Application of magnetic force in retention of prostheses has been tried more than half century, but it was not clinically satisfactory. With the development of magnetic materials and manufacturing technique, magnetic attachment has been applied in various types of oral and maxillofacial prostheses successfully in recent 20 years.
Prostheses and Implants ; Magnetics

In this study, 50 patients with the lesions of anterior teeth were treated by pivot technique. The lesions included the lack of much heard tissue, malposition teeth, lack of some anterior teeth with malposition or with lack of heard tissue of adjacent teeth. The result revealed that 1) pivot technique was effecting for such lesions of anterior teeth and 2) the major cause of these lesions was trauma.
Tooth ; Pathologic Processes

In this study, 50 patients with the lesion of anterior teeth are treated by pivot technique. The lesions include: lack of much hard tissue, malposition teeth, lack of some anterior teeth having malposition or lost-hard-tissue adjacent teeth. The study reveals that: (1) pivot technique is efficient to such lesions of anterior teeth. (2) the major cause of these lesions is trauma.
Efficiency ; Tooth

60 Kennedy I+II edentulous patients were treated by the removable partial dentures and divided into two groups. In the first group, the semi-adjustable articulator Quick Master was used for 30 patients in the arrangement of the artificial teeth. In the second group, the simple (hinge) Oswung articulator was used. Results showed that the semi-adjustable articulator has better effect in comparison with the hinge articulator. The length of the correcting occlusal discrepancies was shorter when the semi-adjustable was used.
Mouth, Edentulous, Dentures

PURPOSE: Accuracy of image matching between resting and smiling facial models is affected by the stability of the reference surfaces. This study aimed to investigate the morphometric variations in subdivided facial units during resting, posed and spontaneous smiling. MATERIALS AND METHODS: The posed and spontaneous smiling faces of 33 adults were digitized and registered to the resting faces. The morphological changes of subdivided facial units at the forehead (upper and lower central, upper and lower lateral, and temple), nasal (dorsum, tip, lateral wall, and alar lobules), and chin (central and lateral) regions were assessed by measuring the 3D mesh deviations between the smiling and resting facial models. The one-way analysis of variance, Duncan post hoc tests, and Student’s t-test were used to determine the differences among the groups (α = .05). RESULTS: The smallest morphometric changes were observed at the upper and central forehead and nasal dorsum; meanwhile, the largest deviation was found at the nasal alar lobules in both the posed and spontaneous smiles (P < .001). The spontaneous smile generally resulted in larger facial unit changes than the posed smile, and significant difference was observed at the alar lobules, central chin, and lateral chin units (P < .001). CONCLUSION The upper and central forehead and nasal dorsum are reliable areas for image matching between resting and smiling 3D facial images. The central chin area can be considered an additional reference area for posed smiles; however, special cautions should be taken when selecting this area as references for spontaneous smiles.