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At least 451 records · Page 25Linked to original sources
PubMed1993

Maxillary distal-extension removable partial denture abutments with reduced periodontal support.

An in vitro study that used photoelastic models compared stress distribution characteristics of three maxillary, bilateral, distal-extension removable partial denture designs when the abutments were subjected to a progressive loss of periodontal support. One design used I-bar retention, a second design used a semiprecision, spring-loaded plunger attachment, and a third design used the ERA attachment. Both attachment designs were tested with and without splinted abutments. The ERA design was also tested with and without supporting rests and included light and heavy retention elements. Periodontal support loss up to 35%, a 60/40 crown-to-root ratio, resulted in increased stress concentrations. The ERA design with supporting rests, light retention elements, and splinted abutments compared very favorably with the I-bar retained design on nonsplinted abutments.

Alveolar Bone Loss↗
PubMed1999

A technique to create appropriate abutment tooth contours for removable partial dentures.

A technique is presented for using light-cured composite resin to create desirable contours on abutment teeth for the retention and support of removable partial dentures. The desired tooth shape is created on a diagnostic cast, captured in a clear temporary splint material, and formed in resin on the abutment teeth with the splint acting as a matrix.

Composite Resins↗
PubMed2001

An 8-year follow-up of removable partial denture treatment performed by the Public Dental Health Service in a Swedish county.

The aim of the present study was to evaluate clasp-retained removable partial dentures (RPDs) made in the Public Dental Health Service (PDHS) in Orebro County in 1989. Records from all 25 PDHS clinics concerning RPDs from 1989 were collected after eight years and available information was registered. The entire material consisted of 447 RPDs (both attachment-retained and clasp-retained RPDs) in 387 patients. Of the 316 clasp-retained RPDs that were traceable, 208 were followed from 1989 to 1997. In most instances, information on diagnoses, alternative treatments and design of the RPDs was lacking. One hundred and thirty-two (42%) of the 316 clasp-retained RPDs were judged to still be in use in 1997 while 75 were not in use. The main reason for ceased use was dislike by the patient. There were 108 clasp-retained RPDs that were not possible to follow from 1989 to 1997 because there were no notes regarding follow-ups in the records. The most common technical complications noted in the records during the observation period were clasp fractures and loosened artificial teeth.

Dental Clasps↗
PubMedDate not supplied

Clinical examination and interleukin-1beta levels in gingival crevicular fluid in patients treated with removable partial dentures.

PURPOSE: The purposes of this study were to investigate the periodontal status and susceptibility to periodontal disease progression of the teeth in contact with removable partial dentures (RPD) and to compare them with control teeth in mouths not restored with a partial denture, by means of both clinical parameters and interleukin (IL)-1beta levels in gingival crevicular fluid. MATERIALS AND METHODS: Twenty-eight periodontally healthy patients were selected for the study; 14 of them were treated with mandibular Kennedy Class I RPDs, and the other 14 patients were not restored for control. Clinical periodontal measurements were assessed, and crevicular fluid samples were collected from both abutment and control teeth to determine IL-1beta levels, which were measured by enzyme-linked immunosorbent assay. These procedures were performed both at baseline and 9 months after the insertion of the dentures. RESULTS: The wearing of RPDs resulted in statistically higher clinical scores and total IL-1beta levels compared to the baseline examination. In contrast, no statistically significant differences were found between baseline and 9-month examinations in the control group. CONCLUSION: RPDs are a risk factor for periodontal disease progression because of increased plaque accumulation associated with increased total IL-1beta levels and impaired clinical periodontal parameters.

Dental Abutments↗
PubMedDate not supplied

Review of attachments for removable partial denture design: 1. Classification and selection.

An attachment is a mechanical device, other than a clasp assembly, that functions as a direct retainer. Attachments for removable partial denture treatment are reviewed and a method for classifying different types of attachments is provided. Attachments are categorized as precision or semiprecision, depending upon the method of manufacture; internal or external, according to their intracoronal or extracoronal location relative to the abutment tooth; and rigid or resilient, as determined by the amount of movement allowed between the component parts. They are also classified by design. The advantages and disadvantages of attachment use as well as indications and contraindications are considered. Additionally, the conventional clasp-type direct retainer is compared to attachments.

Dental Abutments↗
PubMed1993

Computerized design of removable partial dentures: a knowledge-based system for the future.

Dentists frequently fail to provide dental technicians with the design information necessary for the construction of removable partial dentures. The computerization of dental practices and the development of appropriate knowledge-based systems could provide a powerful tool for improving this aspect of dental care. This article describes one such system currently under development which is an example of the kind of additional facility that will become available for those practices with the necessary hardware.

Artificial Intelligence↗
PubMed1979

Qualitative changes in dental plaque formation related to removable partial dentures.

