Dental Dentures

107 (Partial Dentures: Anchorage with Precision Attachments)

Often, the survey line is found to lie so far occlusally in areas planned for the upper arm or shoulder of a clasp that occlusal interferences can be anticipated. Experience shows that such unfavorable situations most frequently occur on the lower premolars lingually and on lower molars mesio-buccally. In both cases, the entrance into the dental rest must also be taken carefully into consideration Fig. 107).

108 (Partial Dentures: Anchorage with Precision Attachments)

Using a knife, plaster is scraped from the diagnostic model until the height of contour is ideally positioned. It is best to mark the corrected area with a colored pencil (Fig. 108).

109 (Partial Dentures: Anchorage with Precision Attachments)

This corrected model is then taken to the patient and, using a diamond bur, one attempts to remove exactly the same amount of enamel from the tooth as was scraped from the model with the knife. After completing this step, a new impression is taken for the master model (Fig. 109 +110).