PubMed Health⌕ Search

Biomedical subjects

J R Johansen

Publications and source records attributed to J R Johansen.

14 recordsLinked to original sources
PubMed1979

The effect of denervation on trauma from occlusion.

Trauma from occlusion was induced by inserting cantilever bridges bilaterally in the mandibles of two monkeys. In one monkey the mandibular nerve was cut on one side; in the other on both sides. By this procedure possible protective action of nerve receptors in the periodontal membrane was reduced. The occlusal trauma resulted in severe damage to the pulp and resorption of the roots, but no appreciable downgrowth of the crevicular epithelium.

Animals↗
PubMed1978

Trauma from occlusion in monkeys.

Traumatic occlusion was induced in monkeys by insertion of bridges raising the bite. Both incisors and molars were used as abutments. Observation periods ranged from 7 to 24 months. No appreciable effect of the trauma on the apical proliferation of the crevicular epithelium was found. The results were the same in monkeys with or without marginal gingival inflammation before the trauma was induced.

Alveolar Process↗
PubMed1978

Gingival fluid flow after gingivectomy related to mechanical or chemical plaque control.

The effects of mechanical tooth cleaning and 0.2% chlorhexidine mouthrinses on healing after gingivectomy were compared in 8 patients by means of a "split mouth" technique. The experiment began after periodontal pack removal on day 7. Gingival fluid was sampled immediately before and on days 14, 21, 28, 35 after gingivectomy. The results showed that mechanical and chemical plaque control were equally effective in promoting healing after gingivectomy as evaluated by gingival fluid measurements.

Adult↗
PubMed1977

Influence of "time of day", pocket depth and scaling on gingival fluid flow.

Gingival fluid was sampled from the orifices of the gingival crevices in five male subjects with clinically healthy gingiva. The sampling was performed at 0915 h, 1215 h and 1515 h of the same day. Variation in "time of day" did not seem to influence the rate of gingival fluid flow. A total of 144 pockets (2-11 mm) in 19 patients were sampled for gingival fluid at the orifices. The adjacent gingiva was evaluated accordingly to the Gingival Index (GI). Gingival fluid flow was much more influenced by the degree of gingival inflammation than by pocket depth. Scaling with curettes was performed in five patients. Gingival fluid was sampled at the orifices immediately before scaling and on days 1, 14 and 28 after scaling. The flow rate decreased to a minimum on day 14 after scaling for all pocket depths and remained at almost the same level until day 28. Pockets less than 5 mm deep were more frequently without measurable amounts of fluid than pockets deeper than 5 mm on days 14 and 28.

Adult↗
PubMed1977

Periodontal treatment needs of 35-year-old citizens in Oslo.

The periodontal condition was evaluated according to the PI and the Periodontal Treatment Need System (PTNS) in a random sample of 35-year-old citizens of Oslo. The study demonstrated that periodontal disease was a major dental health problem despite the fact that 88.9% of the subjects visited a dentist regularly. No statistically significant differences were found in PI, PTNS and OHI-S values among the different sexes and educational groups. Although the majority of the subjects (77.8%) brushed their teeth more than once a day, the oral hygiene status was not satisfactory (mean OHI-S 1.56). The frequency of toothbrushing did not influence the mean PI scores. Dental hard and soft tissue lesions related to toothbrushing were found in 30.0 and 6.8% of the subjects respectively, and more often among persons brushing more than once a day than among persons brushing less frequently.

Adult↗
PubMed1977

A survey of causes of permanent tooth extractions in South Australia.

Reasons for permanent tooth extractions were studied in a survey in South Australia conducted over a two week period in which 154 dentists participated, a response rate of 43 per cent. Of 2,387 teeth extracted from 1,104 patients, caries accounted for 52 per cent, periodontal and orthodontic causes 25.6 and 11.1 per cent respectively, impacted teeth 6.5 percent, and prosthetic reasons 2.8 per cent. Caries was the most prevalent cause in the age groups 20-40 and over 70 years. Between 40 and 70 years more than 50 per cent of the teeth were extracted for periodontal reasons.

Adolescent↗
PubMed1976

Oral roentgenologic findings in a Norwegian urban population.

Orthopantomograms were taken of 111 subjects constituting a random sample of 35-year-old citizens of Oslo. The most frequent pathologic finding was marginal bone loss, which was found in seventy-one persons (64%). Fifty-one impacted and unerupted teeth in twenty-eight persons were seen, the third molars predominating. Ten retained roots were found in nine persons, and apical radiolucent areas were found on forty-four teeth in thirty-three persons. In addition to the pathologic findings, 101 endodontically treated teeth in fifty-five persons were observed.

Adult↗
PubMed1976

Dental visits, teeth remaining, and prosthetic appliances in a Norwegian urban population.

Of a random sample (177 persons) of 35-year-old Oslo citizens, 117 subjects (66.1%) attended a dental examination. Questionnaires were returned by mail from 28 of the non-respondents. The most common reason for not attending was "difficulty in finding time for an appointment." About 89% of the respondents had visited a dentist regularly. Regular dental care seemed to be more common among people with a high level of education than among those with a low level of education. The most common treatment performed at the last dental visit was filling of cavities. The mean number of remaining teeth was 25.7. Females in the lower educational group had significantly less teeth than those in the higher educational group. No subjects were totally edentulous, but five persons had one edentulous jaw. Nine full or partial dentures were found. Twelve percent of the subjects had one or more fixed bridges, and 29.9% of the persons had one or more crown restorations. There seemed to be no differences between the sexes or educational levels in this respect.

Adult↗
PubMed1975

Plaque-free zones on human teeth in periodontitis.

The surface morphology of the pocket area of extracted, periodontally involved, human teeth was studied with steromicroscope. A plaque-free zone was found to be present in all specimens. The width of the plaque-free zone was found to decrease as the pocket depth and loss of attachment increase.

Dental Plaque↗
PubMed1975

The zone of completely and partially destructed periodontal fibres in pathological pockets.

The morphology, the width and the appearance frequency of the zone completely and partially destructed periodontal fibres on human teeth were studied in the stereomicroscope. This zone was present between the most apical border of identifiable, epithelial attachment remnants and the most coronal intact periodontal fibres, and consisted of only a few fibres without any specific orientation. The mean width of the zone was 0.43 mm, and the appearance frequency almost 100%. The results of the comparison between clinical and laboratory pocket depths indicated that the pocket depths measured in the laboratory were always less deep than those recorded clinically. There seemed to be a relationship between these findings and the presence of a zone of completely and partially destructed periodontal fibres.

Connective Tissue↗
PubMed1975

The need for periodontal treatment in an urban population.

The need for periodontal treatment was estimated in a group of the citizens of Oslo. A considerable treatment need was found in spite of the high dentist/population ratio in the area. The need for surgical treatment increased with age. Estimated treatment time was higher in males than in females.

Adult↗
PubMed1975

Effect of 2-years' use of chlorhexidine-containing dentifrices on plaque, gingivitis, and caries.

Chlorhexidine digluconate in 0.1% and 0.4% concentrations was added to dentifrices to evaluate its effect on plaque formation, gingival conditions and caries in 73 dental students over a 2-year period. No differences were found in the Pl I and the G I indices between the active and the placebo dentifrices, but a possible effect on caries was demonstrated. Discolorations of anterior teeth and fillings were the only side effects observed.

Adult↗