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Results for “Denture Precision Attachment”

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At least 559 records · Page 31Linked to original sources
PubMed1989

The transmandibular implant: a 12-year follow-up study.

A clinical study of the use of the transmandibular implant for reconstructing severely atrophic mandibles in preparation for an implant-borne dental prosthesis was performed. This study included 368 patients with a mean height of the mandible of 10 mm. They were examined clinically, radiographically, and by means of a questionnaire. The follow-up period for 185 patients was 5 years or more, and 55 were followed 10 years or more. Removable dentures were made for 350 patients, and fixed bridges for 18 patients. Forty-three patients had reversible complications, one patient had unilateral hypesthesia, and six patients had their implant removed. Reversible complications of infection, gingival hyperplasia, loading of individual posts, and fenestration of threads were controlled without deleterious effects on the gingival, mucosal, or osseous tissues. The transmandibular implant system was shown to successfully restore function of the severely atrophic mandible in a more predictable manner than augmentation procedures.

Adult↗
PubMed2005

Stress distribution in fiber-reinforced composite inlay fixed partial dentures.

STATEMENT OF PROBLEM: Fiber-reinforced composite inlay fixed partial dentures (FRCIFPDs) may be a reliable prosthetic solution. Clinical procedures involved in their fabrication have been defined, but little is known about their mechanical behavior. PURPOSE: This in vitro study used the finite element (FE) method to investigate 3-dimensional (3-D) stress and strain distribution produced in a 3-unit FRCIFPD. MATERIAL AND METHODS: A 3-D FE model (227,768 3-D tetrahedral elements) of a 3-unit FRCIFPD cemented onto box-shaped prepared teeth was developed. Stress and strain distribution generated by a maximum load of 196 N applied vertically or laterally to the FRCIFPD centrally, on an area of 4 +/- 0.1 mm 2 , was analyzed. The specimen used to acquire the geometry of the model was also used for mechanical compressive tests, with vertical and lateral loads, to validate the numerical model. RESULTS: The peak values of stress, calculated on the outer and inner surfaces of the FRCIFPD, were localized in the connector areas. When a vertical load was applied, stress on the prepared teeth was concentrated at the cervical margin of the abutment preparation. CONCLUSION: Within the limitations of this in vitro study, the results suggest that within the FRCIFPD, stress concentrates at the connector areas, and that in the prepared teeth, peak stress is at the cervical margin of the box of the preparation.

Acrylic Resins↗
PubMed2005

Retrospective evaluation of complete-arch fixed partial dentures connecting teeth and implant abutments in patients with normal and reduced periodontal support.

STATEMENT OF PROBLEM: The clinical outcome of complete-arch fixed prostheses supported by implants and natural tooth abutments in patients with normal or reduced periodontal support has been reported by few studies, with controversial results. PURPOSE: The purpose of this study was to report on the implant success rate, prosthetic complications, and the occurrence of tooth intrusion, when complete-arch fixed prostheses, supported by a combination of implants and teeth, were fabricated for patients with normal and reduced periodontal support. MATERIAL AND METHODS: Nineteen patients with residual teeth that served as abutments were consecutively treated with combined tooth- and implant-supported complete-arch fixed prostheses and were retrospectively evaluated after a period varying from 24 to 94 months. Nine patients showed reduced periodontal support as a result of periodontal disease and treatment (RPS group), and 10 patients had normal periodontal support of the abutment teeth (more than 2/3 of periodontal support [NPS group]). Ninety implants and 72 tooth abutments were used to support 19 fixed partial dentures. Screw- and cement-retained metal-ceramic and metal-resin prostheses were fabricated with rigid and nonrigid connectors. Implant survival and success rates, occurrence of caries and tooth intrusion, and prosthetic complications were recorded. The number of teeth, implants, prosthetic units, fixed partial dentures, and nonrigid connectors were compared with a t test to assess differences between the 2 groups, while data for the occurrence of intrusions and prosthetic complications were compared with the Fisher exact test (alpha=.05). RESULTS: One of the 90 implants was lost (99% survival rate) over 24 to 94 months, while 3 implants showed more than 2 mm of crestal bone loss (96% success rate) over the same period. No caries were detected, but 5.6% (4/72) of the abutment teeth exhibited intrusion. Intrusion of abutment teeth was noted in 3 patients who had normal periodontal support (13% of teeth in NPS group) of the abutment teeth and was associated with nonrigid connectors. No intrusion of teeth was noted in the patients exhibiting reduced periodontal support regardless of the type of connector or when a rigid connector was used for either group. The number of intruded teeth was significantly greater in patients with intact periodontal support (P=.03). CONCLUSIONS: Complete-arch fixed prosthesis supported by implant and tooth abutments may be associated with intrusion of teeth with intact periodontal support when nonrigid connectors are used to join the implant- and tooth-supported sections of the prostheses. However, fixed partial dentures supported by implants and teeth with reduced periodontal support were not associated with tooth intrusion, regardless of the type of connectors used.

