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At least 469 records · Page 26Linked to original sources
PubMed2006

Influence of food platform width of mandibular removable partial denture on food mixing ability.

The aim of this study was to clarify the influence of food platform width on food mixing ability in patients with mandibular removable partial dentures (RPDs). Twelve subjects (six males and six females, mean age 56.8 years) with intact dentition except for unilaterally missing mandibular first and second molars participated in the study. The food platforms of their RPDs were made of light polymerized composite and three platform conditions were evaluated. A food platform (Control condition) had 7 mm width with a central focus on the top of the residual ridge. Narrowed platforms (5 mm) were created by trimming a lingual portion (Buccally oriented occlusion, Buccal condition) or a buccal portion (Lingually oriented occlusion, Lingual condition) from the control. Subjects chewed a standardized wax cube which provided an estimate of food mixing ability [Mixing Ability Index (MAI)] for each of the three platforms. A significant effect (P < 0.001) on the MAI was found for food platform type (repeated measures one-way analysis of variance). Tukey multiple comparisons found significant differences of MAI between Control condition (1.05 +/- 0.26) and Buccal condition (0.86 +/- 0.23) (P = 0.032), and between Control and Lingual condition (0.54 +/- 0.37) (P < 0.001). Furthermore, MAI with Lingual condition was significantly smaller than that with Buccal condition (P < 0.001). These results suggest that reduction in the width of the food platform may impair masticatory function and the buccal portion of mandibular food platform of RPD is more critical for food mixing than the lingual portion of the platform.

Composite Resins↗
PubMed1985

The effect of removable partial dentures on mastication and dietary intake.

Masticatory efficiency, the subjective experience of masticatory performance, and dietary intake were evaluated in 19 subjects who were treated with a removable partial denture in the lower jaw. The subjects were tested on three occasions: before treatment, with the dentures when free from symptoms, and about 4 months after the dentures were inserted. Masticatory efficiency and the subjective experience of masticatory performance increased significantly after the subjects were provided with the dentures, but no changes were found in the dietary intake.

Adult↗
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↗
PubMed1995

O-ring coping attachments for removable partial dentures.

Clinical experiences for the past 9 years have demonstrated the practicability of the O-ring coping attachment, a modification of the telescopic crown-and-sleeve coping retainers, for removable partial dentures. A circumferential groove placed in the primary coping receives an elastomeric O-ring that fits into a corresponding groove made in the internal surface of the telescopic crown. The O-ring not only provides controllable retention but also acts as a shock absorber. Long-term retention of the prostheses can be easily maintained by periodic replacements of the O-rings. Sophisticated procedures and expensive machines are not required to make the prostheses. Excellent patient acceptance and the versatility in clinical applications make this system one of the winning designs for removable partial prosthodontics.

Crowns↗
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↗
PubMed1978

Acrylic resin blockout for interim removable partial dentures.

A technique using autopolymerizing acrylic resin as a blockout material has been described. This technique greatly simplifies the laboratory construction and insertion phases of the complex interim removable partial denture. It is not suggested that the acrylic blockout replace the wax blockout if a heat-cured denture base is not indicated. Wax should be used if a "sprinkle-on" autopolymerizing acrylic resin is used for the denture base.

Acrylic Resins↗
PubMed1990

Periodontal conditions following treatment with distally extending cantilever bridges or removable partial dentures in elderly patients. A 5-year study.

The aim of the present study was to evaluate the periodontal conditions following treatment with distally extending cantilever bridges or removable partial dentures (RPDs) in elderly patients. All participants had a complete denture in the maxilla and moderate-to-advanced bone loss around the teeth present in the mandible. After undergoing periodontal treatment, 27 patients were treated with distally extending cantilever bridges and 25 patients with a RPD. During the first 2 years following prosthetic treatment, the patients were recalled twice a year and during the last 3 years once a year for oral prophylaxis and assessment of the periodontal status. The patients treated with a RPD showed higher mean Plaque and Gingival Indexes than the patients treated with cantilever bridges. No change in probing pocket depths was observed in either group, and only a small decrease in radiographic alveolar bone height was revealed. In conclusion, only minor changes in the periodontal conditions were recorded during the 5 years of observation after treatment with cantilever bridges or RPDs.

Aged↗
PubMed1989

[Study on the dynamic behavior of mandibular distal-extension removable partial denture utilizing finite element method. 1. Introduction of two-dimensional non-linear analysis].

