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PubMed1978

Anterior rests for maxillary removable partial dentures.

Positive anterior rests were shown to be an essential element of design when considering stress distribution with a removable partial denture involving anterior teeth. Proximal plates often added stability and reduced stress accumulation in any one region. Distobuccal forces on the extension base adversely affected the primary canine abutment. Forces in the regions of the anterior base and central incisor abutment produced the most widespread transmission of stress throughout the arch. Greater stress throughout the arch was observed when forces were applied to the central incisor rather than to the right canine abutment. There is a need for established criteria of rest form and placement. Guidelines for using the natural crown as opposed to a positive rest seat in a restoration are needed. Continuing studies of other anterior rest forms should increasingly clarify this phase of treatment planning. The dentist should recognize the need for structural integrity in the anterior maxillary segment when designing removable partial dentures. A practical, defensible rationale for the routine use of maxillary anterior teeth as removable partial denture abutments must be established.

Dental Abutments↗

PubMed2003

Multidisciplinary approach to restoring anterior maxillary partial edentulous area using an IPS Empress 2 fixed partial denture: a clinical report.

Esthetics is a major concern during restoration of anterior partial edentulous areas. All-ceramic fixed partial dentures may provide better esthetics and biocompatibility in the restoration of anterior teeth. This clinic report describes a multidisciplinary approach and treatment procedures with an IPS Empress 2 fixed partial denture to restore missing anterior teeth.

Adolescent↗

PubMed1999

Quality of life assessment of bone-anchored fixed partial denture patients with unilateral mandibular distal-extension edentulism.

STATEMENT OF PROBLEM: Dental implants are expanding their use among partially edentulous patients. However, whether implants can promote the quality of life (QOL) of these patients has not been sufficiently examined. PURPOSE: This study compared the QOL level among implant denture, removable partial denture, and no restoration patients with distal extension type unilateral mandibular edentulism. MATERIAL AND METHODS: Three groups (n = 12 each) of subjects with unilateral mandibular distal-extension edentulism who were matched for age, sex, and missing teeth were studied. The groups were (1) implant denture, (2) removable partial denture, and (3) no restoration. QOL levels of these 3 groups were compared using a self-administered questionnaire with 3 major subscales: oral condition, general condition, and dental treatment. RESULTS: The implant denture group showed higher oral condition related QOL score than the other groups. There was no significant difference in oral condition-related QOL scores between the removable partial denture and no restoration groups. There was no significant difference in the general condition related QOL score and dental treatment-related score among the 3 groups. CONCLUSION: In unilateral mandibular distal extension edentulous patients, oral-condition-related QOL levels for dental implant patients were higher than those of removable partial denture or no restoration patients. The QOL levels of the removable partial denture patients were almost identical to those of no restoration patients.

Case-Control Studies↗

PubMedDate not supplied

Cement-retained implant-supported fixed partial dentures: a 6-month to 3-year follow-up.

This study presents a follow-up of 92 implant-supported fixed partial dentures that have been cement retained for 6 months up to 3 years. Included in the study were 41 women and 29 men. A total of 225 implants were placed (86 in the maxilla and 139 in the mandible). Fixed partial dentures, including single-tooth restorations, were temporarily cemented using Temp-Bond or IRM. Complications encountered were cement washout, procelain fracture, loose central screws, and implant failure. This study suggests an alternative to screw-retained prostheses; the method presented may lower the reported complications.

Adult↗

PubMed2003

Masticatory and nutritional aspects on fixed and removable partial dentures.

The aim of the present study was to evaluate mastication, food selection and nutritional aspects in two groups of persons restored with fixed (FPD, N=44) and removable (RPD, N=40) partial dentures respectively. The subjects were part of a cohort study of 67-68-year-old men living in Malmö, Sweden. The two groups were very similar regarding social factors and the inclusion criteria were chosen so that the groups were very equal regarding oral factors, apart from the difference in fixed and removable partial dentures. The number of natural teeth, number of replaced teeth and occlusal contacts did not differ significantly between the two groups, nor did the distribution of maxillary and mandibular dentures. A comprehensive examination of several general health factors included a home interview of dietary habits. A clinical examination included a 20-minute oral examination with registration of number of teeth, FPDs, RPDs, and occlusal contacts. It also included masticatory tests: chewing gum colour mixing, chewing gum bolus shaping, and swallowing threshold (number of strokes to the first swallow of an almond). The consumption of hard and soft foods was revealed by the dietary interview as well as the intake of energy and some nutrients. There was a significant difference between the groups regarding the capacity to mix the two-coloured chewing gum, to shape the chewing gum bolus and in the consumption of hard foods. There was no difference in the swallowing threshold and the consumption of soft foods. The intake of energy and nutrients did not differ significantly between the groups. The differences in masticatory capacity found thus seem to have little, if any, effect on the factors of importance for general health. A reasonable explanation for the differences found is that artificial teeth that are well retained, such as FPDs, make more active chewing possible than do removable, and often somewhat loose-fitting partial dentures.

