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Results for “Denture Precision Attachment”

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PubMed1978

Visualization of stress and strain related to removable partial denture abutments.

The following conclusions are based on the conditions set forth in this investigation and apply to forces acting through a vertical direction of application only: 1. The unilateral removable partial denture produced no more stress than the bilateral removable partial denture. 2. The fully active Dalbo removable partial denture resulted in the greatest stressbreaking action. 3. The rigid Dalbo removable partial denture resulted in the least ridge displacement. 4. The rigid Dalbo removable partial denture resulted in the greatest stress concentrations in the distal abutment. 5. None of the attachments tested resulted in a distribution of the stresses along the edentulous ridge. 6. The use of two abutments (double abutments) resulted in greater stress concentrations in the distal abutment than the use of single abutments. 7. Forces in the single abutment were resisted along the long axis of the root. 8. Forces in the double abutments were resisted along the long axis of the distal abutment.

Alveolar Process↗

PubMed1997

An analysis of satisfaction with complete immediate (over)dentures.

OBJECTIVES: The purpose of the study was to investigate denture satisfaction related to treatment modality, age, gender, denture quality, chewing ability, denture experience and patients' attitude towards denture wearing. METHODS: In a randomized controlled clinical trial 74 patients who required immediate denture therapy were treated either with complete immediate dentures, or with complete immediate overdentures on the lower canines with and without Dyna Direct magnetic attachments. All patients were evaluated clinically and by questionnaires over a one year period after denture insertion. RESULTS: Regression analysis showed that the quality of the denture, chewing ability, attitude towards dentures in general and the expectation of the new dentures can explain the variance in denture satisfaction for 23-27%. CONCLUSIONS: It can be concluded that with respect to satisfaction the technical quality of the dentures, as well as patients' previous attitude towards wearing dentures are the most important factors in immediate denture treatment. The treatment modality, having received an overdenture or not, appeared to be unimportant in this respect in the first year after denture insertion.

Attitude to Health↗

PubMedDate not supplied

Prospective evaluation of implants connected to teeth.

PURPOSE: This prospective clinical trial examined the effect on teeth and implants when rigidly or non-rigidly connected in a cross-arch model. MATERIALS AND METHODS: Thirty patients received 2 implants, 1 on each side of the mandible, and were restored with 3-unit fixed partial dentures connected either rigidly or non-rigidly to an abutment tooth. Patients were followed for at least 5 years post-restoration. RESULTS: Repeated-measures analysis revealed no significant difference in crestal bone loss at implants (rigid versus non-rigid methods). An overall significant difference (P < .001) was found comparing methods for teeth. Paired t tests revealed no significant differences in crestal bone levels for implants or teeth at the 5-year recall. Kaplan-Meier methods and the Cox proportional hazards model showed no differences between attachment methods with regard to success based on survival and bone loss criteria. During the 5-year recall period, 1 implant (rigid side) was removed. Four implants developed bone loss greater than 2 mm during the course of this trial. One tooth on the rigid side and 2 teeth on the non-rigid side had greater than 2 mm of crestal bone loss and were removed secondary to fractures. In all, 5 abutment teeth were removed, all of which had been treated with root canal therapy and fractured at the interface of the post within the tooth. There was no clear relationship of tooth fracture to attachment. Repeated-measures analysis of mobility values revealed no significant changes over the time course of this study, and paired t tests revealed no statistically significant differences between implants for mobility. Repeated-measures analysis and paired t tests for probing depth revealed no significant changes over the time course of this study. There were no significant differences in soft tissue indices for either attachment method. The percentage of patients who had measurable intrusion was 66% for the non-rigid group, and 44% for the rigid group; 25% of the non-rigid teeth had greater than 0.5 mm intrusion, compared with 12.5% for the rigid group. For the 2 time periods evaluated, there was no significant increase in intrusion over time. The non-rigid-side implant required more nonscheduled visits to treat problems than the rigid implant and the teeth. DISCUSSION: Most patients were treated successfully with rigid or non-rigid attachment of implants to teeth. CONCLUSION: The high incidence of intrusion and non-scheduled patient visits suggest that alternative treatments without connecting implants to teeth may be indicated.

