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Biomedical subjects

A A Grant

Publications and source records attributed to A A Grant.

At least 19 recordsLinked to original sources
PubMed1994

Phonetic determinants of tooth placement in complete dentures.

The provision of satisfactory complete dentures requires that dentist, technician, and patient adequately fulfill their respective roles in the provision of, and adaptation to, these dentures. The clinician should combine clinical skills and appropriate patient management, in addition to an appreciation of postextraction resorptive changes in the alveolar ridges, if clinically acceptable dentures are to be prescribed. An increasing number of replacement dentures are being prescribed for older patients; thus, the need to utilize functional factors to determine tooth placement is reviewed.

Articulation Disorders↗
PubMed1994

Osseoretention? Comparative assessment of particulate hydroxyapatite inserted beneath immediate dentures.

This paper presents the results of a study to observe the effect on bone resorption and residual alveolar ridge form, of placement of dense non-resorbable hydroxyapatite granules into fresh canine sockets, at the time of immediate denture provision. Thirty five subjects were randomly divided into two groups cross matched for age and sex. All subjects required bilateral extraction of at least a lower canine and an adjacent tooth. Results demonstrate that six months post-extraction the control group had lost four times more bone than the implant group. These results were highly significant (P=0.000, LHS and P=0.001, RHS).

Adult↗
PubMed1993

The stability of temporary prosthetic base materials. I: Introduction, angular changes and dimensional stability.

The bases of occlusal rims and trial dentures should fit both the cast and the mouth accurately. The retention of shape and dimension of strips and sheets of grey and pink shellac, filled cold cure acrylic resin and wax were tested following moulding over stylised upper edentulous casts. The thermoplastic materials were softened over a flame or in a water bath. Specimens were prepared with and without folding along the long axes of the strips. The angles formed by the strips, the gap between the palate of the baseplates and casts and the linear dimension of the sheets were measured after moulding, after immersion in water at 37 and 45 degrees C and after 24 h at room temperature. The least angular change was shown by unfolded grey shellac, softened over a flame and moulded by finger pressure over an unwarmed cast, followed by folded specimens softened in water and moulded with the fingers over a prewarmed cast. The least gap developed beneath pink shellac softened in water and moulded by finger pressure over a warmed cast. The smallest dimensional change was shown by grey shellac softened in water and moulded by finger pressure over a warmed cast. Thus, optimally manipulated shellac materials exhibit less change after moulding than cold cure acrylic resin or modelling wax.

Acrylic Resins↗
PubMed1993

Measurement of the viscosity of irreversible hydrocolloids.

Three techniques have been used to assess the shear rate dependence of the viscosity of mixed alginate impression materials prior to setting. Two methods used a cone-plate viscometer, and one method was a capillary extrusion technique. Data from the three sets of experiments have been critically compared. It has been shown that an unset alginate material exhibits Bingham behaviour.

Alginates↗
PubMed1992

Treatment options for the edentulous mandible.

Prosthodontic literature is replete with articles reporting longitudinal studies of, and clinical and laboratory procedures for, dental implants. There is no doubt that implant-borne prostheses are ideal treatment options for some patients; for other, alternatives must be considered. The purpose of this article is to present an overview of the aetiology of mandibular atrophy and to review a broad range of treatment options for patients who have atrophic mandibles. Whilst techniques are listed for completeness and not necessarily out of preference, with epidemiological and demographic trends in mind, the need for preventive prosthodontics is emphasised.

Alveolar Bone Loss↗
PubMed1990

Dental care for elderly people by general dental practitioners.

In Salford, the care and facilities for elderly people provided by general dental practitioners in practices having three or more dentists were compared with those given in smaller practices. Accessibility and size of dental practice were significantly related, with larger practices being more accessible to elderly and disabled people than smaller ones. A domiciliary service was given by all dentists, regardless of size of the practice. Forty-three per cent of dentists in the larger but none in the smaller practices recalled full denture patients. Eighty-seven per cent of dentists in the larger practices, compared with 53% of those in small ones, gave correct answers to seven or more of 14 questions about the elderly. Attitudes towards the elderly were measured using a seven-point scale: the more favourable the attitude, the higher the score. The mean score for dentists in large practices was 5.13, which was significantly greater than the mean score of 4.16 for those in small practices (P less than 0.001).

Attitude of Health Personnel↗
PubMed1990

Investigation into the cleanliness of dentures in an elderly population.

During a survey of 233 elderly people of whom 89.9% were edentulous, attitudes toward denture cleaning were investigated. Questioning revealed the frequency of cleaning and methods used. Examination showed which dentures were clean, types and amounts of stain present, and comparison of clean dentures directly with dirty ones. Comparison of different residential groups highlighted problems particular to a group, so that recommendations for improvements could be made. Only 40% of dentures were properly clean. Subjects resident in the long-stay hospitals had the cleanest dentures and those in the elderly persons' homes the dirtiest. One quarter of the dentures examined were over 30 years old. They tended to be dirtier than the newer ones and related to a higher incidence of denture stomatitis. Wearers of cleaner dentures were more satisfied with their cleansing methods and more likely to use a proprietary cleanser regularly than those with dirty dentures.

Aged↗
PubMed1989

Vocal fundamental frequency characteristics during the first two years of life.

Vocal fundamental frequency (Fo) characteristics were sampled for a group of seven young children. The children were followed longitudinally for a 12-month period, spanning preword, single-word, and multiword vocalizations. The Fo characteristics were analyzed with reference to chronological age, vocalization length, and lexicon size. Measures of average Fo and Fo variability changed little during the 12-month period for each child. A rising-falling intonation contour was the most prevalent Fo contour among the children. In general, the influence of vocalization length and language acquisition on measures of Fo was negligible. It is suggested that relative uniformity in vocal Fo exists in early vocalizations across preword and meaningful speech periods.

Child, Preschool↗
PubMed1988

The effect of variation of residual ridge angle on partial denture abutment tooth movement.

Using a laboratory model simulating a free-end saddle partial denture situation, the effect of variation of the angulation of the crest of the residual alveolar ridge to the horizontal on movement of the abutment tooth and saddle was observed. It was found that the inclination of the residual ridge affected the direction and magnitude of abutment tooth movement. The direction of abutment tooth movement was not related to the position of the occlusal rest. However, the magnitude of saddle and abutment tooth movement is affected by the design of the clasp used.

Alveolar Process↗