Search PubMed⌕ Search

Biomedical subjects

P R Likeman

Publications and source records attributed to P R Likeman.

18 recordsLinked to original sources
PubMed1998

Affective state and acceptance of dentures in elderly patients.

OBJECTIVE: To examine the relationship between the affective state and acceptance of dentures by elderly patients. SETTING: Dental Outpatient clinics and a residential home for the elderly. Bialystok, Poland. DESIGN: Cross sectional survey of denture wearers. SUBJECTS: One hundred and forty one patients between the ages of 60-94. INTERVENTION: A semi-structured interview, which focused on the patient's self-evaluation of their affective state, and a clinical examination. RESULTS: There was a trend for the negative affects (irritability, boredom, anger, loneliness, helplessness) to relate to denture intolerance and for the positive affects (joy, peace, usefulness) to relate to denture acceptance. CONCLUSIONS: Anger related significantly to intolerance of upper and lower dentures. The relationship of age and gender to the acceptance of dentures in the present sample was not significant.

Adaptation, Psychological↗
PubMed1997

Eight weeks in Warsaw.

In October and November 1996 I worked for 8 weeks in the Department of Prosthetic Dentistry, Institute of Stomatology, Medical Academy of Warsaw, Poland, at the invitation of the Head of Department, Professor E Spiechowicz. My objective was to carry out an academic audit of the teaching of partial denture prosthetics.

Communism↗
PubMed1997

Tongue control of lower complete dentures: a clinical hint.

Lack of tongue control may be one reason why patients experience unstable complete lower dentures. The author suggests a method to help patients acquire that control and considers other possible reasons for instability of lower dentures.

Denture Retention↗
PubMed1995

An investigation into the effect of denture fixatives in increasing incisal biting forces with maxillary complete dentures.

The effect of denture fixatives on incisal biting forces was investigated in five subjects wearing maxillary complete dentures. Forces required to displace new and old dentures with and without fixatives were measured up to six hours post-insertion using a force transducer. The results showed that incisal forces were greater with new dentures than with old dentures when only saliva was present. After the application of fixative to the old dentures, the difference from the new dentures without fixative became insignificant. It is concluded that the improvement in retention of complete dentures with the use of fixatives allowed patients to increase their incisal biting capability.

Adhesives↗
PubMed1993

An examination of cingulum rest seats in incisor and canine teeth.

This study examined rest seats prepared in the cingula of incisor and canine teeth in terms of their form and their ability to offer denture support. Fifty rest seats prepared in vivo were examined and the fit of the denture framework was assessed at the trial insertion stage. Twenty two of the rests investigated showed no approximation (within 0.1 mm) between the casting and the floor of the rest seat. Investigations in vitro showed the provision of rest seats reduced the labial displacement of incisor and canine abutments under transmitted load compared to the same teeth without preparations.

Cuspid↗
PubMed1991

Some factors affecting retention forces with the use of denture fixatives in vivo.

Using the UCL retentiometer, the effect of three proprietary denture fixatives has been clinically investigated in 14 dentate subjects wearing mucosal-borne acrylic palatal plates over periods of 6 hours. The results showed that retention forces with saliva for the well-fitting plates were significantly better when compared with the forces for the ill-fitting plates. A substantial improvement in retention on all occasions was seen for both types of plate after the application of fixatives. An interesting observation of this study was that the use of paste and liquid fixatives rendered the ill-fitting plates as retentive as the well-fitting plates with the same fixatives. The test fixatives, however, showed significant differences regarding the onset and duration of action, depending on their physical formulation. The paste and liquid fixatives were found to have more delayed action than the powder fixative, but maintained the improved retention for a post-insertion period of more than 6 hours for both well-fitting and ill-fitting plates. Investigation of the effect on retention of different quantities of fixatives showed that larger amounts were associated with greater retention. The findings of these studies predict that a single application of 0.6 ml of either the paste or liquid fixatives used in this study is a recommended quantity which would provide and maintain the desirable retention for more than 6 hours in most cases of well-fitting complete dentures and those with retention problems. The powder fixatives though very effective immediately, would, however, require repeated applications every 3 hours or so, depending to some extent upon the use that the product will be put to.

Carboxymethylcellulose Sodium↗
PubMed1991

An investigation of the displacement of fixed bridges and their abutments under occlusal load in Monkeys (Macaca Fascicularis).

Previous investigations have established the displacement characteristics of the teeth under axial load in monkeys (Macaca Fascicularis). The methods employed in these investigations have been used to study the displacements under occlusal load of both conventional fixed bridges and cantilever bridges, having different numbers of abutments. Under axial load there was a reduction in displacement when two teeth were splinted together to act as abutments to a fixed bridge compared with the displacements of the individual teeth. Loading on the pontics of the cantilever bridges showed the greatest displacements and caused tipping forces in the abutments. Recommendations that a cantilever bridge should replace only one unit and have not less than two abutments are supported.

Animals↗
PubMedDate not supplied

A study on the use of the dentatus AEB face bow and its modification as an ear bow.

This study investigated the siting of the earbow mounting pins on the Dentatus ARL articulator relative to the condylar axis. Further, it showed the repeatability of registrations using the Dentatus AEB face bow and its modification as an earbow. Three face bow and three earbow recordings were made of 35 subjects. Registrations were fitted onto the subject's cast mounted on the articulator to show differences in the recording of the condylar axis. The mean horizontal relationship between the earbow and face bow registrations approximated to the relationship of the earbow mounting pin to the opening axis of the articulator. The mean diameter of the spread of registrations was less for the earbow than the conventional face bow. The use of the earbow modification to the Dentatus face bow is supported.

Dental Articulators↗
PubMedDate not supplied

The surface of investments poured against different duplicating media.

Two phosphate-bonded investments that were poured into molds of a duplicating gel and a poly(vinyl siloxane) duplicating medium were examined for surface hardness. Untreated surfaces were also examined by the confocal microscope and the scanning electron microscope. The Brinell hardness of samples poured in poly(vinyl siloxane) was greater than that of the same investment poured in duplicating gel. Investments were hardest as set and were significantly softened by drying. Cast hardeners achieved some rehardening of the dried investment samples. Microscopic examination of the investment surfaces revealed greater irregularity of samples poured in duplicating gel than in poly(vinyl siloxane), particularly in one investment.

Agar↗