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PubMedDate not supplied

Endosseous implants for total support and retention of a complete mandibular removable prosthesis.

This is a clinical report illustrating and discussing the use of endosseous root-form implants, both anterior and posterior to the mental foramen, in support of three separate Hader bars which in turn provide total occlusal support, resistance, and retention for a conventionally fabricated full mandibular overdenture. Principles of design, advantages, and disadvantages are listed.

Alveolar Bone Loss↗
PubMed2001

Evaluation of the effect of the residual bone angulation on implant-supported fixed prosthesis in mandibular posterior edentulism. Part II: 3-D finite element stress analysis.

Buccolingual angulation of the mandibular posterior edentulous region may affect the prosthetic load conditions, so as to cause high stress concentrated areas that may easily lead to failure. The aim of this study was to evaluate the effect of various predetermined buccolingual angulation values on stress distribution in the mandibular posterior edentulous region restored with implant-supported fixed partial dentures, using three-dimensional finite element analysis. Stress analyses were performed applying 400N oblique force to implant-supported fixed prosthesis. Stress analyses indicated tensile stress values on the buccal surface and compressive stress values on the lingual surface of cortical bone were increased as the angulation of the edentulous bone increased (especially corresponding to the cervical region of the implants). Compressive stress values, observed where two implants were placed at the second premolar and second molar regions (5-7 design) and first and second molar regions (6-7 design), respectively, were very close to or even exceeded the ultimate compressive strength of bone. It is concluded that when a definite buccolingual angulation is added to other existing risk factors such as bruxism, placing an implant for every missing tooth might reduce the high stress concentration areas.

Bicuspid↗
PubMedDate not supplied

Rehabilitation of the edentulous mandible with a fixed implant-supported prosthesis.

UNLABELLED: Implant rehabilitation of an edentulous mandible presents significant improvements over conventional complete denture therapy with regard to patient satisfaction, and it can improve a patient's quality of life. Several implant prosthetic designs have been developed and successfully utilized in clinical practices. The goal of this article is to describe the prosthetic design and technical steps in the fabrication of a fixed implant-supported mandibular prosthesis. A technique is described in which the positioning of appropriately selected abutments is completed in a predictable manner. LEARNING OBJECTIVES: This article discusses the prosthetic designs and technical steps in fabricating a fixed implant-supported mandibular prosthesis. Upon reading this article, the reader should: Understand the prosthetic design for the treatment of an edentulous mandible. Recognize the significance of the technical steps in this rehabilitation process.

Aged↗
PubMed1983

Diagnosis of the aesthetic components of the mandibular anterior prosthesis.

This paper explores seven different factors which should be considered when prescribing the lower anterior prosthesis: alignment as seen from the incisal; height of the incisal edges; degree of irregularity of the teeth; character of the incisal edge; height of the cuspid; mesio-incisal angle of the cuspid; and ridge coverage. The weights and variations of these different factors are discussed and suggestions made for a complete work authorization.

Cuspid↗
PubMed1996

[Treatment of obstructive sleep apnea syndrome using a mandibular advancement prosthesis: review of the literature].

The treatment of OSAS with prosthetic devices displacing forward and lowering the mandible in order to increase the size of the pharyngeal airway is seldom used at present. Some recent publications attracted our interest and we deemed it of interest to review them. Our work is mostly concerned with objective results as assessed by polysomnography, and also with cephalometric changes caused by the device. In spite of equivocal results at polysomnography, which seldom met commonly accepted criteria of successful treatment, indiscutable therapeutic successes have been reported. Therefore, this simple, reversible and cheap devices could be advocated in cases of mild or moderate OSAS. However, their role in the therapeutic armamentarium of OSAS as well as their indications and efficacy need to be better assessed.

Cephalometry↗
PubMed1985

Delayed mandibular reconstruction following removal of a mesenchymal chondrosarcoma. Report of a case.

An unusual case of mesenchymal chondrosarcoma is presented. Initially seen when the patient was 8 years old, the lesion was repeatedly biopsied and curetted with a diagnosis of odontogenic fibroma. In 1971 a diagnosis of osteosarcoma of the chondroblastic type was made. At that time, the patient underwent a partial mandibulectomy with immediate graft. The patient did well until 1981, when a recurrence of the lesion was noted. The microscopic diagnosis at this time was mesenchymal chondrosarcoma. The treatment of this lesion as a staged procedure with initial resection of the mandible and placement of a silicone rubber mandibular prosthesis is discussed. The second stage of the procedure was definitive mandibular reconstruction, with an allogeneic mandible as a crib for autologous particulate cancellous bone from the iliac crest. Although the prognosis of mesenchymal chondrosarcoma is usually grave, this case is unusual because of its long history of multiple procedures performed prior to the definitive treatment of the lesion 14 years after its discovery. Two-year follow-up since the definitive mandibular reconstruction shows adequate range of motion, excellent healing, and no recurrence.

Bone Transplantation↗
PubMed2000

Orofacial prosthesis design and fabrication using stereolithography.

The use of stereolithography for the manufacture of implantable prostheses is relatively new. Until now, its use with regard to mandibular resection has been to produce pre-operative models that allow more sophisticated planning of the contour and better preparation of the metallic framework to be implanted. This framework rejoins the sections of the mandible, returning some function, but providing no soft tissue support. Hence, the aesthetic results are not optimal. The aim of this study was to investigate the accuracy with which a stereolithographic model could be made to completely reunite both surfaces of the resected mandible and restore full contour. The design and fabrication of a mandibular prosthesis utilizing CAD/CAM technology and stereolithography is still in the early stages, but initial results indicate that with further research and better tools this could provide a new approach to mandibular resections, providing better aesthetic results.

Computer-Aided Design↗