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Results for “Prosthesis Retention”

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At least 1,279 records · Page 71Linked to original sources
PubMed1991

Tissue integration of one-stage ITI implants: 3-year results of a longitudinal study with Hollow-Cylinder and Hollow-Screw implants.

This study examined the tissue integration of one-stage, nonsubmerged ITI implants over a period of 3 years. Fifty-four implants were placed in 38 partially edentulous patients. Following healing (at least 3 months), all 54 implants were free of peri-implant infections and revealed no detectable mobility. Radiographs showed no signs of peri-implant radiolucencies, and the implants were in favorable positions for prosthetic restoration. Following incorporation of fixed partial dentures, patients were enrolled in a hygiene recall program with 3-month intervals and were examined once a year. Based on predefined criteria, each implant was classified as successful or failing. After the 3-year observation period, 51 of 53 implants (96.2%) were considered successfully integrated. (One patient with one implant dropped out of the study.) Two implants exhibited recurrent peri-implant infections and were classified as late failures. These results indicate that one-stage ITI implants can achieve successful tissue integration on a predictable basis and that it can be maintained over a period of at least 3 years.

Dental Implants↗
PubMed1991

Effect of time of onset and depth of infection on the outcome of total knee arthroplasty infections.

The treatment results of 24 infected total knee arthroplasties with a minimum follow-up period of two years are presented. The most common pathogens were coagulase-positive staphylococci (50%), coagulase-negative staphylococci (29.2%), and enterococci (12.5%). Eleven patients with early postoperative infections (occurring within one month of prosthesis implantation) were treated with debridement, retention of the prosthesis, and intravenous antibiotics. Treatment was successful in all five patients with superficial infections not extending into the joint. In six patients with deep infections, treatment was successful in only two (33%), despite a longer course of antibiotic therapy (four to six weeks) and the use of tobramycin-impregnated polymethylmethacrylate beads. Three patients continued to have recurrent drainage, and one patient was subsequently successfully treated with a delayed exchange arthroplasty. Thirteen patients were diagnosed with late infections. One patient with a late, superficial infection and another with an acute (hematogenous seeding), deep infection were successfully managed with debridement and intravenous antibiotics. Prosthesis removal was not required. Eleven patients presented with late, deep infections. Of three patients who were treated without removal of the prosthesis, infection was arrested in only one. The remaining eight patients were treated with debridement, intravenous antibiotics, tobramycin-impregnated polymethylmethacrylate beads, and delayed exchange arthroplasty. The median interval to reimplantation was eight weeks (range, seven to 25 weeks). Treatment was successful in six cases (75%). The overall success rate in the treatment of total knee arthroplasty infections was 71%. In 19 patients with deep infections, treatment success was seen in 78% of patients treated with delayed exchange arthroplasty, but this value was only 40% in patients who were not treated with prosthesis removal.(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗
PubMedDate not supplied

[Osseointegration of IMZ implants. Ultrastructural analysis of a case].

A study with scanning electron microscope of an osseointegrated titanium implants (IMZ) was performed, analyzing the characteristics of the interface bone--titanium oxid. It was observed that the characteristics of the interface were similar to the ones shown by other devices whose design is different (Branemark system). The present study confirms that an adequate surgical technique and a satisfactory post-operation on phase (in which the implant is free of load) lead to the osseointegration of the implant; this facts is proved by the absence of mobility of the device, and also by structural findings typical of normal osseous tissue.

Adult↗
PubMed1990

[Biometric studies on implanted and natural abutments].

The mobility of 50 osseointegrated implants, inserted for improvement of the support of dentures in edentulous lower jaws, was studied during a period of up to 3 years by means of mechano-electronic measurements. The results showed that 3 months after implantation osseointegrated implants have less quasi-static mobility than natural teeth without periodontal lesions. Under the stresses of mastication the mobility of osseointegrated implants continuously increases. After 2-3 years, implants show a similar mobility as natural teeth supporting comparable denture constructions. The Periotest readings of implants were significantly lower than those of natural teeth, largely independent of the date of mobility measurement. A prognosis of functional properties as well as predicting the impending loss of osseointegrated implants is possible with the aid of long-term mobility measurements.