Aged↗

PubMed1983

Technique for the repair of removable partial denture backings.

An easy and practical technique has been described for replacement of a removable partial denture retentive pin as an alternative to fabricating a new removable partial denture or reprocessing the acrylic resin part of the old metal framework. The technique uses the Hydroflame II soldering unit, which provides controlled, localized application of heat without damaging any acrylic resin that may be present.

Acrylic Resins↗

PubMed1980

A loading impression technique for semiprecision and precision removable partial dentures.

The rationale of designing a seimprecision or precision distal-extension removable partial denture and the justification of ridge loading in distal-extension ridge impression techniques have been presented. The effectiveness of existing impression techniques in securing firm seats for abutment castings, accurate border extension of the denture base, and loading of the ridge mucosa has been evaluated. A technique has been described that overcomes the limitations of existing impression techniques for semiprecision and precision distal-extension removable partial dentures.

Acrylic Resins↗

PubMed2003

Quality of materials supplied to dental laboratories for the fabrication of cobalt chromium removable partial dentures in Ireland.

The adequacy of prescription for fabrication of cobalt chromium removable partial dentures is often regarded as being less than ideal. This study examines the nature and quality of written instructions and master impression sent to dental laboratories in Ireland for fabrication of cobalt chromium removable partial denture frameworks. Questionnaires were issued to dental laboratories seeking specific information relating to the materials (impression materials and trays) and written instructions supplied, as well as the technicians' opinion regarding the suitability of these materials. One hundred completed questionnaires were returned. One-third of master impressions were made using a plastic stock tray and alginate; technicians felt that one-fifth of master impressions were unsuitable; almost three-fifths of written instructions were inadequate. The quality of clinical information examined was found to be less than adequate.

Alginates↗

PubMed1978

A technique for restoring abutments for removable partial dentures.

A technique was presented to restore a removable partial denture abutment so that the removable denture can continue to be used. The technique uses cold-curing acrylic resin in a rubber base impression form. The technique can be adapted to both direct and indirect procedures.

Acrylic Resins↗

PubMed1988

A four-year clinical evaluation of resin-bonded fixed partial dentures.

A total of 58 resin-bonded fixed partial dentures seated in 47 patients were examined for periods of 2 to 51 months. During the evaluation period, 10 prostheses (17.2%) became dislodged. Six restorations (10.3%) were successfully rebonded and four (6.9%) were remade. Six anterior and four posterior restorations were dislodged. Six mandibular and four maxillary prostheses became debonded. One restoration containing more than one pontic was dislodged.

Acrylic Resins↗

PubMed1989

Laboratory procedures for the one-clasp removable partial denture.

The lateral rotational path of insertion for removable partial dentures in the Kennedy class II category is generally limited to situations where the dentulous side has been restored with fixed restorations that provide a lingual undercut. The rigid lingual plate is first inserted horizontally into the undercut, followed by a lateral rotation to seat the edentulous side. No alterations of properly designed fixed restorations are necessary. This article discusses the technical procedures in detail.

Dental Abutments↗

PubMed1985

A decade of progress for the adhesive fixed partial denture.

The history of the development of adhesive fixed partial dentures was reviewed and present clinical problems discussed. Longitudinal studies are not available because adhesive prostheses with 4-META adhesive resin were introduced only a few years ago. However, scientific advances will make placement of resin-bonded metal prostheses a more stable, standard technique in fixed prosthodontics.

Adhesives↗

PubMed2000

Device for recording the path of insertion for removable partial dentures.

Some negative outcomes of oral rehabilitation using removable partial dentures (RPDs) can be prevented when the framework of the RPD is planned with mounted diagnostic casts that have been analyzed in a dental surveyor. Recording the established path of insertion can be difficult when the procedure uses a pin that is cemented in the cast base, and the casts are mounted in an articulator. This article presents a procedure for a pin device to record the path of insertion of RPDs. This device serves the same purpose as the cemented pin but can be easily removed and replaced.

