Hemimaxillectomy prosthesis stabilization with hydroxylapatite coated implants: a case report.
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Biomedical subjects
Publications and source records attributed to I M Finger.
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Current concepts of salvaging large restorations and repairing crowns have been presented. Repair of restorations in the mouth is indicated in specific instances. The procedures described, when properly used, can result in a considerable savings both in time and expense to the dentist and the patient.
Results of the reconstruction of 228 deficient alveolar ridges (208 patients) using hydroxylapatite with or without autogenous cancellous bone over a six-year period are reported. Complications included erosion, mental nerve neuropathy, migration and displacement of particles, overfill, and loose material. Modified techniques are presented that minimize the occurrence of these complications in Class III and IV ridge-deficient patients.
Diagnosis and treatment planning are essential prior to the placement of any dental implant. An overview of prosthodontic considerations in the restoration of such implants is presented in this article. Concepts for both the edentulous and partially edentulous mouth are discussed.
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Semiprecision attachments are used in the construction of removable partial dentures. Where utilized, these attachments afford bracing to the denture. Methods have been described to ensure the longevity and adequacies of such attachments, and techniques have been presented to guarantee such maintenance.
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Two techniques have been described to expedite fabrication and reduce the cost of prostheses made for staple implants. The techniques permit placement of a simulated transosseous pin within the master cast. At the time of denture placement in technique No. 1, the coping-bar attachment assembly is cemented (Fig. 12). In technique No. 2 the superstructure is placed over the transosteal pins and secured between the locknuts to maintain the base of the lower locknut 1.5 mm from the crest of the alveolar ridge (Fig. 13). Technique No. 2 permits removal of the superstructure as desired. Patients should be instructed in proper oral hygiene and denture care.
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A 4-year study and evaluation of nonresorbable hydroxylapatite to augment different alveolar ridges has been reported. The technique used resulted in improved contour, height, and width of the alveolar ridge. It was found that denture comfort improved with ridge augmentation as this allowed improved stability, support, and preservation of the ridge. Patient satisfaction was correlated to both surgical and prosthodontic success with the use of hydroxylapatite. The state and health of the tissues were found to be improved with the use of hydroxylapatite or hydroxylapatite and bone marrow. The prosthetic and surgical procedures were found to be easier to perform, and they produced more permanent and superior results than those previously experienced with only bone grafts and other alloplasts.
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In this study the compensating angle on the Hanau XP-51 articulator was found to be proportional to the magnitude of the intercondylar distance. Further, eccentric movement of the Hanau 130-7, the Hanau XP-51, and the Whipmix articulators, at the cusp level, followed that displayed by the control articulator when guided by straight condylar elements. For restoration to function harmoniously in the patient's mouth they must be made on an instrument that can accurately reproduce selected movements of the mandible. The choice of articulator depends upon the precision with which the dentist wishes to work. The mechanisms of articulators should be precise, easy to adjust, and simple to understand.
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A new semiadjustable articulator, the Hanau XP-51, was investigated by comparing its movements at the cusp level to those of a Stuart articulator when guided by straight condylar elements. No clinical trial was undertaken in this investigation, and no mandibular movements were registered on the Stuart articulator for transfer to the Hanau XP-51 articulator. A method of comparison and mathematical formulae were described whereby specific angles were calculated for both articulators. All tabulated angles were correlated by determining the least-squares slope of the observed angular variation as a function of the three independent variables in a computerized program. The standard deviation from these was calculated for each articulator, and the differences were found to be very small. It was concluded that the experimental Hanau XP-51 articulator could reproduce specific movements made by the Stuart articulator. Further, the adjustable posterior wall within the condylar housing was found to compensate for the lack of an adjustable intercondylar distance on this articulator.
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