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At least 397 records · Page 22Linked to original sources
PubMed1979

Occlusal force transmission by overdenture attachments.

This investigation utilized a composite photoelastic model to examine the load-transfer characteristics of several overdenture attachments. Tissue bar (Hader and King Connector) and stud (extracoronal) attachments (Rotherman, Gerber, and Ancrofix) were studied. The following observations may provide guidelines for the selection of overdenture attachments. 1. The more retentive tissue bar and extracoronal attachments produced higher stress concentrations. 2. Of the tissue bars tested, the Hader Bar produced less torquing forces on the abutment teeth. 3. The Ancrofix appeared to share the forces of occlusion between abutments and the posterior edentulous regions. 4. It must be emphasized that several other factors will also influence the choice of overdenture attachments, such as the judgment of the dentist, economics with respect to the patient, and the availability of laboratory expertise.

Alveolar Process↗
PubMed2005

The role of abutment-attachment selection in resolving inadequate interarch distance: a clinical report.

A critical factor that needs to be evaluated during the diagnosis and treatment planning phase for patients seeking an implant-tissue-supported overdenture or metal-resin implant fixed denture is the presence of adequate interarch distance. The amount of interarch distance is critical to the selection of appropriate implant abutments and attachments for both implant-tissue-supported overdentures and metal-resin implant fixed complete dentures. This clinical report describes a patient with complications related to the failure to diagnose inadequate interarch distance, and the methods used to resolve the patient's chief complaint. A guide for abutment-attachment selection using one commercially available implant system is given.

Aged↗
PubMed2002

Restoration of divergent free-standing implants in the maxilla.

Divergent implants in the maxilla can make restoration with removable prosthetics difficult when the implants will not be splinted with a superstructure. Attachments to be used with individual implants require that the implants be within 10 degrees of divergence. This article will address a new angled male designed to fit the locator attachment (female component) that can accommodate up to a 40 degrees divergence.

Dental Abutments↗
PubMed1998

A case report of removable partial denture using the dimple-bar telescopic system.

The authors have devised a new attachment for a removable partial denture with a dimple-bar clasp, guiding channels, and a shoulder, named the dimple-bar telescopic system. This system has advantages over the clasp-type retention device in that it not only satisfies esthetic requirements, but also improves the handling and adjustability of the attachment denture. Furthermore, it was shown clinically that the dimple-bar telescopic system was free from food impaction when used as an intracoronal attachment, and maintained a feeling of comfort during tongue movement and speech. We present a typical case in which the dimple-bar telescopic system was used.

Crowns↗
PubMed1997

Patient satisfaction with implant-supported mandibular overdentures. A comparison of three treatment strategies with ITI-dental implants.

In a randomized, controlled clinical trial, 110 edentulous patients with atrophic mandibles were treated with International Team for Oral Implantology-dental implants using three different treatment strategies: a mandibular overdenture supported by two implants with ball attachments, two implants with an interconnecting bar, or four interconnected implants. The patients' opinions and their social functioning were evaluated by means of a questionnaire directly before and 16 months after treatment. Before treatment most patients had complaints about the retention of their mandibular denture. Sixteen months after treatment almost all patients were generally satisfied with their dentures. Since no significant difference was found between the three treatment strategies, it was concluded that simple implant treatment such as an overdenture retained by two ball attachments is sufficient.

Analysis of Variance↗
PubMed1998

A retrospective study of combined fixed-removable reconstructions with their analysis of failures.

The survival rate and the reasons for failures of 130 combined fixed-removable reconstructions (CFR), incorporated in 112 patients, were assessed. Each CFR reconstruction was classified depending on its attachments: 76 reconstructions were attached with rigid, precise attachments, and constituted the rigid group; 54 reconstructions were attached with either semi-precision or individual attachments and were defined as the semi-rigid group. Of the 130 reconstructions, 41 were determined as complete successes, 39 as partial successes and 50 as failures, leading to 37 major repairs and to 13 new reconstructions. Three reconstructions failed due to technical reasons, 36 due to biological reasons and for 11 reconstructions, both categories of reasons were responsible for their failure. In total, technical reasons were counted 15 times in comparison to 73 biological reasons for those 50 failed reconstruction, with 29 fractured abutment teeth as the most common biological reason. Within the rigid group, 45 failed reconstructions were observed, whereas within the semi rigid group only 5 failures occurred, leading to an 8-year survival estimate (+/- SD) of 30.1% (+/- 6.9%) for the rigid group and 93.1% (+/- 3.9%) for the semi rigid group. Beside the attachment type, the anatomy of the partially edentulous tooth arch in form of the free-end situation and the dentate opposing jaw were identified as risk factors.