A study was performed on the microbial composition of dental plaque developing on fifteen abutment teeth in nine partially edentulous subjects. Bacteria were counted in samples of plaque which had formed on vestibular surfaces, and on proximal surfaces facing edentulous spaces, during a period when dentures were not worn, and then for a period when dentures were being worn. It was found that the presence of removable partial dentures favoured a proliferation of spiral organisms.

Adult↗
PubMed2003

Preclinical removable partial dentures curriculum survey.

PURPOSE: In 2001, a survey of U.S. dental schools was conducted to determine the curricular structure, teaching philosophies, and techniques used in preclinical removable partial denture (RPD) courses and to also establish what newer educational techniques and materials are currently being used by U.S. dental schools. MATERIALS AND METHODS: The questionnaire was mailed to the chairpersons of the prosthodontic/restorative departments of 54 U.S. dental schools. Of these, 43 schools returned the completed survey, resulting in a response rate of 80%. The mean, median, and range of responses were computed where applicable. RESULTS: Results from this survey show that the mean student-to-faculty ratio in the preclinical RPD course was 12:1, with a median of 10:1 and a range of 6:1 to 27:1. The mean number of laboratory hours was 55, with a median of 50 and a range of 13.5 to 120. The mean number of lecture hours reported was 21, with a median of 20.5 and a range 10 to 60. The mean number of practical examinations was 2, with a median of 3 and a range of 0 to 8. The mean number of written examinations given was 2, with a median of 2 and a range of 1 to 6. Ninety-five percent of the schools have prosthodontists teaching this course. The mean number of months that this course is taught is 4.4 months, with a median of 4 and a range of 1.5 to 10. Fifty-five percent of the schools used the Hanau semiadjustable articulator. One hundred percent of the schools teach students to use a surveyor when designing an RPD, and 84% percent of the schools teach the Krol or the Kratochvil RPI design or a combination of the 2 designs. CONCLUSIONS: Preclinical RPD educational programs vary from school to school, yet a large percentage of schools agree on certain topics. Only 19% of dental schools are incorporating new technologies, such as the use of the internet, in their preclinical RPD curriculum.

Curriculum↗
PubMed1993

Longitudinal study on occlusal force distribution in lower distal-extension removable partial dentures with conus crown telescopic system.

The purpose of this study was to examine longitudinal changes of the occlusal force distribution in lower distal-extension removable partial dentures with the conus crown telescopic system. Occlusal force applied to the denture and forces transmitted to the retainers were measured on several separate occasions from the insertion of new dentures to about 3 months after. The occlusal force distribution ratio to the retainers was calculated when a load of 20 N was applied to the denture. The results are summarized as follows: (i) The more posterior the loading point of occlusal force, the smaller was the ratio. When the occlusal force was applied to the most anterior artificial tooth, the ratio was 65-100% of the occlusal force. (ii) As the denture wearing time proceeded, the ratio was decreased. The smaller the ratio, the greater was the rate of its decrease.

Aged↗
PubMedDate not supplied

Removable partial denture design: a need to focus on hygienic principles?

PURPOSE: The purpose of this study was to critically analyze important hygienic/secondary prophylactic and biomechanical aspects of removable partial denture (RPD) design. MATERIALS AND METHODS: The literature related to traditional biomechanical design and open/hygienic design of RPDs was discussed by the authors at a 2.5-day workshop. The written report was circulated among the authors until a consensus was reached. RESULTS: There is little scientific support for most of the traditional design principles of RPDs, nor has patient satisfaction shown any correlation with design factors. However, there is evidence that an open/hygienic design is more important than biomechanical aspects for long-term oral health. The biomechanical importance of some components is questioned, e.g., indirect retention and guiding planes. Alternative connector designs that reduce risks of tissue injury are described. Direct retainers and pontics are discussed in relation to the possibilities they offer for gingival relief. CONCLUSION: Greater attention should be paid to RPD design principles that minimize the risks of tissue injury and plaque accumulation in accordance with modern concepts of preventive dentistry.

Biomechanical Phenomena↗
PubMedDate not supplied

Simultaneous repair and rebase of a removable partial denture.

A patient presented a unique dental problem: the evulsion of mandibular canines, and the restoration of anterior alveolar bone associated with periodontal disease. A mandibular removable partial denture, bilaterally supported by the canines, premolars, and molar abutments of blade implants, had been worn for more than ten years. The open clasps in the canine areas were irritating the oral tissues, and the space under the anterior saddle of the denture was retaining food. Both situations needed immediate consideration. The evulsed canines were reproduced in autocured acrylic and secured in the clasps of the denture. The space under the saddle was rebased with autocured acrylic. Since both areas were adjacent to each other, they were splinted together simultaneously. The patient was satisfied with having the old denture repaired without being deprived of the prosthesis for an extended period of time.

Denture Rebasing↗
PubMedDate not supplied

Cobalt-chromium-titanium alloy for removable partial dentures.

