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PubMed1989

[Periodontal aspects of removable partial dentures].

Periodontal pre-treatment of patients receiving partial dentures should involve three phases: initial therapy; periodontal surgery; home care. For periodontal surgery and/or prosthodontic treatment using precision materials, e.g. telescope retainers, the API (approximal plaque index) should not exceed 30%. To prevent further loss of gingival attachment due to iatrogenic irritation by the dentures preparation of abutments should consistently the para- or supragingival. In patients with few residual teeth telescope retainers, which can be cemented for definitive fit if indicated, are the treatment of choice.

Dental Abutments↗
PubMed1998

Treatment outcomes with mandibular removable partial dentures: a population-based study of patient satisfaction.

STATEMENT OF PROBLEM: Little is known about the outcomes of treatment with mandibular removable partial dentures provided by dentists in private dental practice. PURPOSE: This study examined 15 aspects of patient satisfaction and explored the factors found to be associated with dissatisfaction. MATERIAL AND METHODS: A questionnaire was mailed to people whose dental insurance claims included CPT Code 5214 within the last 5 years. A composite measure of treatment outcome was created by combining the responses to the 15 satisfaction items, and 10 factors were then tested statistically to determine their relationship to dissatisfaction. RESULTS: A majority of the respondents were satisfied with the prosthesis, but a substantial amount of dissatisfaction existed. Dissatisfaction was greater when there was no previous wearing experience or when there was an opposing maxillary removable partial denture. Respondents under the age of 60 expressed more dissatisfaction than did those over the age of 60, and subjects with lower levels of general health also reported less satisfaction. One third of the respondents believed their prosthesis required adjustment or replacement, and one fourth said the removable partial denture had caused a problem with the natural teeth. CONCLUSION: A majority of survey respondents treated with a mandibular removable partial denture in private dental practice were satisfied with the prosthesis, but a substantial amount of dissatisfaction existed. Dissatisfaction was related to age, health, prior experience with a prosthesis, and the type of opposing dentition.

Denture, Partial, Removable↗
PubMed1989

Microcomputer-aided removable partial denture design.

A microcomputer-based program for the design of removable partial dentures is described that has an interactive user interface to conduct a heuristic search of removable partial denture design data and produces computer-generated design graphics. The program is useful educationally and clinically.

Computers↗
PubMed1989

[Use of endodontically treated teeth in removable partial dentures].

In our study, cases where teeth with excessive crown loss served as abutments, where examined in Kennedy Class II modification 1, that have tooth and tissue support on removable partial dentures which were constructed with the same design. Our study aims to examine, how vertically directed forces are transmitted to the supporting tissues by using photoelastic method. Teeth with case post and core appliances were used as abutments for removable partial dentures. Vertical loading procedure following the construction of removable partial dentures with the same design, revealed distribution of force over dentulous and edentulous ridge areas. When a comparison between endodontically treated and sound abutment teeth, was made, we had the conclusion that teeth with excessive crown loss can successfully serve as abutments for partial dentures, because the results of our finding exhibited no significant difference.

Dental Abutments↗
PubMedDate not supplied

A castable glass-ceramic pontic for the partial veneer fixed partial denture.

A technique is presented for fabricating an esthetic, cast glass-ceramic pontic for the partial veneer-retained fixed partial denture. After the framework is waxed to full contour, the pontic is sectioned from the remainder of the wax pattern and cut back on the occlusal, proximal, and lingual aspects. A cast glass-ceramic pontic is then fabricated. The pontic is returned to the master cast to complete the wax pattern for the type IV gold fixed partial denture superstructure. The pontic is fitted and then luted to the gold framework using an adhesive resin cement. The lost wax technique ensures a pontic with precise, anatomic form that restores proper contours and relationships. Additionally, this esthetic and durable pontic for partial veneer fixed partial dentures encourages conservative tooth preparation and promotes restorative materials that minimize wear of the opposing dentition.

