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At least 19 recordsLinked to original sources
PubMed1992

Comparison of bond strength of six soft denture liners to denture base resin.

The bond strength of six commercial soft denture liners was evaluated using a modified tensile test. The soft denture liners investigated were Prolastic, VinaSoft, Flexor, Molloplast-B, Novus, and Super-Soft. The samples were processed according to the manufacturers' instructions to cured denture base resin (polymethyl methacrylate; PMMA). The soft denture liners were 10 x 10 x 3 mm and were processed between two PMMA blocks. The samples were placed in tension until failure. The mode of failure, cohesive or adhesive, was also recorded. The results of this study showed that the bond strength is related to the components of the materials. Prolastic, VinaSoft, and Flexor had the lowest bond strength to cured PMMA and ranged from 9.6 to 11.3 kg/cm2. Super-Soft, Novus, and Molloplast-B demonstrated better bond strengths and ranged from 16.7 to 17.6 kg/cm2. The bond strength of Novus could be improved by using the recommended bonding agent and bonded Novus at 26.1 kg/cm2 had the highest bond strength of all materials tested.

Adhesiveness↗
PubMed1992

Comparison of the physical properties of 11 soft denture liners.

Soft denture liners are an important treatment option for patients who have chronic soreness associated with their prostheses. The objective of this study is to determine the tensile strength, elongation, hardness, tear strength, and tear energy of eight plasticized polymers or copolymers, two silicones, and one polyphosphazene fluoroelastomer. Tests were made on samples that were stored in a humidor for 24 hours before testing. The range of data is as follows: tensile strength, 8 to 85 kg/cm2; percent elongation, 150% to 542%; hardness, 25 to 95 Shore-A units; tear energy, 1.43 x 10(6) to 40.4 x 10(6) ergs/cm2; tear resistance, 2.6 to 26.3 kg/cm. It can be concluded that (1) the data obtained can be useful in characterizing the performance of soft denture liners, (2) there is considerable variability in the physical/mechanical properties of soft denture liners, and (3) the required essential properties for soft denture liners are as yet not known.

Chemical Phenomena↗
PubMed1992

Color stability of long-term soft denture liners.

The use of resilient denture liners in complete denture construction has become increasingly popular for providing comfort for denture wearers. The primary disadvantage of these materials is that the physical and mechanical properties change rapidly with time in a service environment. The purpose of this study is to evaluate the color stability of five commercially available soft denture liners as a function of accelerated aging. Color measurements were made before aging with a colorimeter and data processor. The samples were then weathered for 100 hours in an accelerated aging chamber in the presence of a xenon ultraviolet visible-light source, an intermittent water spray at 110 degrees F, and 90% humidity. After aging, color measurements were made again and color differences (delta E) were calculated. Results were statistically tested with analysis of variance and Scheffé intervals were calculated at 0.96. It was concluded that accelerated aging can be used to evaluate color stability of soft denture liners.

Acrylic Resins↗
PubMed1975

Physical and mechanical properties of nystatin-containing denture liners.

The mechanical and physical effects of the presence of nystatin in three denture liners were investigated. In general, the modified materials were softer, showed greater strain, and demonstrated permanent set under compression for the duration of the tests. However, the degree of change in properties appeared unlikely to lead to reduced clinical performance. The most significant change was a great increase in the equilibrium capacity for water in the case of the modified liners. This may enhance the pharmacologic effectiveness of these liners by encouraging the release of nystatin at the tissue surface. Bacteriologic and clinical studies continue to investigate the possibility that modified semipermanent liners (Coe-Supersoft) may reduce the recurrence of denture stomatitis.

Absorption↗
PubMed1992

Evaluation of radiopaque denture liner.

Radiopacity is needed in polymeric biomaterials to facilitate noninvasive detection. Permanent denture liner material with barium sulfate filler is nearly as radiopaque as aluminum and would be useful in radiographic identification. If 1 mm to 3 mm thicknesses are used, it should be easily observable radiographically.

Barium Sulfate↗
PubMed1992

Bond strength and rupture properties of some soft denture liners.

