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At least 325 records · Page 18Linked to original sources
PubMed1993

[Determining factors for retention of complete dentures].

Patients with full dentures often experience some problems with their dentures, one of them is retention. The retention of a full denture is a result of many factors. Some factors are of a physical nature, others of a physiological nature. The dentist has to take these factors into account while modelling the borders, flanks and basis of the prosthesis. In obtaining the best shape of these borders, flanks and basis a special emphasis is put on the border and flank modelling and the individual impression.

Denture, Complete↗
PubMed1983

Technique for the repair of removable partial denture backings.

An easy and practical technique has been described for replacement of a removable partial denture retentive pin as an alternative to fabricating a new removable partial denture or reprocessing the acrylic resin part of the old metal framework. The technique uses the Hydroflame II soldering unit, which provides controlled, localized application of heat without damaging any acrylic resin that may be present.

Acrylic Resins↗
PubMed1991

A comparative study of mastication between complete denture wearers and dentate subjects.

A computer system was used for simultaneously collecting and processing mandibular movements and the myoelectric activities of the masticatory muscles of 15 dentate subjects and 11 complete denture wearers. The displacement, velocity, cycle of mandibular movements, and the muscular mean potentials were indices in observing mastication. A good complete denture should perform with physiologic characteristics, and restore masticatory function and oral health. The kinetic energy from the velocities of lateral and vertical directions can serve for the chewing and comminution of food, but lateral comminution may affect denture retention. The mean myoelectrical potentials of the mandibular elevator muscles of complete denture wearers tend to increase at the opening phase; however, the potentials decrease at the closing phase.

Adult↗
PubMed1990

[An electromyographic observation of the extensional labiobuccal flange lower complete denture].

The electromyogram of the buccinator and the myoid muscles in 26 lower full denture patients with severe atrophic alveoli were measured separately in three groups: group one, the conventional dentures: group two, the extension flange dentures in preliminary stage after the denture insertion and group three, the extensional flange denture in forward stage. The main results showed that (1) the functional force, except on mouth opening, exerted by the buccinator muscles increased significantly in group two and three. (2) the functional force exerted by the mylohyoid muscles on mouth opening decreased significantly in group two and increased in group three which was similar to group one. There were no significant difference between these three groups on swallowing. (3) the functional force except on mouth opening, exerted by the buccinator and mylohyoid muscles between these three groups was no significant difference. These observations indicated that there was no significant interference in the physiological activities of the buccinator and the mylohyoid muscles with the extensional flange dentures. In addition, the extensional buccal flange may enhance the denture retention.

Aged↗
PubMed1982

Analysis of the posterior palatal seal and the palatal form as related to the retention of complete dentures.

Dislodging forces were applied at three different locations--anterior, posterior, middle--on acrylic resin bases of uniform thickness. The influence of different posterior palatal seals and the form of the palate were evaluated. A Pearson statistical correlation analysis was performed to correlate these factors. The findings were as follows: 1. The anterior attachment needed for greatest amount of force to dislodge the base; the posterior attachment needed the least. 2. The middle attachment showed more variability of the forces needed to dislodge the bases. It was influenced by the form of the palate, the type of posterior palatal seal, and the weight of the bases. 3. The middle location is the most reliable region for testing the retention of complete dentures. 4. The form of the palate has direct influence on the retention of complete dentures and will aid in the selection of the type of posterior palatal seal needed.

Denture Bases↗
PubMed1992

Retention for a removable partial denture.

This article addresses the complex nature of retention in a removable partial denture. Retentive features range from magnets and springs to clips, clasps, and interfacial surface tension. The retentive quality of an extracoronal clasp varies with the alloy, physical form, location on the abutment, and positional relationship to other elements. Surveying to identify both occlusogingival and mesiodistal undercuts when the path of random dislodging forces are not definitely controlled is needed for effective retention. Augmentation of ineffective retention in existing clasps should concentrate on methods of deepening the undercut or increasing the suprabulge. Tightening of clasps already in contact with a tooth frequently produces adverse changes.

Dental Abutments↗
PubMed1996

[Mandibular ridge augmentation with hydroxylapatite and its extension].

