PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “Denture, Partial, Removable”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 271 records · Page 15Linked to original sources
PubMed1990

[Removable partial dentures applied by electric welding and soldering methods].

The joining procedure for uniting metal structures is very important in the dental clinic, and various kinds of metal joining methods have been performed for clinical application. The conventional torch soldering method using a blow torch has been generally adopted. However, it has several clinical problems, especially in the construction of removable partial dentures. The base metal wires made of a chromium-cobalt alloy are subject to changes in their mechanical properties caused by heating, when wrought wire clasps are joined to rests or frameworks. In addition to the flexibility of wrought wire clasps, damage to acrylic resin denture bases and acrylic resin teeth occurs in the repair of removable partial dentures. In this paper, the electric resistance welding and soldering methods were applied to attach wrought wire components to a removable partial denture framework to resolve the problems of the torch soldering method. As a result, it is suggested that these electric resistance welding and soldering methods have the following advantages, as compared with the conventional torch soldering method. 1. When using this electric resistance welding method, it is possible to fix metals temporarily to each other more securely and strongly than the conventional temporary fixation methods using sticky wax or acrylic resin. 2. The electric resistance soldering method does not require any heat insulation or a partition as the torch soldering method does, because the soldered area is only heated partially. 3. In the case of soldering electrically wrought wire clasps to metal structures such as rests and connectors, there is no fear of of overheating a wide area of wires.(ABSTRACT TRUNCATED AT 250 WORDS)

Chromium Alloys↗
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↗
PubMed1993

Radiographic and metallographic evaluation of porosity defects and grain structure of cast chromium cobalt removable partial dentures.

A study was undertaken to determine the defects in the internal microstructure of clasps of cast chromium cobalt removable partial denture frameworks. Ninety cast frameworks were radiographically evaluated for porosity with an industrial radiographic machine. The grain structure of the clasps was analyzed with an optical photomicroscope before and after various heat treatments. The radiographic study showed a large number of internal defects in various parts of removable partial denture frameworks. The grain structure study revealed microporosities randomly distributed within the matrix. Various heat treatments were performed and resulted in no change in the grain structure of the original castings.

Chromium Alloys↗
PubMed1997

Support of removable partial dentures in situations with a unilaterally missing canine and a curved edentulous ridge.

The load and movement of abutments and removable partial dentures were examined in situations with a unilaterally missing canine and a curved edentulous ridge. These measurements were performed on a model adapted to intraoral conditions. In this simulation, removable partial dentures supported by incisors may result in failure. Spring rest support results in significantly reduced articulation vertically and horizontally when compared with solid rest support and avoids periodontal overloading.

Analysis of Variance↗
PubMed1996

Comparison of the in vitro fatigue resistance of an acrylic resin removable partial denture reinforced with continuous glass fibers or metal wires.

PURPOSE: The fatigue resistance of heat-polymerized acrylic resin test specimens reinforced with continuous glass fibers or metal wire was investigated. MATERIALS AND METHODS: Test specimens in the shape of maxillary removable partial dentures were reinforced with one of the following: (1) circular steel wire (cross-sectional diameter, 1.0 mm); (2) semicircular steel wire (cross-sectional diameter, 1.0 x 2.0 mm); or (3) continuous unidirectional E-glass fibers. Ten specimens were fabricated for each test group. The specimens were tested by a constant force flexural fatigue test at a force of 180 N while immersed in 37 degrees C water. The number of loading cycles required to generate a fatigue fracture and the position of the fracture were measured. RESULTS: Results showed that the test specimens, which were either unreinforced or reinforced with metal wires, fractured after 13,197 to 39,237 loading cycles. For the glass fiber-reinforced test specimens, the fracture did not coincide with the region of the strengthener but with the opposite side of the test specimen after 1,239,298 loading cycles. The position of the fracture showed a statistically significant variation between the test groups (P < .001). CONCLUSIONS: This study suggests that the fatigue resistance of acrylic resin removable partial dentures reinforced with glass fibers are superior to those removable partial dentures reinforced with conventional metal wire.

Analysis of Variance↗
PubMed2000

The mandibular first premolar as an abutment for distal-extension removable partial dentures: a modified clasp assembly design.

