Dental Dentures: Partial | Cosmetic Dentistry
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9.5 Provisional Bite Registration part 3
 125 (Partial Dentures: Provisional Bite Registration) - Corrections on the diagnostic models as seen from inside the mouth (Fig. 125) - Corrections on the natural teeth - Definitive or final impressions - Master models |
 126 (Partial Dentures: Provisional Bite Registration) - Definitive survey (Fig. 126) |
 127 (Partial Dentures: Provisional Bite Registration) - Completed cast metal frameworks (Fig. 127) |
 128 (Partial Dentures: Provisional Bite Registration) - Models with metal frameworks reseated on the split-cast base. The occlusion can be checked (Fig. 128) |
 129 (Partial Dentures: Provisional Bite Registration) - Finished partial dentures (Fig. 129) |
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9.5 Provisional Bite Registration part 2
 121 (Partial Dentures: Provisional Bite Registration) - Articulated models (Fig. 121) |
 122 (Partial Dentures: Provisional Bite Registration) - Articulated using the split-cast technique (Fig. 122) |
 123 (Partial Dentures: Provisional Bite Registration) - Preliminary survey (Fig. 123) |
 124 (Partial Dentures: Provisional Bite Registration) - Corrections on the diagnostic or study model (Fig. 124) |
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- HOW TO TAKE BITE REGISTRATION
9.5 Provisional Bite Registration part 1
 119a (Partial Dentures: Anchorage with Precision Attachments) In all cases where the teeth to be clasped have antagonists and the teeth present do not enable an unmistakable articulation of the models, it is reasonable to record a bite registration prior to initial surveying. This is particularly applicable in cases where only the anterior teeth remain in both arches. There is hardly a more difficult case for fabricating a cast partial denture than one in which only anterior teeth remain in the upper arch, from 13 to 23, all opposed by natural antagonists. |
 119b (Partial Dentures: Anchorage with Precision Attachments) The following procedure is recommended: - Initial impressions - Diagnostic models (Fig. 119 a + b) |
 120a (Partial Dentures: Anchorage with Precision Attachments)  120b (Partial Dentures: Anchorage with Precision Attachments) Occlusal bite plates record bases + occlusal rims) Fig. 120a + b) Bite registration |
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9.3 Preparation of Recesses for Dental Rests
 114 (Partial Dentures: Anchorage with Precision Attachments) On posterior teeth the preparation of recesses for dental rests is relatively simple. However, difficulties can be encountered when a clasp must be placed where no edentulous space is present. The following mistake is often seen: recesses are prepared for the occlusal rests interproximally (Fig. 114), but a path is not provided into and out of the rests for the clasp shoulder (Fig. 115). |
 115 (Partial Dentures: Anchorage with Precision Attachments)  116 (Partial Dentures: Anchorage with Precision Attachments) Ample space must be provided through the occlusal embrasures to avoid occlusal interference and prevent possible breakage of the clasp. Definite recesses must be provided for the occlusal rests to insure that no wedging of the abutment teeth occurs. A great deal of precision is required in the preparation of a Bonwill or embrasure clasp (Fig. 116). |
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Tags: Dental Rests, Recesses
9.2 Interferences to the Path of Insertion
 111 (Partial Dentures: Anchorage with Precision Attachments) Many misunderstandings between dentist and laboratory technician occur because the dentist cannot seat a cast partial denture in the mouth, although the model was correctly surveyed. The cause is as follows: In order for the retentive arm of a clasp to properly spring over the height of contour, an inclined surface must be present above the survey line just as an inclined surface must be present below it, leading into the retentive undercut. The problem here is that frequently an inclined surface above the height of contour is missing. Although natural, unchanged teeth often possess such inclined surfaces, these eventually disappear through tipping and/or abrasion. Upon insertion, the result is that the clasp rests on a flat surface. If one is unaware of this situation and applies too much pressure in an attempt to further seat the partial denture, the clasp will be bent (Fig. 111). |
 112 (Partial Dentures: Anchorage with Precision Attachments) Typical in this situation is that the height of contour is located quite far occlusally and above it no inclined surface to gradually open the clasp is present. In such cases, scraping the diagnostic model is again required to ascertain the amount and location of preparation necessary on the tooth itself (Fig. 112). |
 113 (Partial Dentures: Anchorage with Precision Attachments) Again, failure was caused by a lack of adequate preparation of the teeth to be clasped. Here, too, if more care had been taken during preliminary surveying of the diagnostic model, the problems would have been recognized initially (Fig. 113). |
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