Dental Casting Technique↗
PubMed2004

In vitro fracture resistance of posterior metal-ceramic and all-ceramic inlay-retained resin-bonded fixed partial dentures.

STATEMENT OF PROBLEM: Inlay-retained resin-bonded fixed partial dentures (RBFPDs) are conservative prosthetic restorations; however, their resistance to fracture is not clear. PURPOSE: The purpose of this study was to compare fracture loads of posterior complete coverage metal-ceramic restorations with all-ceramic inlay-retained RBFPDs. MATERIAL AND METHODS: Thirty-two posterior ceramic RBFPD restorations were divided into 4 groups (n=8): (1) Complete metal-ceramic fixed partial dentures (MC-FPDs) fabricated of Ni-Cr-based alloy (Wirolloy) and veneered with a ceramic (IPS d.SIGN) as the control group; (2) inlay-retained metal-ceramic (MC RBFPDs) with the same materials as the control; (3) inlay-retained lithium disilicate (LD) glass-ceramic (IPS Empress 2) RBFPDs; and (4) inlay-retained zirconia-based (Z) ceramic (Cercon) RBFPDs. Control specimens were prepared to receive conventional complete MC-FPDs designed to include a 1.3-mm-circumferential, 90-degree flat shoulder with rounded angles. Inlay-retained RBFPD specimens were prepared with 2-mm occlusal reduction but without bevels at the occlusal or gingival margins. Specimens were loaded and fracture loads (N) measured at fracture with a universal testing machine at a crosshead speed of 1.0 mm/min and 250 kgf load cell. Data were analyzed with 1-way ANOVA and Duncan test (alpha=.001). RESULTS: Fracture loads (mean +/- SD) were greatest for control specimens (1318.43 +/- 211.00 N) and Z-RBFPD (1247.70 +/- 262.51 N) specimens as compared to MC-RBFPD or LD-RBFPD (P < .001). MC-RBFPD exhibited the next highest fracture loads (958.01 +/- 194.29 N), and LD-RBFPD exhibited the significantly lowest values (303.23 +/- 92.54 N) of the materials tested (P < .001). CONCLUSION: Inlay-retained zirconia-based ceramic RBFPDs demonstrated the greatest fracture resistance among all inlay-retained restorations tested.

Ceramics↗
PubMed1994

Multivariate analyses of factors influencing the longevity of fixed partial dentures, retainers, and abutments.

In logistic regression models, variables were studied for possible influence on the longevity of fixed partial dentures, retainers, and abutments. The type of dental material was the most critical variable for change or removal of fixed partial dentures. Cantilever extension indicated no substantial increased risk of change or removal for the fixed partial dentures. The risk of removal for an abutment was influenced by the following variables: endodontic treatment, distal terminal position, placement in the mandible, and advanced marginal bone loss. Several variables were stronger multivariately than bivariately and this indicated that a combination of risk factors may be the most detrimental for the longevity of the restorations.

Adult↗
PubMed1990

[Esthetics and removable partial dentures: a contradiction?].

Although modern developments in dentistry constrict the indication of removable partial dentures, there is still a number of situations in which a partial denture may contribute to the re-establishment of function, esthetics included. Thereto it is a necessity that all parts of the construction are carefully designed, with special attention for color and form. Choice of the artificial teeth (material), the handling of the acrylic and an adequate anchoring are all important factors in reaching an optimal result.

Acrylic Resins↗
PubMed1996

Properties of glass--ceramic materials for fixed partial denture construction.

In order to determine the feasibility of constructing fixed partial dentures using glass-ceramic materials, the flexural strength and marginal fit of three experimental glass ceramic materials, and DICOR as control, were studied. The flexural strength ranged from 105.8 MPa to 129.5 MPa. Ceramic and alumina addition provided significant strength as tested by ANOVA and multiple range tests (P < 0.05). The range for the cemented bridge margins was from 48.9 microns to 80.4 microns. The tested ceramics had no statistically significant differences in margin openings for the same sites (P < 0.05). However, the openings on the mesial side of the premolar abutment and the distal end of the molar abutment of the fixed partial denture did have statistically significant differences (P < 0.01). Appropriate addition of alumina led to an increase in bending strength. The alumina stabilizes and strengthens the glass-ceramic material by incorporation into the silicone network.

