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Biomedical subjects

J Caton

Publications and source records attributed to J Caton.

65 records · Page 4Linked to original sources
PubMed1980

Histometric evaluation of periodontal surgery. II. Connective tissue attachment levels after four regenerative procedures.

The present study was undertaken to determine the effect of four periodontal regenerative procedures on the connective tissue attachment level. The procedures tested were: 1) the modified Widman flap procedure, 2) the modified Widman flap procedure combined with transplantation of previously frozen autogenous red marrow and cancellous bone, 3) the modified Widman flap procedure in combination with implantation of beta tricalcium phosphate, and 4) periodic root planing and soft tissue curettage. Eight adult Rhesus monkeys, divided into four equal groups, were used. Periodontal pockets were produced around contralateral teeth in a standardized manner. In each group of animals, the pockets on one side of the jaws were subjected to one of the above-mentioned surgical treatments, while the contralateral pockets remained as unoperated controls. Three weeks before surgery, a carefully designed plaque control program was instituted and continued until the animals were sacrificed 12 months after surgery. In histologic sections, linear measurements along the root surfaces were made from the cemento-enamel junction (CEJ) to the most apical cells of the junctional epithelium (JE). These measurements from operated and unoperated sites were then compared. The data revealed that healing following the four different regenerative procedures resulted in the reformation of an epithelial lining (long junctional epithelium) along the treated root surfaces, with no new connective tissue attachment.

Alveoloplasty↗
PubMed1979

Establishing and maintaining clinically healthy gingivae in Rhesus monkeys.

The aim of the present investigation was to determine a method and a minimal frequency of plaque removal for the establishment and maintenance of clinically healthy gingivae in Rhesus monkeys. Six adult, male monkeys were used and divided into three groups. In each group different methods were used for plaque removal. Frequencies of plaque removal of one, two and three times per week for consecutive weeks were tested. The results showed that gingival health could be established and maintained with any of the methods used (toothbrushing and interdental flossing: toothbrushing and a 3-min application of 2% chlorhexidine gluconate) but only when plaque was removed 3 times a week. This frequency of plaque removal sessions is discussed in relation to the necessity for sedation of the animals with possible adverse side effects.

Animals↗
PubMed1979

[The use of an articulated brace in the treatment of juvenile kyphosis (author's transl)].

The authors have attempted to assess the efficiency of an articulated brace in the treatment of juvenile kyphosis (Scheuermann's disease and idiopathic kyphosis). Two series of patients were compared. Patients in both series were treated in a first stage by a plaster cast and in a second stage by a bivalve brace in the first series and an articulated brace in the second series. The technique of treatment by a plaster cast and by the brace is fully described. It is concluded that control of the lumbar lordosis is of great importance. The results were better with an articulated brace. The indications for treatment are given depending on the age at the onset of treatment, the type of spine deformity and its severity. In some cases of severe dorsolumbar kyphosis, surgery may be indicated.

Adolescent↗
PubMed1976

Osseous repair of an infrabony pocket without new attachment of connective tissue.

This report describes the osseous repair of an infrabony pocket without new attachment of connective tissue between the new bone and root surface. While the width of the connective tissue between the new bone and root surface was of approximately normal dimensions, junctional epithelium was present on the root surface.

Alveolar Process↗
PubMedDate not supplied

Epidemiological, clinical, biological and radiological differences between atrophic and hypertrophic patterns of hip osteoarthritis: a case-control study.

OBJECTIVE: Lack of osteophytes (atrophic form) has been shown to be a factor in the severity of hip osteoarthritis (OA). The aim of this study was to determine the epidemiological, radiological and biological differences between the hypertrophic and atrophic forms of hip osteoarthritis. METHODS: 25 patients with symptomatic hip OA (ACR criteria) and classified as having an atrophic form of OA based on the lack of osteophytes on standard radiograph of the pelvis, were matched for joint space width with 25 subjects with evidence of the hypertrophic form of hip OA. OA radiological severity was assessed using a scoring system and by computer measurement of the joint space width. Angles of hip dysplasia were measured. Serum hyaluronic acid, cartilage oligomeric matrix protein, collagenase, Type I procollagen, C-terminal crosslinking telopeptide of type I collagen and tissue inhibitor of métalloproteases-1 were assayed by immunoassay and C-reactive protein by ultrasensitive immunonephelemetry. Statistical analysis was performed using logistic regression, taking into account age, sex, body mass index, and bilaterality. RESULTS: Compared to hypertrophic OA, atrophic OA affected chiefly elderly women and was characterized by a smaller centre-edge angle and diffuse superior femoral head migration. It was less frequently bilateral. No statistically significant difference was found in the biological data between the two groups. CONCLUSION: An atrophic bone response in hip OA occurs chiefly in women and is associated with poor coverage of the femoral head. Serum biomarkers able to demonstrate differences between the atrophic and hypertrophic patterns of OA are lacking.

Aged↗