Adult↗
PubMed1993

Osseointegrated dental implants with ball attachments supporting overdentures in patients with mandibular alveolar ridge atrophy.

Brånemark dental implants with ball attachments supporting overdentures were used as alternative treatment to combined lingual-vestibuloplasty with free split-thickness skin graft and removable dentures in 25 consecutive patients with mandibular alveolar ridge atrophy. Ninety-three fixtures were placed. Ball attachments were mounted on the fixtures, and implant-supported overdentures were inserted 3 to 4 months after fixture placement. The observation period after implant activation and prosthesis insertion varied from 12 to 27 months with a median observation period of 18 months. The overall success rate of individual implants was 97% (90/93). The prosthesis function rate was 100% (25/25). The 1-year success rate of individual implants was 98% (91/93) with a prosthesis function rate of 100% (25/25). No persistent surgical or prosthodontic complications were observed. Preliminary results indicate that osseointegrated Brånemark dental implants with ball attachments supporting overdentures can be a successful alternative to combined lingual-vestibuloplasty with free split-thickness skin graft and removal dentures in patients with denture problems related to mandibular alveolar ridge atrophy.

Aged↗
PubMed2000

The partial overdenture in management of anterior apertognathia: a clinical report.

A patient with anterior apertognathia presented with an unserviceable maxillary removable partial denture. The unique pattern of partial edentulism was treated with a partial overdenture restoration of the bar attachment design. The final prosthesis was stable, well retained, and esthetic, serving as a conservative alternative to a surgical-orthognathic plan of treatment.

Adult↗
PubMedDate not supplied

Does a prosthodontist spend more time providing mandibular two-implant overdentures than conventional dentures?

PURPOSE: In this article, the time taken by a prosthodontist to fabricate and maintain mandibular overdentures retained by two implants and conventional dentures is compared. MATERIALS AND METHODS: Sixty edentulous patients between the ages of 65 and 75 completed a randomized clinical trial. All received new maxillary conventional dentures and either a mandibular conventional denture (n = 30) or a two-implant overdenture on ball attachments (n = 30). The time spent by the prosthodontist and the number of visits required for treatment, including both scheduled and unscheduled visits, were recorded for each patient from preliminary impressions to 6 months following delivery. Data from the two groups were compared using Mann-Whitney U tests. RESULTS: The prosthodontist spent a mean total time of 296 minutes in treating an implant overdenture patient and 282 minutes on a conventional denture patient during the period from preliminary impressions to the 6-month follow-up. The mean numbers of appointments were 10.1 (implant group) and 10.8 (conventional group). These differences were not significant. CONCLUSION: Although additional knowledge is required to treat patients with implant prostheses, the time required by the prosthodontist to provide two-implant mandibular overdentures with ball attachments was not significantly different than the time needed for conventional denture treatment.

Aged↗
PubMed2002

Comparison of 2 retentive systems for implant-supported overdentures: soft tissue management and evaluation of patient satisfaction.

BACKGROUND: The aim of the present study was to compare the peri-implant soft tissue health status of implants supporting overdentures with bar attachments or ball attachments in the mandible, as well as patient satisfaction with these attachment types. METHODS: The study included a Dolder bar group with 18 cases (43 implants) and a ball attachment group with 18 cases (51 implants). The mean function period in the Dolder bar group was 49 months (range: 12 to 72 months) and in the ball attachment group, the mean was 23 months (range: 12 to 40 months). Implants were clinically evaluated by using a modified plaque index (mPI), modified sulcus bleeding index (mSBI), and probing depths. Patient satisfaction with the treatment was recorded using a questionnaire. RESULTS: mPI, probing depth, and mSBI did not statistically differ between groups (Mann-Whitney U test, P > 0.05). Patient satisfaction was similar with both retentive systems. CONCLUSION: Within the limits of this study, we concluded that there was no significant difference between the 2 attachment types used for implant-supported overdentures with respect to the soft tissue health status or patient satisfaction.

Adult↗
PubMedDate not supplied

Prefabricated metal intracoronal semiprecision attachments for removable partial dentures.

