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Results for “Denture, Partial, Removable”

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PubMed2006

[Computer aided design and computer aided manufacture of sacrificial pattern of removable partial denture framework].

OBJECTIVE: To introduce a method applied in computer aided design and computer aided manufacture (CAD-CAM) of removable partial denture framework for rehabilitating edentulous arch of Kennedy Class II and found a basis for this project. METHODS: Point cloud data of dental stone model was obtained by laser scanning. The following processes were made: drawing framework outline on the reconstructed triangle mesh model, picking up and processing its inner side data as the data of tissue surface, shelling it for 3-D model of framework, and transferring the data to rapid prototyping equipment for manufacture. RESULTS: 3-D model of the removable partial denture framework was preliminarily accomplished. The resin framework used as a sacrificial pattern was manufactured with the rapid prototyping equipment. The fit between resin framework and plaster model was good. CONCLUSIONS: This method, as an integrated procedure including data acquisition, 3-D computer modeling and fabrication by rapid prototyping, is feasible to implement CAD-CAM of removable partial denture framework.

Computer-Aided Design↗

PubMed1993

The oral status of elderly removable partial denture wearers.

A random sample of 1019 elderly home dwelling persons participated in this study. There were 809 dentate respondents, 28.6% of whom wore removable partial dentures. They were examined for coronal and root caries, gingival recession, pocket depth and loss of gingival attachment. The removable partial dentures were also evaluated. Abutment teeth were found to be more likely to have caries and periodontal disease than all other teeth. Using a MANOVA statistical procedure, the analysis indicated that the partial denture itself, irrespective of any professionally determined problems with the denture, appears to affect coronal and root caries on the teeth of partial denture wearers. Partial dentures judged to need repair or adjustment were related to periodontal status. The data on adverse effects of partial dentures suggest a need for patient education by the dentist and through public health measures, and good oral self care and regular professional recall for people who wear removable partial dentures.

Black or African American↗

PubMed1984

The removable partial denture as a periodontal prosthesis.

Research has presented evidence to undermine the myth that the removable partial denture contributes to the progression of periodontal disease and is not suitable therapy for the treated periodontal patient. The properly designed removable partial denture for the periodontal patient can contribute to stability of mobile teeth and provide for an intact functional dentition. If the factors of plaque, pocket depth, transmitted forces to teeth, and tissue coverage are controlled by the therapist, it is conceivable that the result will yield long-term results by providing function with decreased expense, contingency for tooth loss, and prevention of full mouth extraction.

Biomechanical Phenomena↗

PubMed1989

Microcomputer-aided removable partial denture design: the next evolution.

A microcomputer-based program for the design of removable partial dentures has applications in dental education and the clinical practice of dentistry. The program requires a Macintosh computer with a minimum configuration of one megabyte of random access memory and a hard disk drive with a HyperCard program. The instructional design uses an interactive, branching user interface to conduct a search of removable partial design data. The screen design is based on a dental laboratory work authorization, with graphic representations of partially edentulous dental arches and textual information that can be browsed in a nonlinear manner by the user. Approximately 160 removable partial denture designs are provided in the program, as well as the ability to modify the drawings and text to reflect various other clinical situations and to print the work authorization for submission to the dental laboratory.

Computer Systems↗

PubMed1981

Comparison of disclosing media used for adjustment of removable partial denture frameworks.

An investigation was conducted to evaluate eight disclosing media for the detection of binding or interference regions on removable partial denture frameworks. The aerosol spray media were judged to be the most acceptable of those tested because they are easy to use and afford minimal waste; they also adhere well to removable partial denture metals and while easily removed, they are not washed away by excess saliva.

Aerosols↗

PubMed1981

A comparative study of the centrifugal and vacuum-pressure techniques of casting removable partial denture frameworks.