The results of 5 years follow-up of 84 cases of mandibular residual ridge augmented with hydroxlapatite (HA), followed by ridge extension, are reported. The first surgical procedures, subperiosteal HA insertion, and the second stage of total lowering of the floow of the mouth, vestibuloplasty and skin graft are detailedly described. The ridge is augmented by the first surgery, disturbance of the fraenums of the lip, buccal and tongue and muscles are eliminated by the second surgery, to increase denture retention and stability, improve wear resisting of tissue covered over the artifical ridge and eliminate pain and uncomfort when wearing denture. The results of five years follow-up show that two stages reconstruction are better than HA insertion only. HA is a kind of ideal material of bone replacement, which is not resorbed in most cases.

Adult↗
PubMed2000

Resting tongue position and its relation to the state of the dentition: a pilot study.

The position of the resting tongue has been reportedly classified as normal or abnormal. The problems introduced by the abnormal tongue position relating to denture retention and stability have been sufficiently underlined. In the present study, the bibliography on the abnormal tongue position and its effect on denture function was reviewed. Additionally, the criteria for characterizing the tongue position as well the causes of the abnormalities, as reported in the literature, were discussed. Finally, a pilot epidemiological study was conducted, with the purpose to determine the incidence of the abnormal tongue position among edentulous patients as opposed to the dentate. The criteria used for the determination were criticized, and the mechanisms potentially leading to this habit were discussed. The findings indicate that the habit development is associated with the loss of natural teeth, therefore the mechanism relates to the functional and anatomical changes of the oral environment resulting from it. An epidemiological project has been designed, with the purpose of uncovering the associations between the observed tongue position and certain functional and anatomical features, as suggested by the present study.

Adult↗
PubMed2001

Fabrication of conventional complete dentures for a left segmental mandibulectomy patient: a clinical report.

Without preprosthetic reconstructive surgery, denture fabrication for mandibulectomy patients becomes extremely difficult. Implant-assisted overdentures may improve denture retention and stability, but some patients cannot afford this treatment. For the segmental mandibulectomy patient described in this report, properly fabricated conventional complete dentures provided comfort and sufficient function.

Aged↗
PubMed1995

Retention and stability of the maxillary denture during function.

The objectives of this study were to provide a quantitative account of the extent to which the maxillary complete denture moves during function (chewing, swallowing, and speech production) and to determine whether differences in movement occur as a function of denture fit. A total of 24 patients were studied, 12 with poorly fitting dentures and 12 with well-fitting dentures. Denture movements were measured with a Myotronics kinesiograph that tracked the movements of a small magnet attached to the inferior surface of the denture. Results indicated that denture movement was greatest for the two chewing activities; varied extensively from individual to individual; and that there were no statistically significant overall movement effects as a function of fit. It was concluded that all maxillary dentures are subject to movements in all directions, but that the degree of movement is related more to the individual denture wearer than it is to the fit of the denture.

Aged↗
PubMed2005

[Clinical study of complete dentures supported by two endosteal magnetic-attachment implants].

OBJECTIVE: To evaluate treatment outcomes of mandibular complete denture supported by two endosteal magnetic-attachment implants in edentulous patients with severe mandibular alveolar ridge absorption. METHODS: Eight edentulous patients with severe mandibular alveolar ridge absorption were chosen. Each of them was treated with a complete denture supported by two CDIC implants. The implants were inserted at the areas of two the first premolars respectively. After five months, two magnets were adhered to the inside of the complete dentures. Retention, masticatory efficiency and maximal masticatory force were measured before and after the magnets were adhered and six months later. RESULTS: Statistical analysis revealed that retention, masticatory efficiency and maximal masticatory force were all increased after the magnets were adhered (P < 0.01) and six months later (P < 0.01). CONCLUSION: Retention, maximal masticatory force and masticatory efficiency were significantly increased after the endosteal magnetic attachment implants were applied. It is concluded that mandibular complete denture supported by two endosteal magnetic attachment implants is an effective method for severe alveolar ridge absorption cases.

Alveolar Process↗