Dental Articulators↗

PubMed1996

An evaluation of microwave-polymerized resin bases for removable partial dentures.

PURPOSE: The hardness, porosity, and adaptation of removable partial dentures fabricated with one heat-polymerized denture base resin and two resins designed for microwave polymerization were evaluated. MATERIALS AND METHODS: Five prostheses were evaluated for each resin. Adaptation of the denture bases to the master cast was evaluated by spatial orientation and mean weight of residual impression material. The prostheses were than embedded in epoxy resin and sectioned for evaluation of resin hardness (Knoop hardness) and microporosity. RESULTS: There were no significant differences in the adaptation of the acrylic resin bases for Acron MC and Ch Lucitone. There was no significant difference in the mean Knoop hardness values for any of the resin bases near and away from the metal. None of the denture bases showed porosity greater than 100 microns. CONCLUSIONS: Both resin bases formulated for microwave polymerization were effectively polymerized around metal frameworks without adverse effects on resin hardness or porosity. Justi Denture Base material had poorer base adaptation than the other two resins.

Acrylic Resins↗

PubMedDate not supplied

[Convenience of vestibular surfaces of lower canines for accepting retention elements of removable partial denture].

Lower canines often appear as abutment teeth of partially edentulous dental arch. Crown contours of these teeth are mostly inconvenient for placing clasps. The convex vestibular surfaces with sufficient undercuts for placing retention elements are obligatory on lower canines but it is not common case. Aim of this paper was to confirm a high frequency of unexistence of buccomesial and buccodistal undercuts of the lower canines. Measuring of buccomesial and buccodistal undercuts on abutment lower canines was preformed on 50 diagnostic casts of lower jaw, belonging to Kennedy class I, where the canine was a border of shortened dental arch. For this procedure paralelometar Unit "Degussa" with a special measuring device was used. The undercut depth could be read directly within a range of 0-1.0 mm. Results show that unprepared lower canines have poor possibilities for retention removable partial denture with clasps. Our positive clinical experiences in recontouring vestibular surfaces of the abutment teeth point to two methods of making an artificial undercut: non-invasive (making an artificial undercut using composite materials) and invasive (using modified fixed restorations). Considering fact that vestibular surfaces of lower canines as abutment teeth are in most cases without undercuts, recontouring of this surface in almost all occasions is necessary. If vestibular undercuts don't exist, non-invasive techniques should always have advantages to invasive techniques. The vestibular surfaces of abutment teeth might be recontoured by using non-invasive techniques with minimal destruction of integrity of teeth. Lately, the composite materials are used for forming artificial undercut.

Cuspid↗

PubMed1989

[Construction of data base for designing removable partial dentures. 1. Retainer and abutment selection].

In designing removable partial dentures (R.P.D.) for edentulous patients, variety of designs are selected with considering the condition of residual teeth, alveolar ridge, occlusion and other factors. We have been trying to develop the computer consultation system for designing R.P.D. (so called "expert system") to rationalize the processes of R.P.D. design. In developing and expanding this system, the construction and enlargement of the rulebase and database are indispensable. In this report, we analyzed R.P.D. designs in student's clinic ('83-'85), in order to find the logic for design (rulebase) and to construct databases. Following results were obtained. 1) Wire clasps were most frequently used in Kennedy classification I, II in maxilla. Double clasps were mostly used in Kennedy class I, II in mandible. Akers' clasps were mostly used in class III. 2) Canine, first and second premolar were more frequently selected for abutment than other teeth.

Denture Design↗

PubMedDate not supplied

A variation in minor connector design for partial dentures.

Whenever possible, the minor connector of a removable partial denture is located in the interdental embrasure. Recent evidence suggests that gingival attachment loss is more probable on the proximal aspect, thus minor connectors located in embrasures cover susceptible sites. A rationale and design are presented for locating the minor connector on the lingual aspect of the abutment tooth rather than in the interproximal area.

Dental Abutments↗

PubMed1998

Single implant-supported crown used as an abutment for a removable cast partial denture: a case report.

This case report describes the use of a single implant as an abutment for a removable cast partial denture. The patient had only anterior teeth remaining in the mandible. One single-stage implant was placed to be used as an abutment for a cast removable partial denture. The periapical X-ray taken 14 months after initial loading showed no bone loss. Clinically, there was no crown loosening, no pocket depth, nor any implant loosening at 14 months. A long-term multicenter study is advocated to evaluate a greater number of patients over a 3- to 5-year time period to evaluate the success fo implant-supported crowns when they are used as partial denture abutments.

Aged↗