Recently there have been a number of studies concerning the dynamic behavior of removable partial denture under the loading, but none of previous studies have dealt with non-linear analysis. The purpose of this study is to demonstrate the usefulness of two-dimensional non-linear analysis. The behavior of abutment teeth and saddle in relation to the distribution of force on the teeth and the supporting tissues are the objects of this analysis. In this study, a comparative analysis between non-linear and linear analysis was performed utilizing finite element method. The results were as follows. 1. A two-dimensional model simulating the behavior of teeth and the supporting tissues in vitro could been made by changing the values of the Young's modulus and Poisson's ratio of the periodontal membranes and the mucosa of edentulous alveolar ridge at two stages. 2. In the conditioned high loading (5 kg), displacement of abutment teeth and saddle in the linear analysis was larger than that of the non-linear analysis. 3. In the conditioned high loading (5 kg), the distribution of the force on the mesial abutments in linear analysis was larger than that of non-linear analysis. The results of this study suggested that the non-linear analysis was desirable in the conditioned masticatory and biting force.

Dental Abutments↗
PubMedDate not supplied

Comparison of deformation by stereophotogrammetry of various kinds of major connectors in maxillary Kennedy Class I removable partial dentures.

PURPOSE: Major connectors must be rigid to perform their functions with maximum efficacy. This study investigated the deformation of four major connectors for maxillary Kennedy Class I removable partial dentures. MATERIALS AND METHODS: The designs were palatal plate, U-shaped plate, palatal strap, and anteroposterior bar. The deformation properties of major connectors were comparatively analyzed by two methods. In the photogrammetric part, a stereometric camera, Avipan-100 glass films, and an analytic apparatus were used. A computerized hydraulic machine was programmed to load the eight test dentures at 4-Hz frequency under a vertical load of 100 kg and a maximum of 300,000 cycles. The fluorescence penetrant liquid inspection test was used to detect the surface microcracks. RESULTS: The anteroposterior bar showed the least deformation. The other connectors, ranked in increasing order for the amount of deformation, were the U-shaped plate, the palatal strap, and the palatal plate. There were no microcracks in the U-shaped plate and the anteroposterior bar designs. CONCLUSION: Anteroposterior bar major connectors showed the least deformation among the maxillary major connector types tested. Microscopic cracks were seen in major connectors showing the highest degree of deformation and located at the depth of the hard palate.

Acrylic Resins↗
PubMed1979

Detection of binding areas on removable partial denture frameworks.

Owing to a multiplicity of errors introduced during impression procedures and fabrication, disclosure of binding areas on the metal framework is an essential part of any removable partial denture service. Disclosure is best accomplished with an indicator that provides a sensitive, thin, even, and opaque coating. The aims of adjustment or relief are to maintain forces along the long axis of abutment teeth and ensure passivity, and in so doing create a more favorable prognosis. Careful consideration and thought must precede any reduction. Experience should contribute greatly in determining the indicated reduction and the accuracy of performing it.

Dental Stress Analysis↗
PubMed1985

Reaction of the anterior abutment of a Kennedy Class II removable partial denture to various clasp arm designs: an in vitro study.

Five clasp arm designs were selected for in vitro testing of the anterior abutment of a Kennedy Class II removable partial denture. The clasps were a circumferential clasp with the cast retentive arm placed at the survey line, a circumferential clasp with a cast retentive arm placed into a mesiofacial undercut of 0.01 inch, a circumferential clasp with a wrought wire retentive arm placed into a mesiofacial undercut of 0.01 inch, a buccal I-bar placed at the greatest facial curvature into a 0.01 inch undercut, and a half T-bar buccal arm placed into a 0.01 inch distofacial undercut. The relative movement of the abutments was recorded by a polygraph on a line from a point of force in the extension and through the rest seat of the anterior abutment, 90 degrees from the first direction, and vertically in the long axis of the abutment. The amount of movement of the abutment tested varied relative to the clasp design and the directions recorded. The cast circumferential arm placed at the survey line consistently showed less movement, and a cast circumferential arm placed into an undercut showed the greatest total movement. The decision to use any of these clasp arm designs should be correlated with other clinical conditions that are present for a specific patient.

Dental Abutments↗
PubMed2006

Why do dentists struggle with removable partial denture design? An assessment of financial and educational issues.