Sound mandibular first premolars can be used as sole abutments for bilateral distal-extension removable partial dentures, if the denture is designed to minimise the torque applied to the abutment teeth. A simplified modification of the conventional torque-releasing clasp-assembly designs is suggested for these teeth. This modification entails a mesial rest on each abutment tooth connected to the distal proximal plate via a lingual bracing arm. A circumferential clasp arm is optional for buccal retention of the removable partial denture. As with conventional designs, the metal framework is designed to permit some rotational tissueward movement of the distal extension bases, yet not compromise the retention and stability of the prosthesis.

Bicuspid↗
PubMedDate not supplied

Periodontal considerations in removable partial denture treatment: a review of the literature.

PURPOSE: A critical review of the literature on the periodontal considerations in removable partial denture (RPD) treatment is presented. MATERIALS AND METHODS: A MEDLINE search was conducted for studies pertaining to the effects of RPDs on the periodontal tissues during the various phases of prosthetic treatment. The review included both in vivo and in vitro studies. RESULTS: The use of RPDs leads to detrimental qualitative and quantitative changes in plaque. There seems to be a lack of information regarding the effects of RPDs on the status of periodontally compromised abutments. A number of studies, mainly in vitro, have failed to agree on the ideal RPD design. Clinical trials have shown that if basic principles of RPD design are followed (rigid major connectors, simple design, proper base adaptation), periodontal health of the remaining dentition can be maintained. CONCLUSION: Removable partial dentures do not cause any adverse periodontal reactions, provided that preprosthetic periodontal health has been established and maintained with meticulous oral hygiene. Frequent hygiene recalls and prosthetic maintenance are essential tools to achieve a good long-term prognosis. More prospective clinical trials are needed on the effect of RPDs on the condition of periodontally involved abutment teeth.

Dental Abutments↗
PubMed1993

A new device for blockout procedures in rotational path removable partial dentures.

The rationale of a rotation axis is discussed and on this basis a blockout device is designed for rotational path removable partial dentures. This device has three basic components, which are (1) the acrylic resin block, (2) the rotation axis, and (3) the functional part. In the blockout procedures for removable partial dentures with tilted mandibular molars, the rotation axis of the prosthesis is first localized by the blockout device. A knife edge, made of Duralay resin that corresponds to the survey lines of teeth to be used as supports, is constructed and is joined to the functional part of the blockout device. Blockout regions are determined by the rotational movement of the Duralay resin knife edge along the rotation axis of the blockout device. In addition to the function of blockout, the device can also be used to analyze diagnostic casts for critical undercuts. Internal and external types of blockout devices are also discussed.

Acrylic Resins↗
PubMed1990

Other dental treatment needs in patients who requested removable partial dentures.

The aims of this study were to determine the dental and periodontal status and the associated treatment needs, other than that for prosthetic care, in patients who requested removable partial dentures. Forty-six patients who had never worn removable partial dentures before were examined for plaque index, tooth status, gingival index, loss of periodontal attachment and tooth mobility. Prior to prosthetic treatment, 15% of the teeth needed conservative treatment and 1% needed extractions. From the periodontal point of view, 65% of the teeth needed some form of related therapy, and 2% of the teeth were at risk of extraction due to advanced mobility.

Adult↗
PubMed1997

[Determination and analysis of masticatory performance of unilateral free-end removable partial denture].

In this study, the changes of masticatory performance of 30 cases (18 males, 12 females) wearing unilateral free-end removable partial dentures were studied before wearing, 1 week, 1 month and 3 months after wearing by using the light absorption method and peanuts as test food. The results showed: 1. The masticatory performance before wearing unilateral free-end removable partial denture was predominantly lower than that of normal control group. The more teeth lost, the lower unilateral masticatory performance was observed. When the number of lost teeth was few, patients compensated and maintained their masticatory performance before swallowing. 2. The masticatory performance was gradually improved with wearing denture period increasing. 3. Factors relating to the masticatory performance were sex, the extent of alveolar bone resorption and age. Except sex, the extent of alveolar bone resorption and age factors were negative correlative with the masticatory performance; However the number of occlusal units lost, chewing habit and the kinds of denture base materials had no relation to the masticatory performance.

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↗
PubMed1993

On functional strain in some fixed and removable partial dentures. An experimental in vitro study.

