Dental Dentures: Partial | Cosmetic Dentistry
Dental Dentures
Teeth whitening
9.1 Position of the Survey Line
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 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). |
 110 (Partial Dentures: Anchorage with Precision Attachments) |
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9. Preparation of the Remaining Dentition
Unfortunately, the preparation of the remaining dentition is often neglected. This is especially regrettable, since in many cases the optimum cast partial denture can only be achieved when the teeth to be clasped are properly prepared, This preparation involves:
- improving the position of the survey line
- removing interferences to the path of insertion
- the preparation of recesses for dental rests
In all cases, diagnostic models (also known as study or planning models) are required. These models are surveyed, but not in a casual manner, as if only for provisional information. On the contrary, a definitive survey line and the final path of insertion must be determined at this stage in the treatment plan.
This is certainly possible, since the path of insertion is determined by the undercuts present. When the model is fixed in the position representing the path of insertion, the survey line is drawn. Only after the preceding steps have been taken can one recognize which, if any, corrections must be made on the remaining dentition.
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