A study was undertaken to evaluate two techniques for casting accuracy on removable partial denture frameworks: centrifugal casting and vacuum-pressure casting. A standard metal die with predetermined reference points in a horizontal plane was duplicated in refractory investment. The casts were waxed, and castings of nickel-chrome alloy were fabricated by the two techniques. Both the casts and the castings were measured between the reference points with a measuring microscope. With both casting methods, the differences between the casts and the castings were significant, but no significant differences were found between castings produced by the two techniques. Vertical measurements at three designated points also showed no significant differences between the castings. Our findings indicate that dental laboratories should be able to use the vacuum-pressure method of casting removable partial denture frameworks and achieve accuracy similar to that obtained by the centrifugal method of casting.

Chromium↗

PubMed1977

Caries and periodontal status in patients fitted with removable partial dentures.

A 6-year follow-up study was carried out on 28 patients fitted with removable partial dentures. Prior to the prosthetic treatment all patients were given oral hygiene instruction and periodontal therapy where indicated. The removable partial dentures were carefully planned and designed. During the follow-up period the patients were examined at yearly intervals when remotivation, scalings, conservation and prosthetic adjustments were carried out as required. Patient cooperation was excellent and no significant deterioration of the periodontal status of the remaining teeth could be found. In addition the number of newly registered carious lesions was low. A certain degree of deterioration of occlusion, articulation, stability and clasp retention of the dentures fitted did occur, however.

Adult↗

PubMedDate not supplied

[Computer-assisted design in removable partial dentures. Expert system and software for framework tracing].

Stelligraph, a software program for designing the removable partial denture offers many possibilities in computer assisted technology. The design can be realized on any particular case, based on three different concepts. This software program can also provide on individual, manual and personalized design this offening complete freedom in the conception. This software program is an expert system in removable partial denture by providing the general practitioner with a rational design as well as clinical guidance for oral rehabilitation.

Denture Design↗

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↗

PubMed1990

[Use of silicone template to prepare guide planes for removable partial denture].

Guide planes are used not only for one path of insertion and removal but also to increase both the stability of the denture and resistance to lateral movement; they also protect the abutments from displacement during insertion and removal of the denture. Therefore, it is necessary to give attention to this part of the mouth preparation in the construction of removable partial dentures. Some methods have developed to form exact guide planes. They are the free-hand method, the modeling plastic index, the acrylic index, the laboratory milling technique, and the intraoral parallelism device. However, most of these instruments are either too expensive or too sophisticated to be considered practical for removable partial denture preparations. This article describes a simple and effective method to assure the development of guide planes intraorally as they are planned on the diagnostic cast. The occlusal or incisal surface of the abutment on the prepared stone cast was completely covered with a newly mixed putty type silicone rubber base. The plastic silicone was put against the prepared guide plane on the stone cast and was compressed with a blockout trimmer held on the surveyor before the silicone setting. All of the prepared guide plane was contoured to disclose the marker and to form a ledge. After the silicone setting, the template was removed and trimmed so that soft tissue will not interfere with the intraoral reorientation. As the templates are placed on the abutments intraorally, the abutments bulging out of the template area are obviously discernible and prepared guide planes on the diagnostic cast can be easily and definitely duplicated on the abutments.

Denture, Partial, Removable↗

PubMed2001

[The use of Dental D (polyacetal resin) as an alternative for chrome-cobalt removable partial denture: a case report].

Polyacetal resin (Delrin) is well known material in many medical fields as for artificial heart valves and artificial hip joints. In dentistry the material is known as Dental D, and among its other applications, is used for removable partial dentures. The article presents a cleft lip and palate patient with missing teeth (12 and 22). The patient underwent on operations for closure of the cleft, but even so some sinus tracts from the nasal cavity to the soft and hard palate exist. The patient was rehabilitated 10 years ago with chrome-cobalt removable partial denture, but lately, episodes of swelling and burning sensation were reported. The patient was diagnosed (by the allergy clinic in Hadassah hospital) as allergic to chrome-cobalt. Some optional treatment plans were offered to the patient (fixed, which involved an operation of closing the fistulas, and then a fixed restoration, another option was removable denture with Dental D). The patient chose to be rehabilitated with Dental D removable partial denture, which closes the fistulas and reconstructs the missing teeth. Due to the physical properties of the Dental D, its biocompatibility and the improved esthetics results, the Dental D can be a good alternative for the chrome-cobalt removable partial denture. The esthetic results with the Dental D, as far better than the conventional partial denture.