Aluminum Oxide↗
PubMed2000

Clinical evaluation of removable partial dentures 10 years after insertion: success rates, hygienic problems, and technical failures.

The aim of this retrospective study was to examine the condition and success rate of various designs of removable partial dentures 10 years after placement. Seventy-four patients treated with 101 mainly conical crown-retained dentures (CCRDs), clasp-retained removable partial dentures (RPDs), or a combination of conical crown and clasp-retained dentures (CRPDs) were reexamined. Prosthetic findings were compared to baseline values at insertion and checked for factors that may affect them. Overall, 36.6% of the prostheses were regarded as successes, 23.8% as partial successes, and 39.6% as failures. Also, only one-third of the prostheses showed neither hygienic problems nor technical failures. The statistical analysis identified no single parameter as significantly affecting the success rate of the partial dentures. Prostheses supported by several abutment teeth had improved success, and RPDs had a higher failure rate (66.7%) than CCRDs (33.3%) and CRPDs (44.8%); however, because of the limited number of RPDs these differences were not statistically significant. Although the prostheses were unsupervised in service, the 60.4% overall success rate of the dentures was somewhat higher than in other studies on precision-retained prostheses.

Chi-Square Distribution↗
PubMed1993

Partial denture prosthodontic procedures employed by practising graduates of the University of the Witwatersrand, Johannesburg.

This study sought answers to the following two questions related to the teaching of partial denture prosthodontics in the Department of Prosthetic Dentistry at the University of the Witwatersrand, Johannesburg (Wits). Firstly, do practising graduates from Wits assiduously apply, or do they perhaps ignore, the concepts, principles, and practices taught to them at undergraduate level? Secondly, is there any merit in providing additional tutorials on partial denture prosthodontics to undergraduate students at Wits? A questionnaire was mailed to dentists who had graduated at Wits between 1979 and 1986. This sample of 302 subjects was divided into two groups: Group I--those who had graduated between 1979 and 1982; Group II--those who had graduated between 1983 and 1986 and had received additional tutorials on partial denture design. The results suggest that a wide gap exists between faculty beliefs about partial denture design and fabrication and the methods used in general dental practice. Moreover, additional tutorials had some effect on the attitudes and practices of the respondents.

Dentists↗
PubMed1995

Clinical performance of resin-retained fixed partial dentures bonded with a chemically active luting cement.

A clinical study was undertaken to review resin-retained fixed partial dentures bonded with a chemically active luting cement during a 4-year period. One hundred thirty-seven fixed partial dentures were reviewed of which five had failed because of a nonbonding failure (esthetics, trauma, fracture) and 47 (36%) had failed after a bonding failure, of which 72% were rebonded. The mean time of failure was 10.9 months (SD 9.8). The failure rate appeared to be affected by position, use of a rubber dam, and the fixed partial denture design, although no one factor reached conventional statistical significance.

Chi-Square Distribution↗
PubMed1990

A provisional and new crown to fit into a clasp of an existing removable partial denture.

A technique that forms an abutment crown to fit into an existing clasp of a removable partial denture by relining an acrylic resin pattern is described. The outer contour of the pattern is made within an irreversible hydrocolloid impression by use of Duralay autopolymerizing acrylic resin applied with precision dispensers. The pattern is formed before tooth preparation and is made approximately 0.4 mm thick. After tooth preparation, the shell pattern is relined with the same autopolymerizing resin and the existing removable partial denture is fitted over it. The gross pattern is trimmed and the margins refined on a die made from an elastomer impression. The refined pattern is cast and finished, avoiding reduction of the contours established. A second crown is similarly formed in tooth-colored autopolymerizing acrylic resin. It serves as a provisional restoration that allows the patient to wear the removable partial denture while the laboratory procedures are performed.

