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At least 19 recordsLinked to original sources
PubMedDate not supplied

[Immediate denture and bar retention denture: two solutions of choice to re-establish function and improve esthetics].

Possibilities given by our technics concerning immediate denture and contra-mucosal retention bar mandibular complete denture, allow, at present time, in five clinical steps, an esthetical improvement and a functional rehabilitation, realizing dental prosthesis with all the standard characteristics of classical removal dentures. Any transitional treatment may be suppressed, temporary prosthesis giving often rise to para-functions and resorptions. Finally, these technics give to the patient perfect conditions for a functional integration of prosthesis, as well on psychological as on physiological point of view.

Dental Impression Technique↗
PubMed1979

Physical-chemical aspects of denture retention and stability: a review of the literature.

The physical-chemical mechanism of retention of dentures is a highly complex one. A review of the literature suggests in addition that retention also is a personal phenomenon under the control of numerous factors. Chief among the factors involved in the retention of a well-adapted denture are the forces related to the wetting of the denture and of the mucosal surfaces and the cohesive or intermolecular characteristics of the saliva. The ill-fitting denture most often results from an increase of variation in the denture-mucosa interspace, probably due to bone resorption rather than to any major changes in the physical-chemical factors.

Atmospheric Pressure↗
PubMed1992

Salivary secretion and denture retention.

Correlations between the retention of complete dentures and flow rates of the palatal and parotid glands were studied in 86 patients. The determination of secretion rates and forces of the forward leverage leading to a dislocation of the dentures showed a narrow correlation between the secretion of palatal glands and the retention of maxillary dentures. The retention of mandibular complete dentures is adversely influenced by the secretion rate of minor salivary glands. However, there is no correlation between the flow rate of parotid saliva and the retention of either denture. In addition, the medicinal stimulation of salivation showed that an increase of mucus secretion induced an improved retention of maxillary complete dentures.

Aged↗
PubMed1975

Physical Factors in Denture Retention.

AAThis investigation was carried out to analyze the physical factors of saliva affecting denture retention. A model of examining denture retention is given by two parallel disks separated by a liquid layer. Metal, polyisobutylene (PIB) and poly (methyl methacrylate)(PMMA) were used instead of a denture and mucous membrane; and glycerol, olive oil and castor oil instead of saliva. The experiments were performed with three disk conditions: (1) Both upper and lower disks of metal, (2) both upper and lower disks of PMMA, (3) upper disk with PIB lining and lower of PMMA soley. A strain gauge was used in the experimental apparatus in order to obtain a measurement of high accuracy. In the experiments, the retentive forces developed in layers of 50 mu tickness were measured and compared with the values calculated from theoretical equations. The results are summarized as follows: (1)Retentive force must be resolved into static adhesive and separating forces, (2) surface tension of liquid may not highly influence the retention, and (3) viscosity of liquid plays an important role when two disks are separated.

Adhesiveness↗
PubMed1991

[The coronoid-maxillary space in denture retention].

The coronoid-maxillary space defines the distal maxillary rims, and it is usually tightened during mouth opening. It has been reported that its adequate filling or its overfilling is helpful in prosthesis retention. There are two types of individual anatomical variations, that can affect the size of this space. In fact, the coronoid process can be vertical or lateral. In the first case, the coronoid-maxillary space is reduced in oral opening, therefore the prosthesis edge must be thin. In the latter case, the space increases or does not vary during mouth opening, therefore the prosthesis must be thicker in order to obtain its adequate retention.

Denture Retention↗
PubMed1992

A modified Kapur scale for evaluating denture retention and stability: methodology study.

This study described a modification of a standard method for evaluating the retention and stability of complete denture prostheses. The upper ranges of the Kapur Scale for retention and stability were expanded to improve the sensitivity of this procedure. The standard and modified Kapur scales were also compared with a model using two denture adhesives that have demonstrated varying efficacies when evaluated by more refined laboratory instrumentation. This study verified that the modified Kapur scale was more capable of discriminating the effectiveness between the two denture adhesives, confirming the elevated sensitivity of the modified scale. This improvement of the Kapur scale could be valuable in conducting clinical efficacy trials of denture adhesives when more advanced methodologies present logistic problems.

Adhesives↗
PubMed1992

Value of guide planes in partial denture retention.

The retention of five nominally identical partial denture casting fitted to a master model was measured on an Instron testing machine in the direction of the guide planes and also at angles inclined to them. It was found that: the maximum retention was considerably reduced when the clasps were removed; the guide planes offered some frictional resistance to displacement, the magnitude being critically dependent on the fit; for frameworks with or without clasps a significant increase (P less than 0.01) in retention occurred when the pull was at 22 degrees but not at 12 degrees to the guide planes, and that there was no statistically significant difference between the retention in the forward and backward directions for either a 12 degrees or a 22 degrees tilt of the dislodging force.

Chromium Alloys↗
PubMedDate not supplied

[Experimental study of removable partial denture retention].

This article describes a series of laboratory experiences about the retentive action of different designs of free end removable partial dentures. It reaffirm the classic concept of the better efficiency of the gingival -occlusal arm clasp than the gingival-occlusal ones, the efficiency and benefits of the rough clasp and the important retention of the posterior action clasp. We find also that the classic concepts of direct and indirect retention can be reformulated, in attention than the odem retainers, such as derived from DPI conception, develops an integral concept of retention and a rational system of fixing derived of the retainer design and the abutment preparation.

Bicuspid↗
PubMed1992

The effect of reducing the number of clasps on removable partial denture retention.

Retention to a master model of 10 nominally identical chrome-cobalt removable partial denture castings with standardized bilateral molar and premolar clasps engaging 0.25 mm (0.01 inch) undercuts and 10 castings with clasps engaging 0.5 mm (0.02 inch) undercuts was measured on an Instron testing machine. The retention of each framework was remeasured as the clasps were removed in one of two sequences. Differences between frameworks, number of clasps, and depth of undercuts were all significant. The order of removal of the clasps was not statistically significant. In a separate experiment the position of the dislodging force was found to be significant. It was concluded that the dislodging force was dependent on (1) the fit of the framework, (2) the depth of the undercut, (3) the number of clasps, and (4) its point of application.

Bicuspid↗