An 11-unit fixed maxillary reconstruction with 2 bilateral cantilever pontics in combination with a removable partial denture (RPD) with a palatal bar was fabricated. The RPD was retained to the fixed reconstruction with precision attachments. A laboratory model system was constructed in such a manner that the mechanical properties of the biologic supporting tissues involved were simulated by artificial materials. By means of a strain-gauge technique the deformation was studied in both the fixed and the removable partial denture. In different laboratory loading situations with and without the RPD the deformation in the fixed dental appliance was more extensive and more complex when the RPD was excluded.

Dental Stress Analysis↗
PubMed1992

Load transfer by a maxillary distal-extension removable partial denture with cap and ring extracoronal attachments.

This study photoelastically compared the stress distribution characteristics of maxillary, bilateral, distal-extension removable partial dentures retained by light and heavy ERA extracoronal attachments. One prosthesis included supporting rests and the other had no rests. Both designs were tested with and without abutment splinting. The most favorable stress distributions were obtained with light retention elements, supporting rests, and splinting of the abutments. In this configuration the attachment prosthesis compared favorably in stress distribution with the maxillary I-bar retained removable partial denture in a previous study that used a comparable maxillae model.

Dental Prosthesis Retention↗
PubMed1992

Comparison of vertical movement occurring during loading of distal-extension removable partial denture bases made by three impression techniques.

Although the altered-cast impression technique attains stability and controlled tissue support for distal-extension removable partial dentures, the procedure is time-consuming and technique-sensitive. This study clinically compared the vertical displacement of distal-extension removable partial dentures made from different impression techniques. The impressions studied were the altered-cast impression, an impression made from a border-molded custom tray, and a stock tray irreversible hydrocolloid impression that served as a control. A post hoc analysis, using a Tukey Q-test, exhibited significance (p less than 0.01) between the two impression techniques after intraoral loading was performed. Although statistically significant, the 0.19 mm difference between the impression techniques may or may not be clinically relevant. Additional research is required in this area.

Alginates↗
PubMed2002

Future needs for fixed and removable partial dentures in the United States.

STATEMENT OF PROBLEM: Because of the decline in missing teeth among most adults, prosthodontic advanced training programs are concerned about the need for prosthodontics in the future. PURPOSE: An analysis was conducted to project the unmet need for fixed and removable partial dentures in the years 2005, 2010, and 2020. MATERIAL AND METHODS: Unmet need was calculated as follows: Total need equals the number of persons in each age cohort multiplied by the percentage who need a fixed or removable partial denture multiplied by the average procedure time required to provide the service. Total unmet need then equals total need minus the annual supply of prosthodontic services delivered by prosthodontists and general practitioners. RESULTS: Projected results indicate that total unmet need will increase from 488 million hours in 2005 to 517 million hours in 2010 and to 560 million hours in 2020. CONCLUSION: The significance of the results is that unmet prosthodontic need will increase and exceed the supply of services for the foreseeable 20-year future. Practicing dentists will find that a sizable minority of the population will continue to need fixed and removable partial denture services.

Adult↗
PubMed1989

Removable partial denture design and fabrication survey of the prosthodontic specialist.

In an effort to better understand and define the present standard of practice for removable partial denture design and fabrication, a questionnaire was prepared and distributed to prosthodontic specialists and graduate students or residents attending the American College of Prosthodontists annual meeting in 1987. The survey was designed to determine the philosophies and techniques used by prosthodontic specialists in treatment involving the removable partial denture. There were 195 questionnaires completed and used in determining the results. The results indicate areas of general agreement. Comparison with other data shows areas of controversy, but prosthodontists tend to follow techniques and philosophies similar to what is taught in most U.S. dental schools and what is recommended by the Academy of Denture Prosthetics.

Adult↗
PubMed1997

[Using Nd-YAG laser to desensitize the hypersensitive dentine in preparing the abutment teeth for removable partial dentures prosthesis].

Patients often suffer from sensitivity and pain while preparing the seats of occlusal rests of clasps on abutment teeth with hypersensitive dentine for removable partial dentures prosthesis. Base Nd-YAG laser desensitization effect by making a hard surface layer in the hypersensitive dentine of the abutment teeth, We use this method to treat the teeth before and after occlusal seats of clasps preparation, 20 patients, more than 30 occlusal seats of clasp rests are completed smoothly without any suffering since 1991. All the patients wear their dentures satisfactorily without afterward side effect. After half one year to four years followed observation all the rests adapt to their seats well without marking wear, We believe that the desensitizing effect of Nd-YAG Laser is effective in preparing occlusal seats for removable partial denture prosthesis.

Adult↗