Chromium Alloys↗

PubMed1985

Etched castings as an adjunct to mouth preparation for removable partial dentures.

Electrochemically etched nonprecious metal castings have been bonded to etched enamel for use in mouth preparation procedures for removable partial denture placement. The castings have been in service and subject to loading by the dentures for 26 to 42 months. To date, bond strengths have been sufficient to support function of both castings and removable partial dentures clinically. None of the castings has failed in its bond. Evidence that the technique may be a valuable adjunct is building in the field of prosthodontics. Use may be far reaching as dentists apply the concept to a wide variety of patient requirements in dental treatment. As more commercial dental laboratories acquire the capability to etch metals, cost should be minimized. Application is not time-consuming. Some steps are technique-sensitive, however, and short cuts are not well tolerated. This is especially true of cementation procedures where moisture or contamination of the field may lead to failure of the bond. It should be noted that each nonprecious metal is different from other metals in its composition, and therefore, results and techniques reported in this study can only be cited for the metal used. In addition, the acid used for etching one alloy may not be effective on another alloy. Finally, it is important that all castings be checked under a binocular microscope to ensure that proper etching did occur. Underetching and overetching both lead to a weakened bond and potential failure.

Acid Etching, Dental↗

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↗

PubMed1994

Removable partial denture design: importance of clinical variables.

A study was conducted to ascertain the influence of clinical variables on removable partial denture design. Dentures were first designed using only the information usually available to technicians, namely, surveyed, articulated study casts. These designs were then modified using information available to the dentist, that is, clinical variables. Of the 208 dentures analysed, 80 (39%) needed modification to 171 components because of patient-related variables. This high number of modifications reinforces the position that removable partial denture design should be instigated and guided by the dentist.

Dental Occlusion, Traumatic↗

PubMed2004

Comparison of cast Ti-Ni alloy clasp retention with conventional removable partial denture clasps.

STATEMENT OF PROBLEM: The elastic property of Ti-Ni alloy may be a desirable property for cast removable partial dentures. However, little is known about the retentive properties of cast Ti-Ni alloy clasps. PURPOSE: This in vitro study investigated the retentive force of various types of clasps during repeated cycles of placement and removal to determine whether Ti-Ni alloy clasps maintain their initial retentive force under varied conditions, including different retentive undercut depths and clasp size (thickness and width). MATERIAL AND METHODS: The test models were developed using a mandibular dentiform with a horizontal plane of occlusion. Two complete metal abutment crowns were made for the left second molar, differing only in retentive undercut depths. A total of 98 clasps (n=7) were fabricated, including 14 wrought wire clasps and 28 clasps from each of the following alloys: Co-Cr alloy (Biosil), Type IV gold alloy (Cast-4), and Ti-Ni alloy (TN-10). Clasps were made to engage one of 2 retentive undercut depths (0.25 mm or 0.75 mm) and were made in 2 sizes (0.8 mm or 1.4 mm). Each clasp was radiographically examined for casting defects and porosity. The force (N) required to remove the clasps was measured using a universal testing machine with a crosshead speed of 10 mm/min. After measuring the retentive force, a masticatory simulator was used to cycle the clasps on and off the metal crown 500 times, simulating the insertion and removal of a removable partial denture clasp. The cycling sequence was repeated 10 times, and retention force was measured after each sequence. The internal surface of the clasp arms was examined for evidence of metal fatigue using scanning electron microscopy. Data were subjected to 2-way and 4-way analysis of variance, followed by Scheffe's multiple comparison test (alpha=.05). RESULTS: Co-Cr alloy and gold alloy clasps in the 0.25-mm retentive undercut groups experienced a gradual decrease in retentive force measurements (P<.001). In contrast, the Ti-Ni alloy clasps maintained a retentive force of approximately 1.8 N and 2.6 N for the 0.8 mm and 1.4 mm clasp groups, respectively. Although Ti-Ni alloy clasps' retentive force was reduced slightly after the first cycling sequence, it was negligible compared with other clasps tested. The wrought wire clasps also retained their retentive force until the final cycling sequence. A similar trend was found in the clasp groups engaging 0.75-mm retentive undercuts. CONCLUSION: Although the end-point retention for all the clasps was similar, there was less change in the retentive force of the cast Ti-Ni alloy clasps after repeated cycling sequences of simulated placement and removal.

