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At least 289 records · Page 16Linked to original sources
PubMed1996

A new attachment system for removable partial dentures.

How a removable partial denture (RPD) attaches to its abutment teeth is the most important aspect of partial denture design. The reason is obvious: Many critical requirements for optimal design are dependent on the way the removable segment is related and secured to the abutment teeth. To appreciate the importance of the attachment design, it is necessary to understand several principles of overall RPD design. State-of-the-art RPD design is often the most effective means for achieving long-term maintainable health of the remaining teeth. Even weakened teeth with compromised bone support can, with good design, often be used effectively as abutments for RPDs while benefitting from the removable partial.

Denture Design↗
PubMed1989

[Elucidation of cross arch stabilization for the lower unilateral free end denture in terms of vibratory science].

Cases of lower unilateral free end defect are the source of many problems in clinical dentistry. The denture design method most commonly used is cross arch stabilization which involves creating a retainer on the side opposite the defect via a bar in order to stabilize the denture and protect the retaining teeth. Almost all research on this method involves experiments using a static load. Moreover, there are few studies that attempt to clarify the relationship between the major connector and the retaining teeth. As a means of clarifying these problems, the authors used the modal analysis method and a vibrometer, both of which have proven effective in general observation of lowr denture dynamics when dynamic force is applied. This allowed them to see the relationship between the metal framework configuration and the retainer in animation and thereby study displacement quantity and damping quantity. The following interesting were obtained. 1. There were four modes detected for fixed vibration on the individual metal frameworks: 500Hz band, 1kHz band 2kHz band and 4kHz band. 2. The dynamics of the individual metal frameworks were as follows: Mode 1 was a rigid body mode in a vertical direction with a fulcrum of angle 54. Mode 2 was a horizontal rigid body mode with a fulcrum of angle 54. Mode 3 was a mixture of a horizontal rigid bode and horizontal bend mode. There was a rolling type mode observed only from the plate type. Mode 4 consisted mainly of a horizontal bend mode. This showed that there were differences among the various modes. 3. Judging from the displacement rate computed at the 500Hz band, the rate of displacement decreases as the thickness and ratio decrease. 4. Judging from linear damping quantity and damping quantity in terms of frequency, the finishing line showed a greater tendency toward resonance. 5. Analysis in terms of vibratory science using modal analysis and octave band analysis hinted at the significance of cross arch stabilization.

Dental Stress Analysis↗
PubMedDate not supplied

[The deformation-strain state of bridgework dentures].

Holographic interferometry was used to study strained deformed status of bridge dentures. The technique of measurements with a small holographic system is described. Dentures made of Cr-Ni steel with a principally new method of crown to intermediate part adhesion were under study, as were other bridge denture designs. The findings evidence that holographic interferometry may be used as a sparing method for checking up the quality of casting and adhesion of abutment crowns and an intermediate part of fixed dentures, as well as the strength of adhesion of the facing material (porcelain, plastic) to the metal base of the denture.

Dental Stress Analysis↗
PubMed1981

Swinglock removable partial dentures: where and when.

The where and when of swinglock removable partial denture treatment planning have been presented, including indications, contraindications, and advantages. While the principles asserted in this article do not represent a panacea to partial denture design, the swinglock design concept does provide another treatment alternative for select difficult biomechanic situations.

Dental Abutments↗
PubMed2003

Rotational path of insertion for removable partial dentures with an anterior saddle.

The provision of removable partial dentures remains a viable treatment modality for many partially dentate patients. Replacing missing anterior teeth with a removable partial denture using a rotational path of insertion provides improved retention and appearance. The use of a rotational path of insertion also provides additional retention for a removable partial denture restoring combined anterior and posterior bounded saddles. Two case reports demonstrate the use of the rotational path of insertion for partial denture design.

Bicuspid↗
PubMed1989

A three part sectional denture.

A case is described in which a three-part sectional denture design was used to overcome the problem of severely instanding lower premolar and molar teeth. The design combined the use of a two-part cobalt-chromium lingual plate bolted together by an anterior flange which replaced missing lower anterior teeth.

Denture Design↗
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↗
PubMed2000

Long-term results of telescopic crown retained dentures--a retrospective study.

The clinical data for 250 telescopic crown retained dentures involving 617 abutment teeth preparations were collected and analysed in a retrospective study to ascertain the survival rate of the dentures and their abutment teeth. During the study period 10.6% of the abutment teeth had to be extracted. An increased number of telescopic crowns significantly improved the longevity of the prostheses and their associated abutment teeth in most denture designs, but this was not found to be the case with bilateral free-end saddle designs without an anterior bounded saddle. The use of more than four abutment teeth did not result in a higher survival rate.

Crowns↗
PubMed1993

Clasp retention: the effects of five variables.