AIM: Published studies in the international dental literature illustrate that the quality of prescription and fabrication of cobalt-chromium removable partial dentures (CCRPDs) by general dental practitioners frequently fail to comply with ethical and legal requirements. The reasons cited for this in the past have broadly related to either financial or educational issues. The aim of this investigation is to determine the effect of financial and educational factors on the quality of CCRPD design and fabrication by general dental practitioners. MATERIALS AND METHODS: This investigation was completed in two parts. (1) A pre-piloted pro-forma was distributed to a number of dental laboratories throughout the UK and Ireland. These sought information relating to the quality of written instructions for CCRPDs received by these laboratories, and details of the remunerative scheme under which they were being provided. Three categories of remunerative scheme were considered, private CCRPDs in Ireland, private CCRPDs in the UK, and CCRPDs being provided by salaried NHS practitioners. (2) A pre-piloted questionnaire was distributed to vocational dental practitioners in the UK and Ireland. This sought information relating to their attitudes, opinions, and educational and clinical experiences of CCRPD design and fabrication. RESULTS: (1) Three hundred completed pro-formas were returned from dental laboratories, 100 of which related to each of the three remunerative schemes. Poor or no written instructions were provided in 47% (n = 47) of CCRPD cases funded privately in the UK, 46% (n = 46) of CCRPD cases funded privately in Ireland, and 50% (n = 50) of CCRPDs being provided by salaried NHS practitioners. (2) One hundred and seven completed questionnaires were returned from vocational trainees. Vocational dental practitioners had completed fewer CCRPDs during VT than in dental school (dental school: median = 4, inter-quartile range = 3 to 5; VT: median = 2, inter-quartile range = 1 to 4). One-fifth of respondents (n = 22) had not completed any CCRPDs during VT. Nine per cent of VT practices (n = 10) had a surveyor on their premises. Only 15% (n = 16) of respondents felt the time they had spent in VT had increased their confidence in the design of CCRPDs. CONCLUSION: Financial factors did not have as significant an effect on the quality of prescription and fabrication of CCRPDs as did educational factors. Serious deficiencies in the teaching of CCRPDs during vocational training were identified.

Attitude of Health Personnel↗
PubMed1999

Stress distribution and abutment tooth mobility of distal-extension removable partial dentures with different retainers: an in vivo study.

Three types of retainers (wrought wire clasp, Aker's cast clasp, and conical crown telescopic retainer) designed for distal-extension removable partial dentures (RPDs) were assessed in two Kennedy class I patients' mouths. The assessment, included the ratio of denture base shearing load and mobility of the terminal abutments when loaded on a free-end RPD occlusal surface. The mean values of denture base shearing ratios of wrought wire clasp, Aker's clasp and conical crown telescope were 60, 42 and 20%, respectively. The abutment mobility of the three types of retainers were all within the 'mobile ability area' except the wrought wire clasp for patient A's right side. The greatest tooth mobility was observed with the wrought wire clasps, followed by Aker's clasp and the conical crown telescopic retainer. From the analysis the following was concluded: (i) different retainers do influence the occlusal load distribution; (ii) the occlusal load distributed to the free-end saddle is closely related to the connecting rigidity of the retainer; (iii) mucosal support has an indispensable role in sharing the occlusal load with various retainers, even the rigid telescopic retainer.

Aged↗
PubMedDate not supplied

Removable partial denture education in U.S. dental schools.

PURPOSE: A survey of U.S. dental schools was conducted in 2001 to determine the curricular structure, techniques, and materials used in predoctoral clinical removable partial denture (RPD) programs. MATERIALS AND METHODS: The questionnaire was mailed to the chairperson of the prosthodontic/restorative departments of 54 U.S. dental schools. Of these, 44 schools returned the completed survey, resulting in a response rate of 82%. RESULTS: Results from this survey show that a large majority of schools are using similar materials in clinical RPDs; for instance, using modeling compound for border molding final impression trays (61%) and using a semi-adjustable articulator for mounting preliminary casts (90%) and final casts (98%). In addition, a large majority of schools are using similar techniques in clinical RPDs, such as border molding the edentulous areas of the final impression tray (80%) and using the altered cast impression technique (59%). A set post-insertion protocol is present for patients who receive partial dentures in the majority of the schools (93%). Only 25% of schools reported incorporating new educational materials such as the use of Portrait artificial teeth at the predoctoral level. Eighteen percent of schools are allowing students to graduate without a set number of RPD clinical requirements as has been traditionally the case. CONCLUSIONS: Predoctoral clinical RPD programs vary from school to school, yet a large percentage of schools agree on many topics.

Curriculum↗
PubMed1997

The precision attachment removable partial denture.

This manuscript attempts to discuss intracoronal and extracoronal precision attachments. A clinical technique is presented which describes the use of intracoronal precision attachments to retain maxillary and mandibular removable partial dentures. Laboratory techniques are also described in this procedure.

Dental Occlusion↗
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↗