Edentulous position of the temporomandibular joint

Two bilateral Schuller's position radiographs were made of 10 edentulous patients with complete dentures. In one radiograph, the complete dentures were in place in centric occlusion. For the other radiograph, the complete dentures were removed and the maxillary and mandibular residual ridges approximated as closely as possible. This position is referred to as the edentulous position of the temporomandibular joint (TMJ). Findings indicate that in the edentulous position the average size of the upper and posterior TMJ spaces and the distance from the center of the condyle to the center of the glenoid fossa on the Y axis of the TMJ are smaller than measurements in the intercuspal position. The size of the anterior space and the distance between the two centers on the X axis are larger in the endentulous position. Because vertical dimension is reduced in the endentulous position, the mentum is in a superior and protrusive position. The study indicates that when the maxillary and mandibular residual ridges are approximate there is a pathologic position of the TMJ and the mandible caused by the loss of all teeth. The study shows that the condyle has the potential to move backward and upward excessively. As a result of the study, the concept of the edentulous position of TMJ is introduced. This concept is important in determining the proper position of the condyle in the glenoid fossa and the correct vertical and horizontal jaw relationship of an edentulous patient when complete dentures are made.

The effect of concordance in the treatment of clients with dental anxiety

This study followed from an earlier case study in which an agoraphobic client was treated daily for a period of four weeks by in vivo exposure. Ratings of his perceived anxiety responses in the behavioural, cognitive, and physiological systems were monitored throughout treatment. Concordance between these ratings was associated with positive outcome. This study was an attempt to replicate some of these findings. A group programme involving four sessions in which clients were taught anxiety management skills, exposed in imagination to situations relating, to dentistry, and given homework assignments was carried out with clients presenting with disproportionate dental anxiety. The subjects were obtained by means of local newspaper and radio advertisements and randomly assigned to a massed or spaced treatment condition. It was predicted that the massed condition involving shorter intersession intervals would be superior at producing habituation and concordance than the spaced condition. The results failed to show differences between the massed and spaced treatment condition with regard to concordance and outcome. However, it was confirmed, once more, that concordance between the three modes of anxiety responding was positively related to outcome.

[A preliminary study on pollinating bees for Amomum compactum Soland ex Maton]

This article deals with the species of bees pollinating Amomum compactum, along with the laws governing their growth and decline, and the pollinating effect of Nomia and Ceratina in the field.