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Biomedical subjects

L Hollender

Publications and source records attributed to L Hollender.

At least 73 records · Page 4Linked to original sources
PubMed1977

Dental caries and restorations in teenagers. I. Index and score system for radiographic studies of proximal surfaces.

An index and a score system for radiographical longitudinal studies of caries progression on proximal tooth surfaces are presented and compared with the DF-surface system. Generally, a good correlation between DF-surface differences and scores was found in a three-year study on teenagers. However, the score system seems to forward better means for a detailed study of the individual.

Adolescent↗
PubMed1977

Dental caries and restorations in teenargers. II. A longitudinal radiographic study of the caries increment of proximal surfaces among urban teenagers in Sweden.

Within a group of 16 year old school children leaving the regular school dental care, the number of carious lesions and fillings in proximal tooth surfaces was radiographically studied, using an index system. Three years later, the same individuals were re-examined. The results showed that intact surfaces and surfaces with small carious lesions were more resistant to change than others. A minority of the individuals was found to be responsible for a majority of the lesions established during the three year interval. Generally, the progress of caries was slow.

Adolescent↗
PubMed1976

Treatment of non-vital permanent incisors with calcium hydroxide. VI. A clinical, microbiological and radiological evaluation of treatment in one sitting of teeth with mature or immature root.

The purpose of the investigation was clinically, microbiologically and radiologically to assess the effect of calcium hydroxide as a temporary root-filling inserted in the same sitting as root canal debridement in non-vital permanent incisors with mature and immature root, infected or uninfected root canal and with or without radiologically demonstrated periapical bone changes. The material consisted of 141 teeth divided in 3 groups in which mechanical cleansing was accompanied by flushing with sterile saline and sodium hypochlorite solutions giving 0.5% or 5.0% active chlorine, respectively. Microbiological samples were taken from root canals after extirpation of necrotic pulp tissue, after completed cleansing of the root canal and 3 and 6 month after treatment. Results of treatment were evaluated from the radiographs taken before treatment and at the 3 and 6 month follow-ups. Complication, pain and an abscess, occurred in 2 cases, 2 and 5 days, respectively, after treatment. No statistical correlation between occurrence of samples that gave growth, taken from the root canals at 3 (8%) or 6-month control (9%) and 1) bacteriological status of the root canal prior to filling with calcium hydroxide, 2) the development of the root or 3) periapical healing at 3 or 6 month follow-up could be ascertained. Periapical bone healing at the end of 6-months observation period was noted in 61 teeth (46%), regression of periapical bone lesions in 64 (49%) and no periapical healing in 6 (5%). The only difference in healing pattern, statistically significant on 0.1% level, was found in the group of teeth flushed with 5.0% sodium hypochlorite. At 3 month control they showed percentually less cases with regression and more cases with no healing of periapical bone lesions than the teeth in the other two groups. It was concluded that treatment in one sitting can be done routinely, irrespective of the initial status, in all those cases where no other treatment is possible. If the periodontium or the periapical bone are injured during cleansing procedures or if necrotic rests are not pressed out through the apical foramen, no complications after treatment need to be feared.

Adolescent↗
PubMed1976

Antimicrobial effect of root canal débridement in teeth with immature root. A clinical and microbiologic study.

The aim of present investigation was to compare the antibacterial effect of biochemical root canal cleansing in permanent non-vital upper incisors with immature with those with mature root. The material comprised three groups made up of 34, 46 and 28 teeth in which the mechanical cleansing was accompanied by flushing with sterile saline and sodium hypochlorite solutions giving 0.5 or 5.0% active chloride, respectively. Samples were taken in root canals initially after removal of necrotic tissue and after completed cleansing, transferred to solid and liquid media for aerobically and anaerobically and incubated until growth appeared or up to 10 days. The microorganisms were identified by biochemical tests and gas-chromatographic analysis. The antibacterial effect of mechanical cleansing with sterile saline was very low (9%) and limited to the teeth with mature root. The flushing with sodium hypochlorite increased the antibacterial effect to about 25%. No statistical difference was found in the antibacterial effect between flushing with 0.5 % or 5.0% sodium hypochlorite solutions. The antibacterial effect was, however, irrespective of the sodium hypochlorite concentrations, less good in teeth with immature root at the statistically significant 5% level. It was concluded that mechanical cleansing of root canals in teeth with immature root with the instruments now available is inadequate. This inadequacy cannot be compensated for by use of highly concentrated solution, with dissolving effect on necrotic tissue, for flushing. The use of such substances which also have toxic effect on the tissue should be avoided.

Bacteria↗
PubMed1975

Fibro-osseous lesion of the mandible mimicking chronic osteomyelitis.

An account is given of the clinical, radiologic, and pathologic, features of a special form of fibro-osseous lesion of the mandible. The material consists of fifteen cases (eleven females and four males). Two cases are described in detail. Together with Case 1, a probably unique series of radiographic pictures is presented, showing the development of the disease.

Adolescent↗
PubMed1975

A radiographic method for assessing changes in alveolar bone height following periodontal therapy.

A method is described for obtaining reproducible radiographs of several groups of teeth in the same jaw. The method was applied to assess changes in the alveolar bone height following periodontal treatment. An oral device was designed to permit direction of the central rays of the beam perpendicularly to the alveolar process in different parts of the jaws. The exposures were made at 60 kVp and 10mA, and standardized procedures were used for developing, fixing and rinsing the films. Alterations in the marginal alveolar bone level were determined in a stereocomparator system. The reproducibility of the method was determined. A pilot experiment was performed on 5 patients with periodontal disease. Following conservative treatment, including scaling and root planning, all patients were subjected to periodontal surgery, including alveolar bone denudation. Radiographs of the alveolar bone were obtained before and 2 months after the operation. By measuring in the stereocomparator parallaxes of both control points and points of the alveolar bone crest on paired radiographs, a mean decrease in interproximal alveolar bone height of 0.69 mm was found. Taking into account the small errors which are inherent in the method, this change in bone height could be regarded as a reliable measure of actual loss of bone.

Adult↗