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At least 19 recordsLinked to original sources
PubMed2004

[Reconstruction of mandibular defect by using Titanium mandibular prosthesis: a preliminary experimental study].

PURPOSE: The aim of this experiment was to investigate the possibility of application of mandibular reconstruction with titanium mandibular prosthesis. METHODS: Two healthy adult goats were used in this study. Spiral CT of the mandibular region was performed. The data collected was related to the computer. Then a 5 cm mandibular body defect and a mandibular angle defect were designed accordingly. Titanium mandibular prostheses were manufactured according to the size of the above defect. Surgical operation was performed and the prosthesis were implanted into the aimed defects and internal fixation was used. Autogenic bone graft was introduced into the holes of the angle prosthesis. Radiographic examination was used to evaluate the healing of prostheses every month after operation. Three months later, the animal was sacrificed and the mandible specimens were sectioned for histological and biomechanical evaluation. RESULTS: One of the body prosthesis was found to be exposed two weeks after operation. Four weeks later, fixation failed and the anterior part of the prosthesis separated from the mandible attached. The other body prosthesis also suffered from exposure,but the connection between the prosthesis and the mandible was still stable. Histological examination revealed that there was presence of osseointegration in the angle prosthesis as well as area that was not exposed in the body prosthesis model. Reattachment of the muscles to the bone graft area was found. CONCLUSIONS: CAD/CAM generated Titanium mandibular prosthesis is applicable in human model. The vitality of this experiment revealed that a tight closure plays an important role in the healing by osseointegration. If there was any exposure, the osseointegration will be failed. Reattachment of the muscle to the prosthesis can be achieved by "muscle-bone-prosthesis"model.

Animals↗
PubMed2003

The anterior cantilever in the implant-supported screw-retained mandibular prosthesis.

STATEMENT OF PROBLEM: When implants are placed interforaminally in mandibular implant-supported screw-retained prostheses, the most anterior implant is usually positioned lingual to the incisors of the prosthesis. This creates an anterior cantilever with the entire prosthesis acting as a class I lever and possibly placing the anterior implant under alternating tension and compression during function. PURPOSE: The purpose of this study was to measure the anterior cantilever of randomly chosen patients with restored mandibular implant-supported fixed prostheses, and to establish the proportions of anterior to posterior cantilever lengths relative to the anteroposterior spread. MATERIAL AND METHODS: Thirteen edentulous patients were recruited from the University of Minnesota's dental implant program. Each patient had been restored with a maxillary complete denture and a mandibular implant-supported screw-retained prosthesis supported by 5 endosseous implants. Each patient had 1 mandibular impression made with irreversible hydrocolloid, which was poured in type III gypsum. A FaroArm precision 3D measuring stylus was used to make multiple-axis (X-Y-Z) measurements (mm) on the casts of the dental implants, of anteroposterior spread, and anterior and posterior cantilevers. Presence or absence of screw loosening was noted using a screwdriver with finger pressure. Data were analyzed using a 1-way analysis of variance to compare prostheses with loose screws to prostheses without loose screws, for each of 3 outcome measures: length of anterior cantilever, length of posterior cantilever, and anteroposterior spread (P<.05). RESULTS: Mandibular anterior cantilever lengths ranged from 5.5 to 14.4 mm with a mean of 8.78 mm. Combined posterior cantilever lengths ranged from 9.2 to 20.9 mm with a mean of 16.2 mm. Anteroposterior spread ranged from 5.2 to 12.3 mm with a mean of 7.9 mm. From a total of 65 retaining screws, 7 were found to be completely loose. No apparent correlation was found between length of mandibular anterior cantilever and screw loosening (P=.45), although the ratio of posterior cantilever to anteroposterior spread (2:4) was significantly associated with screw loosening (P=.006). CONCLUSION: Within the limitations of this study, anterior cantilevers in mandibular implant-supported screw-retained prostheses were frequent and appeared to depend on implant placement and prosthesis design. The ratio of anterior to posterior cantilever lengths was approximately 1:2.

Aged↗
PubMedDate not supplied

[A procedure for improving the stability of the total mandibular prosthesis with the aid of the muscular factor in the marked atrophies of the mandibular crest].

The study aimed to define factors involved in improving the stability of total mandibular prostheses by the use in optimal conditions of the muscular factor. This is achieved with a special method for casting of the neutral space which allows to prepare the external surface and to place the artificial dental arc according to objective functional criteria. In the first part of the study notions are discussed related to the practical solution of the problem, such as: the anatomo-functional study of formations which define the neutral space, aspects of the neutral space in the total edentate, and the conformation of total prostheses, as well as the placing of the artificial dental arcs in relation to the neutral space. In the second part a method is presented, for making prints, that was used in 35 cases. The results of the prosthetic procedures, verified clinically and electromyographically are promising.

Bone Resorption↗
PubMed1989

[Use of an osteometer in the planning of a mandibular prosthesis].

For series determining of small dimensions at high accuracy a pistollike measuring instrument has been devised which is well suitable for planning mandible prostheses, for instance for obtaining the with dimensions of the mandibula corpus basalis or for example for determining the mesio distal diameter of the teeth.

Anthropometry↗
PubMed2004

Maximizing mandibular prosthesis stability utilizing linear occlusion, occlusal plane selection, and centric recording.

The stability of mandibular complete dentures may be improved by reducing the transverse forces on the denture base through linear (noninterceptive) occlusion, selecting an occlusal plane that reduces horizontal vectors of force at occlusal contact, and utilizing a central bearing intraoral gothic arch tracing to record jaw relations. This article is intended to acquaint the reader with one technique for providing stable complete denture prostheses using the aforementioned materials, devices, and procedures.

Centric Relation↗