. A. (1975) reported on cervical pulp horns which extended periously close to the tooth surface on human permanent molars. However, cervical pulp horns on human primary molars remained unknown. The purpose of this investigation was to make clear whether cervical pulp horns also exist on human primary molars. Fourty extracted human primary molars were used for this experiment. The teeth were sectioned with a diamond disk with a point of 5 mm coronal to the cervical line. The specimens were washed with a supersonic washer and dried, and all soft tissue removed. Silicone rubber impression material was injected into the pulp chamber and five replica plaster models of each tooth were made. Colored wax was injected into the pulp chamber of the plaster models and the plaster models were then divided into four medio-distally. Sections were tracted and measured on a profile projector.
From the results of this experiment the following conclusions were drawn.
1) It was confirmed that cervical pulp horns were also exist on human primary molars.
2) Cervical pulp horns on human primary molars considered to be located in the cervical portion, extend buccally to the tooth surface in triangular form.
3) Fifteen cervical pulp horns were observed in 40 human primary molars (37.5%).4) The buccal extension of the cervical pulp horn is 0.32 mm on the average.