An attempt was made to determine the relative retention of each of the four most commonly used clasp assemblies. They are the rest, proximal plate, I bar (RPI); rest, proximal plate, facial circumferential arm (RPA); modified T; and Akers (facial and lingual circumferential arms). A mandibular bilateral distal extension base removable partial denture design was selected because it is most commonly used. A test model was made by removing all mandibular molars from a Columbia Dentoform and replacing the ivorine second bicuspids with natural teeth. These, in turn, were later replaced with gold crowns that were identical in contour to the natural teeth. Eight removable partial dentures were constructed using preformed plastic lingual bars, minor connectors, denture base retention loops, and clasps. Artificial teeth and the denture bases were processed to each framework as for a clinical patient. Each removable partial denture was placed in the Instron testing machine and pulled from the test model. The investigation examined the effectiveness of each of four types of clasps in resisting displacing forces, in both vertical (occlusal) and mesio-occlusal directions. Each clasp was tested using natural teeth and gold crowns, in dry and wet environments, both with and without indirect retainers. Results indicate that, (1) The RPA clasp was the most retentive of all on natural abutments, against both directions of pull, but only slightly so over the RPI clasp with a vertical pull. (2) The Akers clasp was most retentive against a mesio-occlusal pull on the gold abutments. (3) Natural tooth structure gives slightly more frictional resistance than a gold surface.(ABSTRACT TRUNCATED AT 250 WORDS)

Crowns↗
PubMed1990

[Influence on the movement of a complete denture caused by differences in artificial tooth materials].

An experiment using modal analysis was used to ascertain the activity of complete dentures and artificial teeth. Three types of artificial teeth were used: a porcelain tooth, a resin tooth and a hard resin tooth. Animation and displacement values were used as criteria in determining the influence that differences in tooth materials had on the activity of the complete denture. The experiment was conducted to act as an aid in denture design and the following results were obtained: 1. The resonance frequency for the different test materials ranged from mode 4 to mode 7. 2. Regarding displacement value, a value of 1 micron or more was obtained in the 1 octave bandwidth for the 250 Hz band, 500 Hz band and the 1 kHz band. Among these, maximum displacement for the upper complete denture was as follows: When a porcelain tooth was used and a vibration of 1 for mode 1 (197 Hz) was applied, the value for the 3 cusp tip was 39.48 microns and that for the labial denture border side was 43.35 microns. As for the lower complete denture, when a porcelain tooth was used and 5 oscillation was applied for mode 1 (309 Hz), the value for the 3 cusp tip was 68.38 microns and that for the rear part of the denture border was 139.2 microns. 3. Regarding the activity of the complete denture in the 250 Hz and 1 kHz bands, when a porcelain tooth was used, a curve mode was observed for the upper complete denture in the labiolingual direction with the cervical line as the border. When the resin tooth and hard resin tooth were used, it was difficult to recognize any change with the cervical line as the border. It was also difficult to recognize a change at the cervical section for the lower complete denture. 4. As for the 500 Hz band, when a porcelain tooth and a resin tooth were used, there were frequencies (300 Hz-400 Hz) at which twisting in a labiolingual direction at the cervical section was recognized for the upper complete denture as well as frequencies (400 Hz-600 Hz) where this was not recognized. A rigid body mode was recognized when the hard resin tooth was used. In addition, differences in the location for applying for vibration had an influence on the activity of the lower complete denture.

Acrylic Resins↗
PubMed1989

[Study on the dynamic behavior of mandibular distal-extension removable partial denture utilizing finite element method. 2. Influence of the location of rest and displaceability of residual ridge mucosa].

The purpose of this study is to investigate the denture design and displaceability of residual ridge mucosa and its relation to the load distribution on the remaining oral structures. In this study, the effects of the location of rest and displaceability of the mucosa were demonstrated utilizing the two-dimensional non-linear analysis reported on Part 1. The results were as follows. 1. Mesial rest could be simulated on the finite element model using pin element. 2. Removable partial denture with mesial rest distributed more stress on the mesial abutment teeth than that with distal rest. 3. Lesser displaceability of residual ridge mucosa resulted in a decrease of stress concentration around the most distal abutment and the uniform stress distribution on residual ridge was increased. 4. In the simulated condition where an increased pressure was applied on the mucosa, the behavior of the saddle on the mucosa with large displaceability could be similar to that of the mucosa with small displaceability. The results of this study suggested that mesial rest on the most distal abutment and pressure impression was desirable in removable partial denture with distal-extension.

Alveolar Process↗
PubMed1995

The modified swing-lock: a new approach.