The inaccuracies of the casting and fitting processes associated with semiprecision intracoronal attachment systems may compromise the fit of the completed prosthesis. The objective of using metal prefabricated intracoronal semiprecision attachments is to improve the adaptation between the matching attachment surfaces used in the fabrication of removable partial dentures. In milled dovetail or waxed dowel rests, the attachment of one side is completed and the other is cast to match. The prefabricated attachment system presented uses a matching component cast directly against the precast metal rest-mandrel. This reduces the inaccuracies resulting from waxing, investing, and casting.

Denture Design↗
PubMed1996

A double cast fixed detachable prosthesis for the correction of severely angulated implants.

Unfavorable angulation of dental implants is a common complication that may make the design of the prosthetic device difficult and may compromise its function, access for oral hygiene procedures, and esthetic appearance. When the use of angulated abutments makes the prosthetic design unaceptable, the use of a double cast fixed detachable prosthodontic procedure may be required, which includes a cast substructure retained with conventional set screws to support a cast metal ceramic superstructure retained by semiprecision attachments and friction. This procedure improves access for oral hygienic procedures and offers better control over the esthetics and the function of the restoration.

Dental Casting Technique↗
PubMed2001

Orientation of retentive matrices on spherical attachments independent of implant parallelism.

Traditionally, it has been advocated that implants planned for use as overdenture abutments be placed parallel to each other to obtain predictable attachment retention and complete seating of the restoration and to prevent premature wear of components. However, it is often difficult or impossible to place implants parallel to each other, and patients with implants that have already been placed in a variety of positions frequently are referred to restorative dentists. This article describes a technique for the fabrication of a matrix-paralleling device as well as 2 of its uses. The device allows proper orientation of the retentive matrices to establish a common path of withdrawal for the prosthesis and all attachments. Provided that the matrices are parallel to each other, spherical overdenture attachments can be used even when the implants are not parallel.

Acrylic Resins↗
PubMed2004

The attachment-retained overdenture.

Attachments are rigid or resilient connectors that redirect the forces of occlusion. Attachments have been used in dentistry for more than 100 years, and have provided dentists with a means for protecting weak abutment teeth, preserving soft tissue, maintaining physiologic occlusion and enhancing patient satisfaction and comfort.

Dental Abutments↗
PubMed1995

Prospective clinical evaluation of mandibular implant overdentures: Part I--Retention, stability, and tissue response.

Seventeen subjects with preexisting conventional complete dentures were evaluated in this prospective clinical study. Two implants were placed bilaterally in the anterior mandible. In a crossover experimental design, the conventional dentures were modified, and the retention, stability, and tissue response for conventional dentures were compared with implant overdentures that had O-ring and magnet overdenture attachments for all subjects. The study indicated statistical superiority of the implant overdenture to the conventional denture. The O-ring attachment proved significantly better than the magnet attachment for retention and stability. The soft tissue response showed a slight but significant improvement with implant overdenture therapy.

Cross-Over Studies↗
PubMed1985

Diagnosis and management of partially edentulous cases with a minimal number of remaining teeth.

A systematic approach to establishing the diagnosis and determining the treatment plan for partially edentulous cases having a minimal number of remaining abutment teeth has been presented. In most of these types of cases, consideration should be given to how the transition to a complete denture will be accomplished at a later date when and if it becomes necessary. Whenever possible, the minimal number and simplest attachments should be used, always keeping in mind how often and what kind of maintenance procedures are employed (for example, changing the male of a Zest anchor, or Ceka attachment). The patient should be made aware of these procedures when the case is presented and should be informed about the periodontal and prosthodontic requirements for after care. Fees should also be discussed in detail.

Bicuspid↗
PubMedDate not supplied

Rigid connections between natural teeth and implants: a technical note.

In the posterior partially edentulous jaw, implants may be used to supplement existing natural dentition. Frequently, the maxillary sinuses and the mandibular nerve preclude the fabrication of freestanding implant-retained prostheses. However, if an implant and a natural abutment are combined, a fixed prosthesis can be fabricated, restoring the arch into the premolar area. The histories of three patients with attachments connecting implant-retained ceramotitanium crowns with crowns on natural abutments are described. A design for a rigid custom-made attachment for the Brånemark system, using standard components with a machine-duplication, spark-erosion technique, is suggested.

Bicuspid↗