Adult↗

PubMed1993

Maxillary distal-extension removable partial denture abutments with reduced periodontal support.

An in vitro study that used photoelastic models compared stress distribution characteristics of three maxillary, bilateral, distal-extension removable partial denture designs when the abutments were subjected to a progressive loss of periodontal support. One design used I-bar retention, a second design used a semiprecision, spring-loaded plunger attachment, and a third design used the ERA attachment. Both attachment designs were tested with and without splinted abutments. The ERA design was also tested with and without supporting rests and included light and heavy retention elements. Periodontal support loss up to 35%, a 60/40 crown-to-root ratio, resulted in increased stress concentrations. The ERA design with supporting rests, light retention elements, and splinted abutments compared very favorably with the I-bar retained design on nonsplinted abutments.

Alveolar Bone Loss↗

PubMed1986

The mandibular staple bone plate. Its use and advantages in reconstructive surgery.

The mandibular staple bone plate is a reconstructive device that will attach to the inferior border of the mandible and will orthopedically provide for prosthetic and jaw stabilization in the edentulous mandible and the deformed mandible. It can be useful in a variety of clinical settings and is adaptable to a number of prosthetic needs. It is cost-effective and has demonstrated osteointegration in over 91 per cent of cases. The cumulative rate of success for 5 to 6 years is 94.6 per cent.

Biocompatible Materials↗

PubMed1986

The use of an attachment system for overlay prostheses.

The attachment system presented offers a prefabricated pin and post technique or use of a plastic pattern in a metal casting. Both provide the advantages of positive retention, stress-breaking effect, ease of maintenance, clinical or laboratory activation, and simplicity of technique. Both have the disadvantages of nonadjustable retention, nonparallelism of post portion to root axis, and unknown long-term effect. The casting system is the preferred method because of its accurate fit and smaller occlusal height.

Crowns↗

PubMed2004

An eight-year follow-up to a randomized clinical trial of participant satisfaction with three types of mandibular implant-retained overdentures.

Studies have shown that mandibular implant overdentures significantly increase satisfaction and quality of life of edentulous elders. Improved chewing ability appears to have a positive impact on nutritional state. Therefore, it is important to determine the best design of this prosthesis over the long term. In this randomized controlled trial, three groups of edentulous participants with atrophic mandibles wore 3 types of implant overdentures. During an eight-year follow-up, only seven of the 110 participants had dropped out of this study. Almost all participants were still satisfied with their overdentures. Participant satisfaction concerning retention and stability of the mandibular overdenture had decreased significantly in the two-implant ball attachment group, whereas the opinion of participants in the single- and triple-bar groups was still at the same level. The long-term results suggest that a mandibular overdenture retained by 2 implants with a single bar may be the best treatment strategy for edentulous people with atrophic ridges.

Aged↗

PubMed2003

Attachment dentistry. A rationale for reflection and treatment planning.

The article summarizes how, as general dentists, we can incorporate attachment dentistry into our daily practices. Most importantly, it speaks of why we should be considering using this modality in our treatment planning of fixed and removable prosthetics. Partial dentures should do more than just replace teeth. Special consideration has been taken to preserve soft tissue and protect weak aboutment teeth as well as to achieve a cosmetically pleasing result. This requires planning for success and results in a win-win situation for the patient and the dentist. The article discusses the segmentation of fixed prosthetics that considers healthy physiologic tooth movement in the initial planning stages.

Dental Abutments↗

PubMed2002

An overview of the O-ring implant overdenture attachment: clinical reports.

The O-ring is used to increase retention of implant complete and partial overdenture prostheses. They possess a number of advantages, including ease of use and maintenance, low cost, and possible elimination of a superstructure bar. O-rings wear over time, gradually lose retention, and must be replaced periodically. It is essential that O-ring abutments be parallel to each other. Two cases are presented showing the use of O-rings with a complete mandibular implant overdenture and a maxillary removable partial denture.