Analysis of Variance↗

PubMed1993

Longitudinal study on torque transmitted from denture base to an abutment tooth of lower distal-extension removable partial dentures with conus crown telescopic system.

The purpose of this study was to make a longitudinal analysis of torque transmitted to a direct abutment tooth of a lower distal-extension removable partial dentures constructed with the conus crown telescopic system. Torque around the vertical and lateral axes of the tooth were measured during chewing of food at the time of insertion of the new dentures to about three months after. The maximal mean value of torque (Max.MT) was calculated from the peak level of all chewing strokes at the minimum of the interocclusal distance. The integration values of torque (I) and time (T) from initiation of chewing to swallowing were obtained, then the average value of torque (Ave.T) was calculated (Ave.T = I/T). The results are summarized as follows: (a) There were no remarkable changes of Max.MT around the both axes; (b) Max.MT around the lateral axis was 7-47 x 10(-3) kgm (mean: 25 x 10(-3) kgm) (1 kgm = 9.8 Nm) in the downward direction and Ave.T around the lateral axis was 6-14 x 10(-3) kgm ss-1 (mean: 10 x 10(-3) kgm ss-1) in the downward direction; (c) There were marked differences of Max.MT and Ave.T around the vertical axis between subjects. Max.MT around the vertical axis was less than 24 x 10(-3) kgm and Ave.T around the vertical axis was less than 6 x 10(-3) kgm ss-1.

Aged↗

PubMed1992

The effect of removable partial denture framework design on gingival inflammation: a clinical model.

A clinical trial using the experimental gingivitis model developed for periodontal clinical research was performed to evaluate the effect of a removable partial denture mandibular major connector design on the surrounding gingival tissues. A comparison of the state of health of adjacent gingival tissues was made between the linguoplate (control) and cingulum bar (test) major connectors. Clinical parameters were recorded in a single-blind crossover experimental gingivitis trial. Subjects were brought to a level of optimal gingival health and then randomly assigned to use one framework design while refraining from any oral hygiene. Measurements were made at 7-day intervals for 21 days. The subjects were returned to optimal oral health and repeated the experimental period with the alternate design. Results showed a greater increase in mean gingival inflammation with the control than with the test removable partial denture, suggesting that the cingulum bar has fewer detrimental effects on gingival tissues than the linguoplate major connector. Results of this study suggest that the experimental gingivitis model can be a useful and valid system for studying the potential effects of a removable partial denture design on surrounding oral tissues.

Adult↗

PubMed1983

Chewing patterns before and after treatment with completè maxillary and bilateral distal-extension mandibular removable partial dentures.

Prosthodontic rehabilitation with complete maxillary dentures and mandibular bilateral distal-extension removable partial dentures did not change the general masticatory function to any great extent. However, the velocity of the mandible was increased, especially in the opening phase, and so was the mandibular displacement. The latter seems to be the cause for a long closing duration. The chewing cycle became more even and teardrop shaped, and the prosthodontic rehabilitation also resulted in a decrease of the number of chewing cycles. The Selspot system offers a possibility to study adaptation to prosthodontic treatment objectively by measurements of time and movement.

Adaptation, Physiological↗