Posterior Teeth Selection in Complete Denture
Question. Explain the selection of posterior teeth in complete denture fabrication.
Answer:
The selection of posterior teeth involves shade, size, number, and form.
Complete denture fabrication Shade of Posterior Teeth
The shade of the posterior teeth should harmonize with the shade of the anterior teeth. The maxillary bicuspids used more for esthetic than for functional purposes and the shade will be the same as a canine tooth.
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Complete denture fabrication Size and Number of Posterior Teeth
This depends on the anatomy of the surrounding oral environment and the physiologic acceptance by the supporting tissues. The posterior teeth must support the cheeks and tongue and function in harmony with the musculature in swallowing and speaking as well as in mastication.
Complete denture fabrication Form of Posterior Teeth
- The occlusal form will be decided by the type of occlusion to be developed. If the teeth are to be balanced in the centric and eccentric positions, a cusp form tooth is indicated.
- If the posterior teeth are to dis occlude when an eccentric jaw movement occurs, either cusp or monoplane teeth can be used. If the posterior teeth are to be arranged on a plane and balanced in a centric position only, monoplane teeth are used.
Complete denture fabrication Buccolingual Width of Posterior Teeth
The buccolingual widths of artificial teeth should be less than the widths of the natural teeth they replace. Artificial posterior teeth that are narrow in a buccolingual direction are better to develop the correct form of the polished surfaces of the denture allowing the buccal and lingual denture flanges to slope away from the occlusal surfaces.
Complete denture fabrication Mesiodistal Length of Posterior Teeth
- The length of the mandibular residual ridge from the distal of the canine to the beginning of the retromolar pad is usually available for artificial posterior teeth.
- After the six anterior mandibular teeth have been placed in their final position, a point is marked on the crest of the mandibular ridge at the anterior border of the retromolar pad.
- A ruler can be used to measure from the distal surface of the mandibular canine to the point that has been marked at the end of the available space.
- The total mesiodistal width in millimeters of the four posterior teeth is often used as a mold number. For example, mold 32L of the Dentists’ Supply Company signifies that the four posterior teeth have a total mesiodistal dimension of 32 mm and a long occlusocervical length.
Complete denture fabrication The vertical length of the Bucco Posterior Teeth
It is best to select posterior teeth corresponding to the interarch space and to the length of the anterior teeth. The length of the maxillary first premolars should be comparable to that of the maxillary canines or, the denture base material will appear unnatural distal to the canines. The ridge laps that are thin and long can be easily positioned in full ridges posteriorly.
Complete denture fabrication Commonly used Materials
- Vacuum-fired porcelain teeth are more resistant to abrasion and therefore, maintain their luster longer than acrylic resin teeth. Acrylic resin teeth can be altered and will bond with the denture base for retention in instances of limited interarch space.
- Acrylic resin teeth are preferred when the teeth in the opposing arch have been restored with gold; as the porcelain has a higher coefficient of wear than gold.
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