[Vertical displacement of Konus retainers in removable partial denture. Longitudinal measurements using a fixed microgap sensor in the oral cavity].
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PATIENT: The patient (57-years-old female) suffered from severe chronic periodontitis in the maxillary and mandibular molar regions. After extraction of these teeth, treatment dentures were immediately placed in the maxilla and mandible to restore the occlusal-supporting area. Final denture treatment was done by adjusting the provisional dentures according to the patient's concern. Good prognosis was obtained during 9 years. DISCUSSION: To restore bilateral occlusal-supporting areas, treatment dentures reduced the loss of remaining teeth. CONCLUSION: Treatment dentures can stabilize the occlusal relationship immediately after loss of occlusal-supporting area, and may also contribute the patient's acceptance of and satisfaction with the final prostheses.
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In order to investigate the influence of various impression procedures on the morphology of the partially edentulous mucosal tissue precisely, a new 3-D measurement system based on a binocular-temporal gradient method was devised. The greatest advantage of the system is that the amounts of substance and minute deformation of the object can be easily measured simultaneously. The accuracy of the system is 0.1mm and 10mm in the substance measurement and in the deformation measurement respectively. Three parameters selected for the impression procedure were the space between the inner surface of the tray and the mucosal tissue, the flow of impression material and the size of tray. It was found that the amount of displacement in the mucosal tissue was increased as the thickness of space on the tray was reduced or the viscosity of the impression material was increased in partially edentulous patients. Moreover, the large tray caused greater displacement around the margin than the small one.
Implant supported prostheses are highly successful restorations. There are multitudes of differing designs for these restorations. It is advantageous to retain some nervous input from the remaining dentition. The treatment modality presented in this paper not only has the support, stability, and retention necessary for all restorations, some of the remaining teeth are retained and are included in the restoration design.
As a result of people keeping their teeth longer, modern dentists are encountering more partially dentate patients and difficult restorative problems. It is possible to solve some of the problems caused by the unusual angulations and undercutting when the remaining teeth of partially dentate patients start to drift by using the hinge clasp. The authors describe the types of device available and outline the advantages (and disadvantages) of its use.
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