PubMed · 11307420
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P Pistolas. 2000. Visiting another planet.. https://pubmed.ncbi.nlm.nih.gov/11307420/
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Dentists use arbitrary methods in determining the vertical dimension of occlusion, and arranging the maxillary anterior teeth. Some dentists have difficulty in making maxillomandibular records for completely edentulous patients. Therefore the use of pre-extraction records has been recommended. This article reviews the pre-extraction records proposed for determining the vertical dimension of occlusion, recording centric relation, and arranging the maxillary anterior teeth. A MEDLINE search, from 1966-2002, for the key words "pre-extraction records" was supplemented with a hand search to identify relevant peer-reviewed English articles published in dental journals. On the basis of the review, it appeared that pre-extraction records proposed for determining the original vertical dimension of occlusion and arranging the maxillary anterior teeth for a completely edentulous patient were useful and preferred to arbitrary methods, whereas pre-extraction records proposed for recording centric relation may not be necessary.
This article presents a simple and efficient technique to fabricate an anterior deprogramming device using a thermoplastic material. The material, softened by heating, is adapted to the maxillary incisors while moldable. The operator guides the mandible into closure as the material stiffens. The device is then trimmed, and a posterior centric relation record is made using the recording material of choice.
STATEMENT OF PROBLEM: Protrusive condylar angles can be determined by use of wax protrusive records (WPR), pantographic tracings (PT), and occlusal wear facets. These methods generate different angles in the same patient. PURPOSE: The purpose of this study was to compare the condylar inclination angles found by use of the WPR in a Hanau articulator with those found by use of the Whip-Mix PT quick-set recorder. The occlusal wear facet method was not part of this study. MATERIAL AND METHODS: Ten subjects were chosen at random from a dental school patient population. All subjects had a majority of maxillary and mandibular teeth present and according to the examination criteria used in the school's Division of Occlusion, they were healthy with no signs/symptoms of temporomandibular disorders. The WPR was accepted when it was evident that the patient had protruded straight forward at least 6 mm anterior to centric relation, as shown on the Hanau articulator by the condylar spheres having moved anteriorly an equal distance of 6 mm on both sides. The condylar inclination on the articulator was adjusted accordingly. The PT was used according to the manufacturer's directions, which included the use of an intraoral clutch adapted to the mandibular arch, connected to an extraoral facebow with bilateral inscribing pointers. A holder frame was adapted to the face with bilateral flags where the inscribing pointers traced the protrusive movement of the jaw. All the readings were in degrees. No control was used in this project. To test whether there was a significant difference between the 2 independent samples, a Mann-Whitney U test was performed (P=.01). RESULTS: The mean results for the WPR were as follow: right side (28.1 degrees, SD 8.94); left side (31.50 degrees, SD 9.73). For the PT, results were: right side (41.10 degrees, SD 7.53); left side (35.5 degrees, SD 6.43). When right and left side protrusive condylar angles were combined, the values were: WPR (29.80 degrees, SD 9.25); PT (38.30 degrees, SD 6.98). The differences on the right condylar values were significant (P=.01). There was no statistical difference on the left side. CONCLUSIONS: Within the limitations of this study, it was concluded that the PT technique yielded greater values for the protrusive condylar inclination than the WPR.