The swing-lock removable partial denture (RPD) can address some specific partially edentulous situations better than conventional partial denture designs. The concept is recommended for maximizing stability and retention by access to more tooth surfaces and undercuts with the unique clasping mechanism offered by the incorporation of lock, hinge, and gate assemblies. Since its introduction, the swing-lock RPD has gained some degree of acceptance. However, it is infrequently used by clinicians because it is technique-sensitive, especially during hinge and lock fabrication, and the durability of the retentive element of the locking mechanism decreases with the progressive wear of the metal latch attachment. This article presents a new design for a swing-lock RPD by use of a vertical bar and plastic clip attachment as an alternative to the hinge and latch attachment. The suggested modification in the locking mechanism may overcome some of the problems associated with the conventional swing-lock RPD.

Dental Clasps↗
PubMed1984

Retention of complete maxillary dentures measured as resistance against unilateral occlusal loading.

Complete maxillary dentures were tested for their ability to remain in place when subjected to unilateral occlusal loads. The test material comprised five persons, each supplied with three identical dentures. The denture design was based on the principles of 1) functionally determined filling-in of the vestibular sulcus, 2) palatal coverage to the vibration line without post dam, 3) aesthetically governed positioning of the front teeth, and 4) positioning of the lateral teeth in the plane connecting the top of the residual ridge with the central part of the occlusal surface of the antagonizing natural teeth. Resistance to unilateral occlusal loads was measured by means of a miniature bite force sensor. In the pooled material, an average load of 70 N was tolerated before the dentures were dislodged. For a given participant/denture combination, the resistance against dislodgment varied considerably when tested on different days. Marked differences were also found among three identical dentures in one person. The tolerance against unilateral occlusal loads could feasibly be quantified. However, the influence of specific clinical and/or technological factors on denture retention during function should be studied only if strict definitions as to the test conditions are given. These conditions must include the time, person, and denture tested.

Aged↗
PubMed1989

Photoelastic analysis and comparison of force-transmission characteristics of intracoronal attachments with clasp distal-extension removable partial dentures.

This investigation photoelastically compared the load-transfer characteristics of various bilateral distal-extension removable partial denture designs embodying intracoronal attachments and clasp assemblies. Six distal-extension designs that included the RPI clasp assembly, cast circumferential clasp, P.D. locking semiprecision, Thompson dowel nonlocking semiprecision, and McCollum and Stern G/L precision attachments were tested. Each prosthesis was subjected to various simulated occlusal loads. Evaluation of the load-transfer characteristics of the various designs was based on comparison of the recorded isochromatic fringe distributions. The RPI clasp assembly generated the most uniform stresses. In general, the four intracoronal retainer frameworks produced higher stresses than did the two clasp frameworks. The highest stresses were developed by the Stern G/L precision attachment.

Bicuspid↗
PubMedDate not supplied

Computer-aided learning in prosthodontics.

Interactive video is computer-aided learning illustrated by still or moving video pictures. First introduced for the study of pathology, its application and potential in prosthodontics is reported in this article. Partial denture design was chosen as the first subject, since the systematic approach concept could easily be established by dividing the subject into five units that could individually be expanded and tested. Students are generally enthusiastic about computer-aided learning and there is considerable potential to further develop this type of learning process.

Audiovisual Aids↗
PubMed1993

A zinc phosphate cement-luted and resin-luted fixed partial denture: a case report.

An innovative fixed partial denture design for restoring a posterior edentulous space is described. The distal retainer is conventionally luted with a zinc phosphate cement, and the mesial retainer is luted with a resin cement. Contingency planning, which involves placement of a nonrigid connector between the pontic and the distal retainer, allows recementation of the resin-luted segment if the resin bond fails.

Adult↗
PubMed1990

[Functional prosthetic treatment for the partially edentulous with osseointegrated implants].

The edentulous distal extension area has generally been restored with a removable partial denture. Some clinicians report long term success with a fixed partial denture containing distal cantilever pontic(s). Conversely, other clinicians find that the aforementioned is suspect at best due to the unusual stress demands placed on the abutment teeth by the pontic(s). When a tooth borne fixed partial denture is used to restore a long edentulous span, reports vary relative to long term success. The advent of osseointegrated implants as tooth substitutes may reduce and often eliminate particular compromised fixed or removable partial denture designs. Disregarding other problems that may or may not coexist with any remaining natural teeth in the same arch is a fallacious overview. It is paramount that future problems must be incorporated in any and all treatment plans at the same time the initial plan is formulated. Recent surveys reveal that a fewer percent of the population are becoming completely edentulous. Therefore, it is apparent that an increase in the treatment of the partially edentulous implant patient is a realistic consideration for all restorative dentists. However, it is ironic that those patients with the most severely debilitated conditions may often not be candidates for implant procedures. It is mandatory that a detailed explanation of any compromises and drawbacks to the final result must accompany the initial diagnostic presentation to the patient. It is quite evident that the dentist is confronted with a paradox that is difficult to resolve.(ABSTRACT TRUNCATED AT 250 WORDS)

Dental Implantation, Endosseous↗