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At least 217 records · Page 12Linked to original sources
PubMed1992

Longitudinal study on torque transmitted from a denture base to abutment tooth of a distal extension removable partial denture with circumferential clasps.

Not only forces but also torque exerted on abutment teeth are important factors for planning the construction of distal extension removable partial dentures. The purpose of this study was to make longitudinal analysis of torque transmitted from denture base to a direct abutment tooth of these dentures with circumferential clasps. The results are summarized as follows: (i) Vertical Max. MT (maximal mean value of torque) was decreased and became constant after one or one and half months of the insertion of new dentures. (ii) Lateral Max. MT in one subject was changed from the lingual direction to the buccal direction while in another subject it was constant. (iii) In the vertical direction, there were no remarkable differences of Max. MT and Ave. T (average value of torque) between subjects. Max. MT was 5-10 x 10(-3) kgm-1 in the downward. Ave. T was 2-3 x 10(-3) kgm ss-1 in the downward and 0.3 x 10(-3) kgm ss-1 in the upward. (iv) In the lateral direction, there were considerable differences of Max. MT and Ave. T between subjects. Max. MT was less than 20 x 10(-3) kgm. Ave. MT was 2-8 x 10(-3) kgm ss-1.

Aged↗
PubMed1993

Longitudinal study on forces transmitted from denture base to retainers of lower distal-extension removable partial dentures with conus crown telescopic system.

The purpose of this study was to perform longitudinal measurement of forces transmitted from the denture base to retainers of lower distal-extension removable partial dentures with a conus crown telescopic system. The experimental denture was embedded with a force-detecting unit which could detect a change in lateral and vertical forces transmitted from denture base to retainers at the same time. Forces were measured during chewing of food on several separate occasions from the insertion of new dentures to about 3 months after. Max.ver (maximal mean value of vertical force) and Max.lat (maximal mean value of lateral force) were calculated from the peak level of all strokes of chewing of food at the minimum of the interocclusal distance. The results are summarized as follows: (i) There were no significant changes of Max.ver and Max.lat; (ii) There were no significant differences of Max.ver between subjects the value of which was about 20 N; (iii) There were significant differences of Max.lat between subjects the value of which was less than 15 N.

Bite Force↗
PubMed1982

Rotational path removable partial denture design.

A detailed description of a rotational path of insertion design for removable partial dentures has been presented. By minimizing the use of conventional clasps, this technique offers some advantages. Rotational path designs may minimize adverse periodontal response to a removable partial denture by reducing plaque accumulation and may be applied in esthetically demanding situations. The design concept involves the use of rigid retentive components that gain access to undercut areas through a rotational path of insertion. These rigid components satisfy the basic requirements of conventional direct retained design.

Denture Design↗
PubMed1998

Sectional impressions for mandibular distal extension removable partial dentures.

STATEMENT OF PROBLEM: Corrected impression procedures provide the best possible support to be gained from an edentulous ridge for a removable partial denture, but they are time-consuming and technique-sensitive. PURPOSE: An experimental mandibular distal extension removable partial denture was used to measure the vertical movement of denture bases during biting. MATERIAL AND METHODS: Five patients participated for whom vertical movement of denture bases was measured by comparing the thickness of plaster interocclusal records made with the denture at rest and under biting pressure. Denture bases were processed on master casts formed from final impressions made in full arch custom trays. Secondly, bases were readapted using sectional relining impressions with the same regular body polysulfide impression material. RESULTS: Statistical analysis of the vertical movement of denture bases during biting at 4 points on the right and left denture bases showed a significant decrease in vertical movement with sectional impression. The reduction was less than a 0.1 mm, a result that questions the routine use of sectional impression for every distal-extension mandibular removable partial denture. CONCLUSION: Supportive form of distal-extension edentulous ridges can be recorded successfully by full arch impressions in custom trays.

Adult↗
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↗
PubMed1991

Porcelain-metal pontics for removable partial dentures.

A custom-made porcelain-fused-to-metal ring pontic for a removable partial denture may be color characterized and glazed by use of familiar procedures. The use of this type of pontic on removable partial dentures has the potential of superior esthetic results when replacing isolated maxillary anterior teeth.

Dental Alloys↗
PubMed2001

A review of 243 errors possible during the fabrication of a removable partial denture: part I.

Everyone who participates in any step of the fabrication of a removable partial denture must share in the success or failure of the restoration. Some seemingly innocuous deviations can be accumulative and cause serious problems, so everyone should review the procedures that they use on a regular basis. Parts I through III of this article present a personal and generic (but by no means comprehensive) list of errors that can occur when a removable partial denture is fabricated. Results that can be attributed to these errors are identified, and a possible solution for each error is described. This information is useful to the entire dental team: the dentist, dental assistant, office manager, and dental technician. The articles also include 18 notes that may be beneficial to personnel in the office and/or in the laboratory.

Alginates↗
PubMed1989

Cast restorations made to existing removable partial dentures.

Procedures for the fabrication of complete cast and ceramometal restorations that support existing removable partial dentures are reviewed. Clinical and laboratory procedures are presented. These techniques allow the patient to continue to function with the existing removable partial denture while the restorations are made.

Acrylic Resins↗
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↗
PubMed1977

Stabilizing a removable partial denture framework on the master cast.

This technique aids the dentist in obtaining stable removable partial dentures. Failure to fill the space between the tissue stops of the retention mesh and the dental cast with cold-cure acrylic resin may result in the distortion and displacement of the removable partial denture framework during processing.

Acrylic Resins↗
PubMed1989

[Clinical evaluations on removability of removable partial dentures].

The following results were obtained from studying the removability of 53 removable partial dentures. 1. All of their retentive forces were less than 2,000 gf. 2. In 5 out of 31 dentures whose retentive forces were graded D2 and less, the wearers could remove the dentures easily without help of their fingers. Out of 22 dentures graded D4 and more, 3 conic dentures were difficult in removal. 3. The wearers were dissatisfied with 3 dentures graded D2 and less, and with 2 conic dentures graded D4. 4. In 12 dentures graded D1, 9 dentures were evaluated to be too loose by the operators. In 12 dentures graded D4 and more, 2 conic dentures were evaluated to be too tight by both the wearers and the operators. 5. All conic dentures complained had 4-degree-tapered conic studs as the retainer. 6. It is considered that in terms of subjective evaluations, an adequate retentive force for the dentures might be in the range from 800 gf to 2,000 gf.

Consumer Behavior↗
PubMed2001

Periodontal findings in patients 10 years after insertion of removable partial dentures.

The purpose of this retrospective study was to evaluate the changes in the periodontal conditions of patients wearing different designs of removable partial dentures over long-term. Seventy-four patients treated with 101 mainly conical crown-retained dentures (CCRDs) or clasp-retained removable partial dentures (RPDs) or a combination of conical crown and clasp-retained dentures (CRPDs) were re-examined 10 years after insertion. Periodontal findings were compared with baseline values at insertion. A deterioration of the probing depths (PDs) and tooth mobility was found. The abutment teeth of the RPDs suffered more severe deterioration than the abutment teeth of the CCRDs and the CRPDs. The absence of a regular recall system for the patients may be responsible for this outcome.

Alveolar Bone Loss↗
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↗
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↗
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↗