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A clinical comparison of four denture adhesives.

The influence of four denture adhesives (Fittydent, Super Poligrip, Super Wernet's, and tragacanth) on patients' opinions of 10 aspects of denture use was studied. The adhesives were applied in turn to the existing complete dentures of 32 patients in a sequence determined by eight randomly chosen 4 x 4 Latin squares of different treatments. Subjective views of the patients indicated that one product significantly improved denture retention and had other favorable features.

Adhesives↗

Edentulous ridge augmentation. Part II.

Edentulous ridge augmentation has evolved from an attempt to control progressive atrophy of both denture-bearing bone and soft tissue. Preprosthetic surgery to reverse these undesirable conditions should only be attempted after other methods, such as proper denture construction, proper patient compliance, and patient management have been unsuccessful. Also a thorough evaluation by both a prosthodontist and an oral surgeon is required. Prosthodontically, the surgical procedure should produce the following features: (1) enlargement of the area of bony support, (2) improved contour of the ridge for denture stability, and (3) elimination of the displacing action of muscle attachments on the complete denture. Ideally we would like to combine all of these distinct features to arrive at the goal of optimum denture retention. The oral surgeon must also be aware of these principles, and in essence, determines the immediate post-surgical results. However, the oral surgeon is also limited by specific patient factors such as systemic conditions, oral health maintanence, and finances. He must recognize these and determine which surgical methods would give the best denture retention and patient service. It is in this context that the prosthodontist and oral surgeon must work together to facilitate total patient care.

Alveolar Ridge Augmentation↗

[Augmentation of alveolar process with hydroxylapatite--clinical orthodontic experience].

23 Patients were followed up clinically and by X-ray. In this cohort eight maxillary and 19 mandibular alveolar bone augmentations with hydroxylapatite granules mostly in a subperiosteal tunnelling procedure had been done. In most cases prothetic treatment was administered in our hospital. The dentures had been in place for a little over three years. Over this period of time there was hardly any change in the shape of the augmented ridges, denture retention, and vertical dimension. Drawbacks of the procedure became evident as reduced load resistance of oral mucosa during mastication and recurring impingement spots. In some cases, particularly when there was little vertical bone height, pain occurred in the area of the mental nerve.

Alveolar Ridge Augmentation↗

Overdentures--when and how.

Implant borne overdentures are a reliable and simple solution to denture retention and stability problems. Such a treatment option requires careful planning and the basis for this is made from the results of clinical trials. An overdenture symposium on this subject was held at Naantali, Finland on 26th August, 1994. The following paper is a summary of the proceedings.

Dental Prosthesis, Implant-Supported↗

Effects of rehabilitation with conventional removable partial dentures on oral health--a cross-sectional study. Part II. A comparative study of treatment results at two Public Dental Clinics and the Faculty of Odontology in Gothenburg.

Sixty-five patients from two counties, rehabilitated with conventional partial dentures, participated in a clinical study of oral and denture hygiene, periodontal health, incidence of caries, denture retention and frequency of use. The clinical study was supplemented with an anonymous questionnaire. The aim of the study was to describe the consequences of the treatment with respect to the oral tissues and to compare the findings with those in a corresponding study of patients treated at the Faculty of Odontology in Gothenburg. The results show deficiencies in periodontal and cariological pretreatment and follow-up. The subjective results of the prosthodontic treatment seem, however, to be satisfactory, as was the frequency of use of the dentures (92 per cent). The study shows a need to improve the quality of dental care for adults. The current decline in demand for dental care for children should release resources for treatment of adults in the Public Dental Service.

Adult↗

Titanium for removable denture bases.

The aim of the present study was to compare titanium-base and resin-base maxillary complete dentures. In 13 patients with a maxillary complete denture with a titanium base (group I) and in 12 patients with a maxillary complete denture with a resin base (group II), the (a) patient's adaptation to the denture, (b) denture retention and (c) appearance of the mucosa under the denture were evaluated. In all cases, the adaptation was assessed with a questionnaire, while the retention and the appearance of the mucosa were assessed by clinical examination. None of the three measures considered (adaptation, retention and mucosa appearance) differed significantly between patients with titanium-base dentures and patients with resin-base dentures. Titanium bases are suitable for dentures likely to be subject to severe mechanical stresses (as in the case of maxillary complete dentures opposing natural teeth), and in patients who show hypersensitivity responses to other materials.

