[Rapid compression of maxillary molar region, and its effects on sutures of the cranio-facial bones].

Twenty young hybrid dogs were classified into 5 groups: the control, the group examined immediately after 2 weeks compression (3.52 mm), and those examined at 2, 4 and 8 weeks retention. In those animals undergoing compression 4 times, Dentaurum expansion screws (#602-813) were placed between the left and right fourth dento premolar. when rapid compression was used interruptedly, local synostosis was only seen in the palatine suture, but following retention for 8 weeks, this phenomenon almost completely disappeared. The internal mechanical force of the adjoining sutures had disappeared within 4 weeks of retention. In conclusion, this clinical application causes no permanent damage.