PubMed · 395967
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J D Walter. 1979-11-06. Partial denture technique. 1.--Introduction.. https://doi.org/10.1038/sj.bdj.4804337
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This study was designed to investigate the measurement of the occlusal contact area (surface) using commercially available equipment and computer programs for image processing and analysis. A stable occlusal record was made using an addition curing silicone rubber putty and was placed on a light source onto which a video camera was focused. This image was digitized and standard thickness records were used to calibrate the appropriate threshold for measurement of contact and near contact surfaces. Differences between individuals and within individuals with and without their partial dentures are large. This method has the potential to be a powerful tool in the study of occlusion.
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The movements and positions of the mandible are controlled by three guiding factors: tooth guidance, joint guidance, and muscle guidance. For this reason, the author proposes new, clearly delineated definitions for the terms "central occlusion", "central relation" and "muscle guidance". The unity of structure and function results from the harmony (biological equilibrium) between these three guiding factors. Deviations of the individual guiding factors (occlusal disorders, decentralized relations, malpositions and misguidances of the muscles) may be analyzed separately to begin with; thereupon, their interrelations will be elucidated. As not all of these three guiding factors are necessarily involved in an impairment (above all, the mandibular joints often show no abnormalities), and since pain is the principle sign in the clinical picture of a dysfunction of the orofacial organ, the author is of the opinion that the term "pain-dysfunction syndrome" (as coined by L. Schwarz) is more correct than such terms as "Costen's syndrome" or "myoarthropathy".