Biomedical subjects
Publications and source records attributed to M D Wise.
In restorative and prosthetic dental treatment, casts which duplicate the patient's dentition are frequently mounted in an articulator which simulates jaw movements. In order to relate the mandibular cast to the maxillary cast, records are made in the mouth utilising suitable materials. Three common recording materials will be discussed.
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Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
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In light of the results of this study, a number of conclusions can be made with reference to full coverage castings. 1. Dental cement causes occlusal displacement. Zinc phosphate cement results in a greater displacement than does temporary zinc oxide-eugenol cement. 2. The disparity in seating of cast restorations obtained with no cement, temporary zinc oxide-eugenol cement, and zinc phosphate cement tends to reduce in magnitude with increasing taper of the tooth preparations. 3. Venting of crowns is an effective way of reducing the disparity in seating between no cement, temporary zinc oxide-eugenol cement, and zinc phosphate cement. 4. Remount records should be made with the restorations cemented with temporary zinc oxide-eugenol cement rather than held to the teeth by friction alone.
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The object of this study was to measure any mandibular flexure occurring in the horizontal plane, when R.A.P. recordings were made with an 'anterior jig' (Lucia, 1964), chin-point guidance and patient-applied muscle force. The rationale for the experimental method was that any arch-width change noted at the tooth level reflected a flexure of the mandible. Ten subjects participated and the mean lateral flexure of the mandible in the horizontal plane was 0.073 +/- 0.028 mm. As a corollary to the study, mean medial flexure of the mandible in wide opening movements was found to be 0.093 +/- 0.044 mm, which was consistent with earlier workers' results. On the basis of the results obtained, restorations constructed to muscle-R.A.P. recordings could conceivably present as occlusal interferences and, indeed, articulators may require modification so as to allow for mandibular resilience.
The study reported compared the positions of the horizontal axis of rotation of the condyles when R.A.P. registrations were taken on seven subjects using; (1) An anterior jig with chinpoint guidance. (2) An anterior jig with chinpoint guidance and applied muscle force by the subject. (3) An anterior jig with bilateral manipulation (i.e. bilateral support of the body of the mandible by the operator). The results showed that the most superior positions were obtained with the technique using the anterior jig with chinpoint guidance and applied muscle force, which was also the most inconsistent technique. The technique using the anterior jig with chinpoint guidance was most consistent, and the mean difference between retruded axis position and intercuspal position using this technique was 0.31 mm on the right side and 0.34 mm on the left side.
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A technique has been presented whereby models which can be animated are used to form a projected image on a screen and thereby demonstrate the principles of occlusion together with principles of articulators. The system can be used alone or in conjunction with clinical slides interjected at relevant places in the discussion. This technique has been found to be a very useful aid in the teaching of occlusion to both graduate and undergraduate students.