Adult↗
PubMed2006

Combination fixed and removable prostheses using a CoCr alloy: a clinical report.

It is now possible to provide combination fixed/removable prosthetic restorations using only 1 dental alloy, such as CoCr, a nonprecious alloy. This alloy offers clinical performance and demonstrated corrosion resistance. This clinical report demonstrates use of a single CoCr alloy for metal-ceramic fixed partial dentures in conjunction with a mandibular removable partial denture.

Adult↗
PubMed2006

A prosthetic treatment approach for a cherubism patient: A clinical report.

Cherubism is an early childhood disease that primarily involves the mandible and consists of painless mandibular enlargement with or without maxillary involvement and progresses rapidly over the course of several years. This clinical report describes the fabrication of maxillary fixed partial dentures and a mandibular overdenture for a 21-year-old man with cherubism.

Adult↗
PubMed2003

Inlay fixed partial denture as a conservative approach for restoring posterior missing teeth: a clinical report.

Inlay fixed partial dentures luted by use of adhesive procedures offer a clinical alternative for the restoration of single missing posterior teeth. The introduction of ceromers and fiber-reinforced composites and the continuous improvement of adhesive systems and luting agents make this type of restoration possible, offering good aesthetic and functional results. The procedure is minimally invasive and conservative. This clinical report reviews the factors influencing the diagnosis and the clinical indications for an inlay fixed partial denture. In addition, a patient treatment is presented to illustrate the clinical procedures involved.

Adult↗
PubMed1995

In vitro changes in clips and bars used to retain implant overdentures.

Although implant-retained overdentures are a less expensive alternative to fixed implant-supported prostheses in certain situations, problems with retentive clips fracturing and needing frequent replacement have been reported. This study compared baseline and posttest retention of metal and plastic clip-retained overdenture analogs and monitored surface changes in bars and clips throughout the testing process. A laboratory model was made with two implant analogs processed into an acrylic resin platform to which three bars were fitted. Two overdenture analogs were made and retained on the model with metal or plastic clips. Each bar-clip assembly was subjected to 5500 insertion and removal cycles to simulate 3 years of in vivo insertion and removal. Although the differences in retention between metal and plastic clips and between clips before and after testing were statistically significant, it is questionable whether they are clinically significant. Neither clip fracture nor loss occurred during this study, which suggests that it may be functional or parafunctional loading and not repeated insertion and removal of an implant overdenture that may cause the stated problems.

Acrylic Resins↗
PubMed1978

Stresses from loading distal-extension removable partial dentures.

A concentrated load of 222 N in the region of the central fossa of the second molar resulted in stresses in the supporting bone which increased gradually from zero in the region of the retromolar pad to about 25 MN/m2 distal to the second molar. Stresses in the alveolar bone supporting the second premolar were about 30 MN/m2 at the cemento-enamel junction, decreased to about 20 MN/m2 distal to the apex of the root, increased to 100 MN/m2 at the apex, and decreased to 3 MN/m2 near the mesial upper third of the root surface. When a distributed load of 222 N was applied to the first and second molar region, the stress distribution was similar to that observed for the concentrated load, and stress magnitudes were about 20% lower. Dramatic decreases in stress, with the maximum stress at the apex being 40 MN/m2, occurred when a 222 N load was distributed in the area of the marginal ridge.

Bicuspid↗