Pure elemental titanium was alloyed with cobalt and chromium in dilutions of 4%, 5%, and 6% to evaluate the suitability of the resulting alloy for removable partial denture frameworks. The physical properties of the Co-Cr-Ti alloy were compared to the properties of a commercial pure titanium and Vitallium. Clasp replicas were cast in Co-Cr-Ti and Vitallium and subjected to cyclic deflection. Representative specimens from the fatigue failure tests were then evaluated using scanning electron microscopy and analyzed for elemental content. The 5% titanium dilution of cobalt-chromium proved to have the best physical properties and was used for comparison with the pure titanium and Vitallium. The Co-Cr-5% Ti had significantly better physical properties than pure titanium and a greater flexure fatigue limit than the Vitallium alloy.

Chromium Alloys↗
PubMed1990

[Plaque reduction in patients with removable partial dentures and abutment teeth with greatly reduced periodontium].

The presented investigation was carried out on 19 individuals who were referred for prothetic and periodontal treatment. All patients suffered from advanced periodontal disease and had no more than 3 teeth left in the jaw going to be treated. Following a baseline examination comprising assessment of oral hygiene and tooth mobility the patients were subjected to prothetic and periodontal treatment. Removable partial dentures were constructed using the conical crown system. The patients were distributed into 2 different maintenance groups. 10 patients (group 1) were instructed to use the Bass Technique for cleaning the remaining abutment teeth. Group 2 applied proximal brushes for cleaning the interdental spaces prior to removing the partial dentures for cleaning as prescribed for group 1. Three months after treatment a reexamination was performed. In both groups a significant reduction of plaque was observed. The plaque scores of the second group were below those of the first group but the difference was statistically not significant.

Aged↗
PubMed1997

Patient swallows removable partial denture: a clinical report.

The indications for a unilateral partial denture would appear to be when there is a single posterior tooth missing, bound on both sides by usable abutments. Another consideration for a unilateral partial denture is that the patient does not want to restore the space with a fixed partial denture. One drawback to this treatment modality is that the prosthesis needs to be removed after each meal and cleaned. Other more important reasons for not making a 1-tooth removable partial denture is that it provides no cross-arch stabilization and there is the chance that it may be swallowed if it becomes dislodged. This clinical and laboratory report describes how this patient was treated.

Deglutition↗
PubMedDate not supplied

Clinical longevity of removable partial dentures retained by telescopic crowns: outcome of the double crown with clearance fit.

PURPOSE: It was the aim of this study to investigate the long-term success of a telescopic crown system that can be used for both rigid and resilient support and to evaluate by means of a literature review whether the use of resilient support may be advantageous compared to other double crown systems when the restoration is placed on only a few remaining teeth. MATERIALS AND METHODS: Patient records were used to evaluate 125 dentures (with 460 abutment teeth) based on the Marburg double crown system. The loss of abutment teeth, endodontic treatment, and fracture of the metallic framework were investigated with regard to the different types of denture support. RESULTS: The probability that a patient would have kept all abutment teeth was 84% after 5 years and 66% after 10 years. No significant differences were found for the two groups "resilient support" (< or = three abutment teeth) and "rigid support" (> or = four abutment teeth). For abutment teeth with a double crown with clearance fit, the risk of loss was 4% after 5 years and 15% after 10 years for rigid support, and 10% and 24%, respectively, for resilient support. The risk of endodontic treatment was 7% after 5 years and 9% after 10 years for rigid support, and 3% and 7%, respectively, for resilient support. None of the denture frameworks showed a fracture during the observation period. CONCLUSION: Removable partial dentures retained by double crowns with clearance fit and constructed without major or minor connectors provide good clinical longevity. The survival rates of abutment teeth were comparable to those reported in the literature for other double crown systems. There was no significant increase of the risk of abutment loss when the restoration was placed on three or fewer remaining teeth and the concept of resilient support was applied.

Adolescent↗
PubMedDate not supplied

Displacement of mandibular removable partial denture bases by tongue movements during speech.

PURPOSE: The purpose of this study was to evaluate denture base displacement caused by tongue movements during speech. MATERIALS AND METHODS: Ten patients with new Kennedy Class I mandibular removable partial dentures participated in this study. All prostheses were made according to a standardized protocol. Denture base displacements when speaking a test sentence were measured with a computer-aided device that was developed for this purpose. It included 4 Hall sensors, mounted on a paraocclusal splint and magnets, embedded in the denture bases. Vertical and transverse base displacements were calculated from Hall voltages. Clasp retention was measured with a dynamometer. RESULTS: Mean displacements were 145 microns seating, 72 microns unseating, 87 microns buccally, and 74 microns lingually. Seating and unseating displacements differed statistically significantly in absolute values. Mean clasp retention was 2.5 N. No correlation was found between clasp retention and unseating base displacements. CONCLUSION: Tongue movements during speech induced only minimal displacements in the dentures investigated. Additionally, tongue activity was found to be denture stabilizing rather than denture displacing in this study.

Adult↗