Abstract
In their studies Lecomte (1987) and Watanabe (1992) showed that the rates of clearance at the upper posterior buccal side in the mouth varied depending on the subject. The aim of this study was to investigate how the situation of the opening of the parotid duct changes during growth.
The situation of the opening of the parotid duct was evaluated with plaster model taken from the subjects (Total 24) with primary dentition (8), mixed dentition (8) and permanent dentition (8).
The opening of the duct for the permanent dentition was situated near the standard point (distal side of the first permanent molars), while on the other hand that for the mixed dentition was situated at the mesial side of the standard position. For the primary dentition, the location was at the mesial side of the standard point (distal side of the second deciduous molar).
The conclusion was that the opening of the parotid duct showed a tendency to move at the rear ward in the mouth during growth.
