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Biomedical subjects

R G Jagger

Publications and source records attributed to R G Jagger.

53 records · Page 3Linked to original sources
PubMed1980

The surface structure of the temporomandibular joint disk: a scanning electron microscopic study.

The surface appearance of seven temporomandibular joint disks obtained at postmortem has been studied by scanning electron microscopy. Two of the disks had lateral perforations which corresponded, in position, to macroscopic changes in the condylar and temporal joint components. The nature of the disk surfaces has been described. The central portion of the disks consisted of tightly bound collagen bundles; the bundles of the anterior and posterior parts were more loosely bound and irregularly orientated. The implications of the findings have been discussed in terms of articular function and dysfunction and of disease processes within the joint.

Aged↗
PubMed1978

Pharmacotherapy of masticatory system dysfunction.

The decision to use drugs systemically in the management of mandibular dysfunction must be made with consideration of the information summarized in this report. It has been shown that pharmacotherapy may be effective. It has also been demonstrated that systemic pharmacotherapy frequently produces side effects which are occasionally severe. The clinician must decide on the appropriateness of therapy with the knowledge that many other conservative measures may also have excellent success rates and that pharmacotherapy is likely to be palliative rather than curative.

Anesthesia, Local↗
PubMed1978

Effect of the curing cycle on some properties of a polymethylmethacrylate denture base material.

The properties of a denture base material may be modified by altering both the temperature and the time of heating during the curing cycle. In this study a polymethylmethacrylate denture base containing no crosslinking agent was polymerised using four different curing cycles. The structure of the materials so obtained was investigated by an acid etching technique. The materials were characterized with respect to degree of cure, strength and water sorption. It was concluded that: 1. No correlation was observed between the curing cycles and polymer structure. 2. The curing cycle of 7 h at 70 degrees C plus 1 h at 100 degrees C produced best indentation strength and tensile strength. 3. A correlation was observed between residual monomer, indentation resistance, tensile strength and water sorption. This suggested that residual monomer concentration is the most important parameter in the determination of the properties of the material investigated in this study.

Chemical Phenomena↗
PubMed1978

Multiple myeloma involving the temporomandibular joint: report of case.

A case of multiple myeloma was reported in which the initial symptom was pain and dysfunction of the TMJ that resulted from pathological fracture of the mandibular condyle. An initial radiographic skeletal survey showed no evidence of further lesions, although hematological and biochemical tests indicated a diagnosis of multiple myeloma. Treatment resulted in improvement of symptoms and of an evident regression of the lesion after 18 months. After a year, however, radiographs disclosed generalized skeletal involvement; deterioration of the general condition followed.

Fractures, Spontaneous↗
PubMedDate not supplied

Water absorption of (RTV) silicone denture soft lining material.

OBJECTIVES: The reason for high water absorption by room temperature vulcanizing (RTV) silicone denture soft lining materials has not been demonstrated previously. An experimental room-temperature vulcanizing (RTV) silicone soft lining material which had been shown to have good mechanical properties had high water absorption at equilibrium whilst losing only small amounts of soluble material after desorption. The volume change in the material was also high. A variety of formulations of the experimental material was devised in order to determine the cause of the high water sorption values. METHODS: Water sorption values were determined using standard experimental techniques. Sections of the polymerized materials were examined by scanning electron microscopy for microporosity. RESULTS: Neither removal of residual cross-linker nor changing the method of polymerization reduced the water absorption. Scanning electron microscopy did not demonstrate a porous structure of the polymerized material. A correlation was seen between filler content and water absorption. A formulation without filler showed a greatly reduced water absorption and volume change. CONCLUSION: It was concluded that the filler was directly responsible for the water absorption of the RTV material.

Absorption↗
PubMedDate not supplied

The TMD series.

Explore the source record for details and available documents.

Craniomandibular Disorders↗
PubMedDate not supplied

The oral health of psychiatric in-patients in South Wales.

Little information is available regarding the oral health of hospitalized psychiatric patients. The aims of the study were: to quantify the oral health status and identify dental treatment needs of hospitalized psychiatric patients in South Wales; and to compare the oral health of subgroups within the population by their age, psychiatric diagnosis, psychotropic medication use, and length of stay. The total patient population of the hospitals involved in the study was 469, and 326 subjects (70%) took part in the study. The mean age of the subjects was 71.1 years, with 265 long-stay and 61 short-stay patients. Forty-seven percent of patients had a psychiatric diagnosis of dementia, 23% of schizophrenia, and 19% of depressive illness. The examination included assessment of oral hygiene, periodontal condition, and prevalence of caries. The treatment needs of the population were also determined. It was found that 63% of the population was edentulous. The mean DMFT score was 19.1 +/- 7.9 (SD). Comparison with the DMFT of the general population showed a similar level of decay, fewer filled teeth, and more missing teeth in the study population. The oral hygiene of the dentate population was poor, and there was little periodontal disease. Treatment needs were mainly for scaling and polishing. There were no significant differences found between subgroups within the population.

Acute Disease↗
PubMedDate not supplied

Wettability of visible light-curing denture lining materials.

PURPOSE: Wetting characteristics of denture lining materials indicate the degree of salivary lubricating effect, which promotes denture retention and patient comfort. This in vitro study investigated the wettability of ten commercially available visible light-cured denture lining materials. MATERIALS AND METHODS: Ten soft and hard visible light-curing materials, one autopolymerized hard lining material, and one autopolymerized denture base material were evaluated for wettability. Wettability was estimated by measuring the equilibrium and hysteresis contact angles using the dynamic contact angle analysis, or Wilhelmy, technique. RESULTS: The equilibrium contact angle ranged from 59.9 to 77.3 degrees, and contact angle hysteresis ranged from 14.7 to 30.6 degrees. CONCLUSION: Visible light-curing lining materials exhibit wetting properties similar to the conventional hard lining and denture base materials.

Acrylic Resins↗
PubMedDate not supplied

Bone strength of resilient lining materials to various denture base resins.

Adhesion failure of resilient lining materials to poly(methyl methacrylate) denture base material is a problem that is encountered clinically. This study compared the shear bond strength of some of the commercially available resilient lining materials to various denture base resins. Significant differences were observed in the shear strengths between the selected resilient liners and the denture base materials. Coe Super Soft specimens failed principally cohesively. Molloplast-B specimens always failed cohesively and Novus specimens always failed adhesively. Therefore, it was apparent that the bond strengths of Molloplast-B and Coe Super Soft specimens exceeded the cohesive strength. The bond strength of Novus was dependent on the denture base material and was greatest with Lucitone 199 and TS 1195.

Acrylic Resins↗