Biomedical subjects
Publications and source records attributed to J N Kent.
This paper describes the surgical and restorative use of the Integral endosseous implant for overdenture stabilization with different types of retentive attachments. The clinical experiences of 90 overdenture patients with follow-up to 56 months postrestoration are discussed. With proper patient work-up, failure and morbidity has remained low.
This article outlines the treatment planning, surgical technique, and experiences with patients requiring maxillary sinus floor elevation for simultaneous autogenous bone grafting and placement of hydroxylapatite-coated dental implants. The results of six cases followed for up to 4 years are described.
A case is reported in which a modified rhytidectomy incision is used to access both the TMJ and the lateral ramus for total TMJ reconstruction. This approach hides the incision in the neck hairline and eliminates the retromandibular incision scar.
A case of 21-year-old woman with subacute sclerosing panencephalitis presenting with paranoid schizophreniform symptoms is presented. The relationship between viral encephalitis and psychiatric symptoms is briefly considered.
This study evaluated the response of canine mandibular bone to loaded hydroxylapatite-coated (HAC) and grit-blasted titanium (GT) endosseous dental implants. Four dogs were partially edentulated in the maxilla and mandible. Two implants supporting freestanding prostheses were placed in each quadrant. Following 1 and 10 months of loading, the implants were evaluated. Soft-tissue pocket depths were not statistically different between the HAC and GT implants. Crestal bone loss was not significantly different between the two implants. However, the HAC implants had a statistically significant greater amount of bone apposed to their axial and apical surfaces compared to the GT implants.
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The response of bone to surface-textured dense hydroxylapatite (HA) was evaluated in interpositional and onlay grafts to the dog mandible. For surfaced-waffled HA blocks, bonding of bone to the HA stabilized the interpositional grafts within 4 weeks and the onlay grafts at 6 weeks. Bone conformed intimately to the textured HA surface. This study demonstrates the early bone response to surface-textured HA blocks in the dog.
This study investigates the tissue response in dogs to mandibular augmentation with hydroxylapatite (HA) combined with demineralized bone. Thirty mongrel dogs underwent ridge augmentation with 3 ml of HA alone (HAO), HA combined with autogenous bone (HAB), or HA combined with demineralized bone (HAD). Bone was not found in the HAO augmented ridges through 52 weeks; bone was found in the HAB augmented ridges by 12 weeks, and the HAD augmented ridges had bone formation after 26 weeks. This study demonstrates that demineralized bone can induce osteogenesis within the HA augmented dog ridge, but it is delayed when compared to HAB augmentations.
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Seven patients who had noticeable defects of their frontal bone were reconstructed with dense hydroxylapatite (HA) particles with or without autogenous bone placed directly over the dura. The results indicate that HA is well tolerated over dura; no meningitis occurred with follow-up of one to 3 1/2 years. The clinical response was excellent and complications were minor, generally related to particle control and settling.
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Rheumatoid arthritis and related arthropathies may produce a wide, confusing range of problems affecting the temporomandibular joint and ultimately the lower face. In order to understand the evolution of therapy for TMJ and facial problems, a general update of overall disease characteristics, current medical therapy, and peripheral joint surgery is presented. This background is integrated into a rationale for treatment of rheumatoid problems affecting the mandible.
A new classification of four types of TMJ involvement is proposed to help orient and direct the medical and surgical treatment of patients with rheumatoid disease and related arthropathies. Clinical symptoms, radiographic findings, facial deformity features, treatment planning, and results are discussed, with case reports that illustrate each type. Interpositional polymer laminates, a new glenoid fossa prosthesis, and a metallic condyle are introduced for use in selected cases where erosion and destruction of the condyle, meniscus, and fossa area have produced significant TMJ dysfunction and occlusal-facial deformity.
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.
The Titanium Plasma-Sprayed Swiss Screw Implant System is described, with a discussion of preoperative patient evaluation, and implantation and prosthetic techniques. The results in 484 patients in whom these implants were placed in four countries are summarized.
A new technique for treating diffuse sclerosing osteomyelitis is described. The entire lesion is eliminated and the ridge bulk and form are immediately reconstructed by implantation of hydroxylapatite. Three cases are described.
A comparison of solid root forms and particulate hydroxylapatite implanted into dog tooth extraction sites showed both types of implants to be well tolerated. Neither prevented postextraction bone resorption, but the particles were better able physically to maintain ridge height and width than the root forms.