Acrylic Resins↗

Installing magnetic keepers using LASER welding.

Magnetic overdenture attachments can provide useful denture retention. A technique is proposed that involves installing the magnetic keeper in the overdenture abutment coping using laser welding. Compared with the conventional cast-to technique, the new technique provides a suitable contour to the abutment coping with the magnetic keeper and ensures proper mounting in the abutment coping, installing the magnetic keeper easily and effectively.

Dental Abutments↗

[Extension implantations as an aid in defect-restoring prosthodontics].

Because of a lack of denture retention, great difficulties are often encountered in edentulous patients who require prosthetic treatment of defects in the maxillo-facial region. The use of enossal implants may enable temporary rehabilitation with regard to mastication and speech. The possible range of indication is considerably limited in cases of extensive defects of the alveolar process, advanced atrophy and by radiological therapy of malignant tumors. The duration of therapeutic success is contingent upon most accurate implantation techniques and prosthetic treatment as well as the patient's oral hygiene.

Aged↗

Use of mandibular implant overdentures: treatment policy in prosthodontic specialist clinics in Sweden.

The aim was to examine the use of mandibular implant overdentures in Swedish prosthodontic specialist clinics. Questionnaires related to treatment with mandibular implant overdentures during 2001 were sent to the heads of the 30 prosthodontic specialist clinics of the Public Dental Health Service in Sweden. Completed questionnaires were received from 28 (93%). The number of treatments with mandibular implant overdentures varied much among the clinics (0 to 22). Seven clinics had not performed any such treatment, and the median number was 2. The number of fixed implant-supported prostheses was much higher (median value 17, range 4 to 100). The correlation between the number of implant overdentures and fixed implant-supported prostheses in edentulous mandibles was weak (r = 0.33; P = 0.10). The most common anchorage system was ball attachments on two unsplinted implants. The most common reason for the choice of the overdenture treatment was the reduced cost, whereas the patient's main wish to improve denture retention came next. The question whether the demand for implant overdentures had increased during the last few years, was answered with "no" by 19, with "yes" by 5 and with "don't know" by 4 clinics. All but one responded that their attitude to implant overdentures had not changed after the introduction of free pricing in Swedish dentistry. It can be concluded that compared to the rapidly increasing international use of mandibular implant overdentures, this treatment of edentulous patients is rare in Sweden, where fixed implant-supported prostheses still are predominant.

Dental Clinics↗

[The new magnets for dental prostheses].

With the introduction of metallic alloys based on rare earth, the dental prothesis disposes of new magnets as a method of denture retention whose retentive force is 20 to 50 time superior to the conventional magnets. There are two main types of magnets: the open field magnets as the Dyna and the closed field magnets as the Gillings and the Jackson. The latters have been devised to avoid propagation of the magnetic field in the living tissues, the harmlessness of this propagation being argued by the researchers. The magnets present several advantages tied to the conservation of the roots as the maintenance of the proprioception, the conservation of the socket bone, the strengthening of the remaining teeth and the psychological comfort for the patient, others tied to the technique itself as the simplicity of realization, the easiness of insertion and removal of the prothesis and the absence of wear. As far as terminology is concerned, we consider a magnet as a magnetic axial attachment.

Denture Design↗

Vestibular and lingual muscular pressure on complete maxillary dentures.

Denture retention may be defined as the ability of a denture to remain seated on the supporting tissues under various conditions. Soft tissue function influences the retention of removable prostheses by exerting pressure against the polished surfaces. The magnitude of this pressure on complete maxillary dentures under experimental conditions was studied. Five denture wearers participated. Miniature pressure transducers were placed at nine selected locations on the polished surfaces of the dentures: one on each tuberosity, three along the vibration line, and four on the vestibular flanges. The transducers were flush with the polished surfaces but discernible to the participants. Ultra-thin electrical wires connected the transducers to a power supply and recording equipment. Loading the incisors with 40 N in a cranial direction elicited soft-tissue pressure against the transducers. The highest values were recorded in the region of the tuberosities (51 kPa). Intermediary values were recorded along the vibration line (27 kPa), and the lowest pressure was recorded on the vestibular flanges (17 kPa).

Aged↗