ISSN:1056-6163    

出版商:OVID    

年代:1992

数据来源: OVID

摘要:

The need for major surgery involving bone and skin grafting procedures in the treatment of severe alveolar atrophy has, for many patients, been obviated by the advent of reliable endosseous implant systems. However, some patients, usually for medical, psychological, or financial reasons are unsuitable for endosseous implant therapy. In such patients, ridge augmentation with particulate hydroxyapatite may result in significantly improved denture function. However, hydroxyapatite tends to disseminate throughout any surgically created subperiosteal space, resulting in an undesirable ridge form. This problem may be overcome by the use of tissue expanders in a two-stage surgical procedure. This article briefly reviews the concept of tissue expansion and describes its application to the technique of alveolar ridge augmentation. (Implant Dent 1992;1:177-181)

ISSN:1056-6163    

出版商:OVID    

年代:1992

数据来源: OVID

摘要:

The surgical template is utilized in the planning and execution of a successful implant rehabilitation. A method of template fabrication is presented which is useful for cases requiring precise root form fixture placement. Stents are fabricated using a duplicate denture or acrylic base and orthodontic wire, which is contoured to create the acceptable perimetric limits of fixture placement. This approach provides good visual access, operator flexibility, and template stability. The technique can be utilized for the edentulous and the partially edentulous arch. (Implant Dent 1992;1:182-184)

ISSN:1056-6163    

出版商:OVID    

年代:1992

数据来源: OVID

ISSN:1056-6163    

出版商:OVID    

年代:1992

数据来源: OVID

摘要:

Hydroxyapatite-coated titanium alloy test strips were treated with chlorhexidine gluconate, stannous fluoride, citric acid, tetracycline HCl, polymyxin B, hydrogen peroxide, and a plastic Cavitron tip: untreated sterile strips served as controls. The strips were incubated with cultured human gingival and periodontal ligament fibroblasts. Image analysis of three photomicrographs of each test strip (original magnification ×350) indicated that the tetracycline HCl treatment resulted in significantly greater cellular surface area coverage compared with the other treatments. Citric acid and the plastic Cavitron tip also stimulated cell attachment, although the results from the Cavitron tip were not significantly different from citric acid or the other treatment groups. The remainder of the modalities and the untreated cellular controls experienced similar cellular coverage. (Implant Dent 1992;1:189-191)

ISSN:1056-6163    

出版商:OVID    

年代:1992

数据来源: OVID

摘要:

This study evaluated the ability of various chemotherapeutic and mechanical modalities to detoxify endotoxin-contaminated hydroxyapatite-coated dental implant surfaces as determined by the early attachment and growth of human gingival fibroblasts. Hydroxyapatite-coated test strips were contaminated with purified outer membranes of Escherichia coli and treated with citric acid, hydrogen peroxide, stannous fluoride, chlorhexidine gluconate, tetracycline HCl, polymyxin B, a plastic sonic scaler tip, or left untreated (contaminated and sterile controls). Human gingival fibroblasts were then seeded onto the test strips and incubated for 48 hours. The citric acid-treated strips showed greater cell growth than the other treatments. The plastic sonic scaler tip and the polymyxin B-treated samples exhibited greater cell coverage than the sterile control specimens. The use of citric acid and/or a modified plastic sonic scaler tip may be a valuable adjunct when surgical repair of an ailing hydroxyapatite-coated dental implant is contemplated. (Implant Dent 1992;1:195-202)

ISSN:1056-6163    

出版商:OVID    

年代:1992

数据来源: OVID

摘要:

The interface of bone and soft tissue to dental implants has been extensively documented, while the influence of biomechanics and the occlusal interface continues to be overlooked. Yet that same occlusal interface may ultimately be the prime factor in the lifetime survival rate of dental implants. What is lacking, for the practitioner, is a clear concept of the occlusal rehabilitation which is required and appropriate for the totally edentulous implant patient. Lingualized integration represents an occlusal scheme using specific tooth molds designed to improve the likelihood of maximum intercuspation and an absence of deflective occlusal contacts, provide cusp height for selective occlusal reshaping, and achieve a natural and pleasing appearance. Factors in the articulation and arrangement of the posterior teeth to assure the attainment of the fundamental goals of comfort, function, and appearance in occlusal rehabilitation for edentulous implant patients are included. (Implant Dent 1992;1:204-211)

ISSN:1056-6163    

出版商:OVID    

年代:1992

数据来源: OVID

摘要:

Using a two-dimensional axisymmetric finite element analysis technique, different geometrical configurations of implants, abutments, and interfaces have been investigated to alter the stress distribution in the crestal bone region. The crestal bone region is of particular interest due to observations of progressive bone resorption (saucerization). The ability of a prosthetic restoration-implant construct to transfer an appropriate stress at this region will, by definition of Wolff's law (bone's response to strain) and principles of bone remodeling, help to maintain the integrity of the surrounding bone via force transfer. The two geometries investigated involved a traditional flat mating surface and a slanted (oblique) mating surface. In both models a vertical load of 400 N (63 N/rad across 2 pi radians) was applied to the abutment apex. In the crestal bone region the oblique mating surface increased the transfer of horizontal stress 67 percent over the traditional flat mating surface design. The magnitude of stress transferred and the area which it was transferred across was increased in this region. Results indicate potentially more favorable mechanical conditions for bone maintenance surrounding an endosseous dental implant may be achieved if force is transferred preferentially via circumferential grooves and an oblique (dished) implant-abutment mating surface. These theoretical results are consistent with basic principles of stress transfer, stress shielding, and remodeling as well as clinical observations of bone maintenance and resorption. (Implant Dent 1992;1:212-217)

ISSN:1056-6163    

出版商:OVID    

年代:1992

数据来源: OVID

摘要:

Investigators involved in a clinical study on dental implants being conducted by the Dental Implant Clinical Research Group participated in a two-part in vitro evaluation of the Periotest system. The first part involved each of 35 investigators taking three readings for each of 16 models designed to simulate an implant in place in the oral cavity and to cover most of the effective measuring range of the instrument. The second part, with which this article is concerned, was conducted by three study investigators to determine the level of agreement in readings for six different Periotest instruments. Readings were taken according to the manufacturer's instructions until two coincident readings were obtained. The readings were compared to evaluate inter- and intrainstrument reliability. Instrument repeatability was evaluated by examining the number of attempts required to obtain the two coincident readings. The Periotest system generally demonstrated a high degree of repeatability and reliability, with higher variability associated with specific model samples. (Implant Dent 1992;1:221-226)

ISSN:1056-6163    

出版商:OVID    

年代:1992

数据来源: OVID

ISSN:1056-6163    

出版商:OVID    

年代:1992

数据来源: OVID