Crowns↗
PubMed1993

An alternate procedure for making a remount cast for a locking type removable partial denture.

This procedure describes the use of silicone impression material to make an index that will correctly position a hinge and latch removable partial denture when a remount cast is being made. This procedure ensures that the partial denture can be retrieved with the index without stressing the retentive components of the partial denture and the remaining dentition. Recovering the remount cast is easier because the latch can be released before the impression index is separated from the cast.

Dental Impression Technique↗
PubMed2002

Internal porosity of cast titanium removable partial dentures: Influence of sprue direction on porosity in circumferential clasps of a clinical framework design.

STATEMENT OF PROBLEM: Although internal porosity is a potential risk factor for clasp fracture, little is known about its frequency in the clasps of titanium removable partial dentures. PURPOSE: This study investigated the influence of the direction of auxiliary sprues on porosity in the circumferential clasps of a pressure-cast titanium removable partial denture. MATERIAL AND METHODS: Wax patterns of a removable partial denture framework were made on 10 identical refractory casts of a Kennedy class II, modification 1, mandibular partially edentulous arch. For the auxiliary sprues directed to the circumferential clasps, 2 designs were used: straight and curved. Casting was performed in a 1-chamber pressure casting machine. Pore number and size were assessed on radiographs of the castings. The data were analyzed with the 2-tailed Student t test (P <.05). Randomly selected specimens were sectioned for morphologic observation of the internal surface of the pores. RESULTS: The number of pores >or=0.5 mm diameter and the total number of pores were significantly lower in the molar lingual arms of the curved sprue group than in the corresponding clasp arms of the straight sprue group (P =.03 and P =.009, respectively). No significant differences between the 2 groups were found for pores of any size in other locations. The pores had smooth internal surfaces. CONCLUSION: Within the limitations of this study, the curved sprue design produced significantly less porosity in the circumferential clasp arms of a cast titanium removable partial denture than the conventional straight design. The results suggest that internal porosity in titanium castings can be controlled through sprue design.

Dental Casting Technique↗
PubMed1979

The measurement of forces transmitted to abutment teeth of removable partial dentures.

Despite the limited number of patients in the study, the following conclusions may be made regarding the magnitude and direction of forces transmitted to abutment teeth of extension-base removable partial dentures. 1. A technique was presented for using strain gauges to determine the magnitude and direction of forces transmitted to abutment teeth of removable partial dentures. 2. There are variations in force magnitude with a patient and between patients from chewing cycle to chewing cycle. 3. The transmitted forces vary when different removable partial denture designs are used. 4. Improving adaptation of the extension bases to the residual ridge is an excellent means for providing maximum support, increasing patient comfort, and decreasing forces to abutment teeth. 5. Extension bases apply mesially directed forces to abutment teeth during mastication. 6. Further research is needed to elucidate the effects of the various philosophies of removable partial denture design.

Alveolar Process↗
PubMed1995

Removable partial denture abutment restoration: a case report illustrating a new direct technique.

The destruction of the crown underlying a partial denture can render useless an otherwise acceptable prosthesis unless some means can be found for building up the tooth under the prosthesis. The aim of this article is to introduce a technique in which light-curing glass-ionomer resin cement is utilized for the direct restoration of removable partial denture abutments. The cavity preparation is completed in the customary manner. The cement is applied en masse and covered with a suitable translucent separating sheet. The denture is reinserted and the restoration is light cured from the perimeter of the abutment. The denture is removed, and, with the aid of a suitable disclosing medium, the restoration is trimmed carefully to avoid reducing the intimate adaptation between the restoration and the removable partial denture. The technique is offered with full acknowledgement that it is a compromised treatment option.

Aged↗