The bond strength and rupture properties of three soft acrylic liners (Coe-Soft, Coe Super-Soft and Vertex Soft) and two silicone liners (Molloplast-B and Flexibase) were tested immediately after processing and following immersion in water at 37 degrees C for 7 and 90 days. The bond test gave variable results, as some materials partly peeled and then stretched until rupture occurred. After saturation the acrylic liners exhibited an increase in tear resistance, whilst silicone materials deteriorated, in the case of Flexibase to approximately 25% of its original value. Vertex Soft was the exception, as tear resistance decreased as water sorption increased. Scanning electron microscopy revealed indefinite demarcation between soft acrylic resins and hard denture base, which was not altered after saturation in water. On the other hand, the interface between denture base and silicone liners was clearly visible before and after saturation. The results indicated that denture soft liners had variable water sorption values depending on their basic structure, and some properties changed after immersion in water, a finding that is of relevance to prosthodontic practice.

Acrylic Resins↗
PubMed1977

Making complete dentures for research purposes.

A method for construction of complete dentures for research purposes has been described. According to this method, a baseplate is fabricated of hard acrylic resin in combination with resilient denture liner. These dentures can be repeatedly used by interchanging denture teeth of the same mold.

Acrylic Resins↗
PubMed1992

Spacer made from a visible light-cured resin for processing denture soft liners.

When soft lining materials are used in complete dentures it is important to control their thickness and increase the probability of their staying in the denture base. A spacer made of light-curing denture base material makes it possible to do both of these things. The denture base resin is packed against the hard light-cured spacer and can be partially cured. The cured spacer will not flow or be displaced and can be easily removed to allow an even space for packing the soft lining material.

Acrylic Resins↗
PubMed1979

Stabilized record bases for complete dentures.

A step-by-step technique has been described to construct stabilized record bases which allows the dentist to take advantage of undercuts through the use of a resilient denture liner material in the undercut regions. The resilient denture liner material protects the rugae and prevents damage to the casts in the undercut regions during repeated placing and removal from the cast. Shellac denture base material at the posterior limit of the record base permits an easy method of checking the posterior palatal seal. The incorporation of the posterior palatal seal in the record base allows for adequate retention during the recording of the maxillomandibular jaw relation records and try-in procedures. The record bases made by the sprinkle-on technique are preferred to those made using the dough method. The bases are rigid, stable, not easily broken or warped, and fit accurately.

Dental Occlusion↗
PubMedDate not supplied

Polyurethane elastomer as a possible resilient material for denture protheses: a microbiological evaluation.

A polyurethane elastomer was microbiologically evaluated in vitro for its potential use in resilient denture liners. Specimens were immersed in suspensions of ten selected oral microorganisms; this was followed by viable cell counts at intervals during a 16-week period. Results indicated that the polyurethane neither supported the growth of the organisms nor was it degraded.

Candida↗
PubMed1976

The continuing role of the prosthodontist in the treatment of patients with cleft lip and palate.

The prosthodontist can fill a unique position on the cleft-palate team by aggressive participation in every phase of treatment for the developing child. Neonatal prostheses allow for normal feeding and help to direct proper tongue position. Palatal obturation is essential during all growth and tooth development. When orthodontic treatment is necessary and a pharyngeal extension prosthesis is present, obturation can be maintained with flexible denture liners. Each individual situation will allow utilization of an innovative type of prosthesis.

Child↗
PubMed1977

The role of the prosthodontist in secondary management of facial trauma.

Major head and neck trauma affects the midface and intraoral structures in most accident victims. The prosthodontist can provide a much-needed treatment service during the rehabilitation of these persons. Secondary management is a complicated and protracted experience. An interdisciplinary approach with consultations, careful planning, and integrated surgical/prosthodontic management of all phases of treatment can provide the patient with a most satisfactory result.

Denture Bases↗
PubMed1977

Denture stomatitis and methods influencing its cure.

A review of the etiology and pathology of chronic denture stomatitis is presented, and two current methods of treatment have been evaluated. The concept of use of tissue conditioning materials is discussed and has proved to be helpful. The physical condition of the patient and his cooperation during and after treatment were observed to be significant factors in the treatment of chronic denture stomatitis. This study was preliminary in nature. Before more conclusive judgements can be made, standard methods should be developed for quantifying the improvement for patients with chronic denture stomatitis. In a more comprehensive study, steps could be taken to guard against investigator bias.

Denture Liners↗