Aged↗
PubMed1989

The retention of titanium pins in high-copper amalgam and their influence on its fracture resistance.

The influence of titanium pins on the fracture resistance of amalgam and the retention of amalgam by titanium pins were compared to that of stainless-steel pins. The retention of stainless-steel pins embedded in amalgam to various depths was also evaluated. None of the pins had a significant influence on the compressive fracture resistance of amalgam. All pins embedded to standard depth in amalgam failed in tension, with titanium pins demonstrating the lowest resistance to tensile forces. Stainless-steel pins embedded 1.75 or 1.5 mm and loaded in tension caused failure in the amalgam, but at forces comparable to the retention of such pins in dentin.

Copper↗
PubMedDate not supplied

Nonlinear contact analysis of preload in dental implant screws.

Clinical studies indicate that loosening or fracture of dental implant prostheses occurs in 5% to 45% of cases during the first year. The nature of loosening or displacement of prosthetic components is complex, since it involves cycling fatigue, oral fluids, and varied chewing patterns and loads. A finite element contact analysis method was used to study the load-transfer mechanism between prosthetic components caused by torque application to the threaded fasteners used for assembly. Screw elongation is achieved while allowing for elastic recovery of the screw to produce a clamping force on the fastened elements. Clamping forces were additive along the axis of the prosthetic components. When the gold retaining screw is fastened into the abutment screw, clamping force on the implant is increased at the expense of decreasing the clamping force at the abutment screw-abutment interface by 50%. Maximum tensile stresses in the screws after preload were less than 55% of the yield stress.

Bite Force↗
PubMedDate not supplied

Provisional implant-supported fixed restorations.

Implant-supported provisional restorations serve several valuable functions. In the anterior region, they are beneficial in determining the best restorative design, ultimately allowing for the most appropriate definitive prosthesis. They also provide a template around which soft tissue contours may be evaluated and manipulated. In areas where bone quality is compromised and implant success is suspect, whether it be anteriorly or more likely posteriorly, implant-supported provisional restorations may be used to "test" the osseointegration prior to fabricating and placing the definitive restorations.

Dental Abutments↗
PubMed1995

Restoring malaligned implants: clinical and technical perspectives.

Despite careful attention, implants occasionally are placed at less than ideal angles. A combination of techniques can be implemented in the laboratory to correct malalignment. The "thread-timed impression" technique to assist with these restorations is described.

Dental Abutments↗
PubMedDate not supplied

Purge-and-trap gas chromatographic-mass spectrometric determination of benzene in denture adhesives.

A purge-and-trap gas chromatographic-mass spectrometric procedure is presented for determination of trace levels of benzene in denture adhesives and their raw materials. The limit of quantitation is 10 ppb, reproducibility is +/- 10%, and recoveries of d6-benzene are 70-85%. Results of a nationwide survey of 109 finished products and their raw materials representing 32 brand name products from 17 manufacturers are reported.

Adhesives↗
PubMedDate not supplied

Deflection of superstructure and stress concentrations in the IMZ implant system.

The finite element method was used to model a 4.0 x 13.0-mm IMZ implant restored with a cast gold crown to examine the relationship between deflection of the prosthetic superstructure and stress concentrations in the retaining screw using both the polyoxymethylene intramobile element and the analogous titanium element under various loading conditions. A strong correlation was observed between the peak stresses in the screw and the deflection of the superstructure. Deflections and stress concentrations generally increased with increases of either the load magnitude or the load angle. Greater deflection and stress concentrations within the coronal retaining screw were predicted with the use of the resin IME than with the titanium element.

Bite Force↗
PubMedDate not supplied

Computer-aided design and transverse strength of screw-retained attachments.

Two commercially available, screw-retained attachments and an experimental attachment were modeled and analyzed by computerized finite element method. Mechanical test specimens were then developed. Cast rectangular bars were fabricated with the attachments or were joined by soldering at midspan as a control. These bars were subjected to three-point loading. The soldered connector was stronger than the three attachment designs, and the experimental attachment was stronger than the two commercial products. There was general agreement between the mechanical and finite element testing. The use of computer-aided technology to design dental devices with improved mechanical properties was demonstrated by this study.

Analysis of Variance↗