Aged↗

PubMed1998

Complications and primary failures related to fixed metal ceramic bridge prostheses made by dental students.

Porcelain fused to metal provides better aesthetics in fixed partial dentures than veneers with gold-resin that were used formerly. The aim of our study was to evaluate complications and primary failures of fixed metal ceramic bridge prostheses made by dental students. We studied 61 patients (32 women, 29 men, mean age 49 years, range 28-73 years) treated during years 1990-1993. Data were collected from the patient files. Altogether 82 bridges were made (mean 4.1 units, range 2-6), 221 abutments (mean 2.7, range 2-6) and 136 pontics (mean 1.6, range 1-4). Forty-seven cast cores were used in 29 bridges (mean 0.4 cores, range 1-3) and semiprecious attachments as an extra attachment in two bridges. Seven teeth were extracted due to complication and/or failure during endodontic treatment and root canal perforation during preparation. In two cases the abutment tooth was fractured by removing the old crown. Four unsuccessful bridges were remade and in seven cases the firing of porcelain was renewed. The study concludes that most common failures of fixed metal ceramic bridges made by dental students occur during root canal preparation of abutment teeth.

Adult↗

PubMed2006

[Composite resin copings for a perio-overdenture. A newly developed method of making copings for retention with spherical elements].

Today's dentistry should aim at minimizing cost, simplifying techniques, allowing procedural revi sions and finally at facilitating corrections and repairs. The development of direct or indirect light-cured composite resin copings, coupled with ball attachments (Dalbo-Rotex according to Brunner) and a suprastructure which is veneered by means of light-cured composite or acrylic resin, may offer a cost-effective perio-overdenture without compromising on periodontal health and providing optimal esthetics. Since July 2003, eighteen new perio-overdentures with a total of 70 copings made of light-cured microhybrid composite resin were delivered. The aim of this article is to discuss the technical aspects and preliminary results regarding this technique.

Aged↗

PubMed1989

A modification of the Thompson dowel rest for distal-extension removable partial dentures.

A prefabricated Thompson dowel rest semiprecision attachment system for distal-extension removable partial dentures deserves consideration in the treatment planning of periodontally involved dentitions. It is a system that provides for rotation and therefore stress-breaking with controlled movement. Many other stress-breaking systems provide for rotation without specific control. In addition, the Thompson dowel rest system is the only stress-breaker that is intracoronal not extracoronal. This prefabricated system offers facilitation of laboratory procedures, eliminates the need for utilization of gold for dowels, reduces the size of the rest seats, and aids in the preservation of the integrity of the hard and soft supporting tissues.

Denture Design↗

PubMed2004

A prospective evaluation of Frialoc implants with ball-abutments in the edentulous mandible: 1-year results.

Several surgical and prosthetic concepts for the treatment of patients with mandibular atrophy and related lower denture problems are proposed and described in the literature. The present study discusses and evaluates the use of a new single-stage implant and overdenture with ball-attachment for this purpose. This study evaluates the clinical performance of the implants and abutments and addresses surgical and prosthetic complications that were encountered. Eighteen fully edentulous patients received two, single-stage Frialoc implants (Friadent, Mannheim, Germany). The implants were left to osseointegrate for 3 months and were subsequently provided with ball-abutments and loaded through a mandibular overdenture. After 1-year of clinical service, two implants were lost, which accumulated to a 1-year survival rate of 93.9% (SE 4.2%). Patient satisfaction was high, and prosthetic complications and postinsertion maintenance were minimal. Three abutments loosened, one of which subsequently broke after 5 months of loading. Retightening of the attachment (gold matrix) was performed on seven occasions in four patients. Soft tissue response was excellent. Although minor hypertrophy of the peri-implant mucosa was observed, hardly any marginal bone loss between baseline and 1-year observations occurred. Short-term results indicate that mandibular implant overdenture treatment by means of two ball-abutments, using Frialoc implants and prosthetic components, leads to good clinical results, both from an objective and a subjective perspective.

