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Biomedical subjects

J F Simon

Publications and source records attributed to J F Simon.

18 recordsLinked to original sources
PubMed1992

Improved retention of acid-etched fixed partial dentures: a longitudinal study.

Debonding of acid-etched fixed partial dentures has been a problem since their introduction. A study was conducted to determine whether this problem could be resolved by modifying the mechanical retention of tooth preparations. Retentive grooves were prepared at the line angles to create mechanical locks for the resin bonded fixed partial denture. The 4-year retention of posterior resin-bonded fixed partial dentures improved from 60% to 95% by the placement of the proximal grooves. This study was conducted in a dental school clinic during a period of 10 to 52 months. The results demonstrated that design modifications were necessary to improve clinical longevity so that the restoration could be considered "permanent" in the traditional sense. The less-experienced dentist may be more confident of the treatment with the recommended modifications and projected longevity.

Acid Etching, Dental↗
PubMed1992

[One hundred and twenty-five consecutive choledochotomies for suspected lithiasis without mortality. Current state of complications from common bile duct surgery].

The postoperative courses of 125 consecutive surgical common bile duct explorations performed between 1983 and 1990 were analysed. All cases of common bile duct lithiasis, but three, were operated on. Intraoperative cholangiography was performed in 98 percent and cholangioscopy in 92 percent of patients; common bile duct stones were found in 95 patients (76 percent); the common bile duct was sutured without drainage in 78 patients (58 percent). There were no deaths. Morbidity was 14 percent, of which 10 percent were serious. Four percent of common bile ducts retained stones. The specific morbidity was 4 percent. These results confirm the reliability of surgical management of common bile duct stones and therefore should be considered for the evaluation of new procedures, such as laparoscopic treatment of common duct stones, or combined laparoscopic cholecystectomy and endoscopic sphincterotomy.

Aged↗
PubMed1992

The search for a profile of aptitudes that characterize dentists.

This article is a reinterpretation of an unsuccessful attempt to develop a standard battery of aptitude measures to distinguish practicing dentists. Of 22 potential predictors used by a firm specializing in aptitude testing and career counseling, the national sample of 116 dentists tested showed few differences from the norm group, and some differences were counterintuitive. For example dentists performed no better than the norm on spatial visualization and worse than the norm on several measures of language skill and on finger dexterity. Based on these findings, this paper argues that a broad conceptualization is required when attempting to characterize the aptitudes necessary to complete dental education and to maintain a dental practice. The apparent inconsistency between these findings and successful prediction of performance in laboratory courses using available admissions instruments is explained.

Aptitude↗
PubMed1990

Clinical, biological, and endoscopic picture of attacks of Crohn's disease. Evolution on prednisolone. Groupe d'Etude Thérapeutique des Affections Inflammatoires Digestives.

One hundred forty-two patients with active colonic or ileocolonic Crohn's disease were included in a multicenter prospective study. Data collection included 28 clinical, biological, and endoscopic items; the latter were recorded according to a standardized colonoscopic protocol; a previously validated endoscopic index of severity was calculated. Oral prednisolone (1 mg/kg body wt per day) was started and maintained until clinical remission and for at least 3 and at most 7 wk. A second clinical biological and endoscopic evaluation was then performed. At initial colonoscopy, mucosal lesions were, by decreasing order of frequency, superficial ulcerations, deep ulcerations, mucosal edema, erythema, pseudopolyps, aphthoid ulcers, ulcerated stenosis, and nonulcerated stenosis (93%, 74%, 48%, 44%, 41%, 35%, 10%, 8%, and 2% of cases, respectively). No correlation was found between the clinical activity index and any of the endoscopical data (lesion frequency and surface, endoscopic severity index). Ninety-two percent of patients underwent clinical remission within 7 wk of treatment. None of the 28 clinical biological and endoscopical items collected just before treatment could predict clinical response to steroids. Only 38 of the 131 patients in clinical remission were also in endoscopic remission. In conclusion, (a) the description and severity of colonoscopic lesions in active Crohn's disease have been quantified; (b) no correlation exists between clinical severity and nature, surface, or severity of endoscopic lesions; (c) Oral prednisolone (1 mg/kg body wt per day) induces a clinical remission in 92% of patients within 7 wk; (d) resistance to steroids cannot be predicted from the data collected before treatment onset; and (e) only 29% of patients in clinical remission also achieve endoscopic remission.

Adult↗
PubMed1979

The impact of a curriculum change on student attitude and ultimate professional behavior.

The longitudinal effects of curriculum changes on student attitude and the relationship between attitudes as students and behavior as a professionals in practice are explored in this paper. A curriculum change (treatment of handicapped patients) was planned, introduced, and its effects on student attitude and professional behavior monitored. Findings indicate that: (1) exposure to handicapping conditions significantly lowered student humanitarian attitudes about the treatment of handicapped patients, (2) involvement with handicapped, regardless of the type of involvement (i.e. clinical or supervising oral hygiene care), appears to adversely affect humanitarian attitudes of students regarding handicapped patients. (3) student estimation of their future behavior is not a reliable indication of their future behavior, and (4) changes in curriculum should not be evaluated from student attitudes alone.

Attitude↗
PubMed1978

Regaining space in the mixed dentition.

Space-regaining therapy is an important treatment modality in the management of developing occlusions. Success is dependent on recognition of relationships and forces not seen when attention is focused only on the dental segment containing the lost space. This article has discussed other considerations for determining when to treat, as well as offering suggestions concerning types of appliances useful in treatment. A case was used to demonstrate the diagnostic procedure and appliance design.

Cephalometry↗