Aged↗

PubMed1985

Nonlocking types of semiprecision attachments.

The history of the nonlocking type of intracoronal semiprecision rest has been traced from its origins with Neurohr in 1930, up to its present use as the Thompson dowel rest. The advantages of the use of this deep rest design and the clasp arm design for primary retention have been discussed. The Blatterfein modification of the lingual clasp arm has been introduced to overcome the problems of breakage and lack of stabilization that are present with the Thompson, Van Dam, and Wands designs. Several clinical situations have been illustrated demonstrating the variety of applications of the Thompson dowel rest type of semiprecision prostheses.

Dental Abutments↗

PubMed1997

Overdenture retention and stabilization with ball-and-socket attachments: principles and technique.

Implant attachments of various designs are used to retain, stabilize and sometimes support overdentures. Tissue supported overdentures stabilized and retained by two to four implants are often the restorations of choice due to patient preference, limitations in finances, insufficient available bone to accommodate a greater number of implants, or needed improvements in esthetics, phonetics and oral hygiene. Female retentive sockets in the overdenture base that snap onto male ball abutments offer such advantages as reduction in hydraulic resistance to coupling, lower functional stress on the implants, retention that can be adjusted downward, easy component replacement and only relatively parallel abutments.

Dental Abutments↗

PubMed1998

A 5-year randomized clinical trial on the influence of splinted and unsplinted oral implants in the mandibular overdenture therapy. Part I: Peri-implant outcome.

Thirty-six completely edentulous patients were enrolled for a 5-year prospective study testing the treatment outcome between splinted and unsplinted implants retaining a mandibular hinging overdenture. The patients were randomized into 3 groups of equal size depending on the attachment system used such as: magnets, ball attachments or bars (reference group). Only 1 implant out of the 72 had failed at the abutment stage. Not a single implant failed during the 5-year loading period. The accumulation of plaque was significantly higher for the Magnet than for the Ball group. Bleeding on probing, as well as marginal bone level, attachment level and Periotest values did not statistically differ among the groups, neither at year 1 nor at year 5. However, the Periotest values were significantly lower at year 5 compared to year 1 for all groups, which indicates a higher rigidity at the bone-implant interface. No correlation was found between bleeding on probing and marginal bone loss. We conclude that the connection state of 2 implants retaining a hinging overdenture did not influence the peri-implant outcome.

Adult↗

PubMed1985

Crown preparations for semiprecision attachment removable partial dentures.

The utilization of intracoronal or extracoronal removable partial denture attachments in conjunction with a fixed retainer applies additional stresses to the structural durability of the fixed retainer and its integrity with the underlying abutment. Therefore, the utilization of this attachment with a fixed retainer requires understanding and diligent application of the basic principles of fixed prosthodontics.The primary objective of prosthodontics must be the preservation and health of the remaining existing tissues and structures: teeth, periodontal tissues, temporomandibular joint, and oral facial muscles. This must be of primary importance as we achieve our goals of (1) eliminating existing pathology, (2) restoring morphology and function, and (3) improving esthetics and thereby heightening self-esteem and the psychological well-being of the individual. These objectives make us sensitive to the considerations we have discussed in preparation design and the tissue management required in the fabrication of fixed retainers.

Crowns↗

PubMed1997

[Effect of stud attachment post design on dentin stress distribution].

The shape design of attachment post is crucial factors influencing post retention and stress distribution to the dentin. By means of CAD and FEA, the present study investigated the effects of the shape designs of attachment posts on the stress distribution in dentin. The results indicated that the taper post had wedging effects on the dentin and produced higher Von Misses stress than that of parallel side post and the Von Misses stress value of the dentin was about 1.1 times. The maximum Von Misses stress value that the design of the thread post produced was about 1.06 times the stress of the nonthread post did. However, the effects of post design on the dentin were minor compared with the bite force directions. In the same post design, the maximum Von Misses stress in dentin with 45 degree oblique force was about 2.1 times with vertical force. Therefore, reducing oblique force is the main method to prevent root fracture in clinic.

Computer-Aided Design↗