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Biomedical subjects

R Lehtinen

Publications and source records attributed to R Lehtinen.

At least 55 records · Page 3Linked to original sources
PubMed1980

The importance of alveolar bone loss, width of periodontal space, visibility of lamina dura and divergence of roots on the rocking moments in extraction of teeth in the lower jaw.

The purpose of this study was to investigate the effect of the alveolar bone loss, with width of the periodontal space, the visibility of the lamina dura and the divergence of the roots on the rocking moments that were measured by means of strain gauges and on their acting times. Of the factors studied, alveolar bone loss had the greatest effect on the moments. The extraction time shortened when alveolar bone loss increased. When the periodontal space widened, the moments used decreased. The extraction time was significantly lengthened when the roots were diverged.

Adult↗
PubMed1980

Rocking and twisting moments in extraction of teeth in the upper jaw.

The purpose of this study was to investigate with the strain gauge method the rocking moments needed during the extraction of upper jaw teeth. In addition to the buccal and palatinal rocking moments, the twisting moment was also measured. The highest mean value of both the average and highest buccal and palatinal movements was measured during the extraction of canines. The mean value of the average buccal moments for the first and second molars was significantly higher than for premolars, but the mean value of the average palatinal moments was significantly lower for the first and second molars than for incisors and almost significantly lower than for premolars. The longest extraction times were used during the extraction of molars and canines. There was no difference in the magnitude of the moments for the upper and lower jaw canines. The extraction of the upper jaw incisors required significantly more rocking moment than the extraction of the lower jaw incisors. There was no difference between the upper and lower jaws in the mean values of the total rocking moments for premolars. The mean values of the total and highest rocking moments for molars in the lower jaw were significantly higher than the corresponding values in the upper jaw. The difference was due to the different bone structures of the upper and lower jaw and to different roots of molars in the upper and lower jaw. The extraction times for the canines and molars were significantly higher in the upper jaw than in the lower jaw.

Adult↗
PubMed1979

Penetration of disposable needles.

Six types of disposable injection needles were tested clinically for the intensity of pain caused, and their penetration capacity measured. The force nedded differed greatly with different needle types (120-250 mN). The design of the needle point was observed to have the greatest effect on the pentration capacity and the intensity of pain. To penetrate the tissue well, the needle point should have secondary bevels at the tip of the bevelled surface. The majority of the needles fulfilled this requirement.

Anesthesia, Dental↗
PubMed1979

Aspiration using prefilled dental anesthetic cartridges.

The purpose of this study was to make clear if aspiration was possible by the non-aspirating technique using non-aspirating cartridges. Four prefilled anesthetic cartridges used in Scandinavia generally were selected for study. The pressure required for aspiration varied between 130--320 mm Hg. In the majority of cases, aspiration did not occur in the pressure of 320 mm Hg. Thus, if the patient has normal blood pressure- the aspiration occurs very seldom by using non-aspirating cartridges.

Anesthesia, Dental↗
PubMed1977

Aspiration in local anesthesis. Comparison between disposable self-aspirating and usual syringes.

The positive aspirations obtained with a self-aspirating syringe (Astra, Sweden) were compared with those obtained when aspiration was performed manually (Uniject syringe, Hoechst, West Germany). The subjects were 1186 army recruits, to whom 2348 injections of local anesthetic were given in connection with dental treatment. When aspiration was performed manually, the results were positive in 4.7% of the cases; with the self-aspirating syringe, they were positive in 1.1% of the cases. The total frequency of positive aspirations was significantly higher (P less than 0.001) with the manual aspiration technique than with the self-aspirating syringe was due to the fact that the value did not include aspiration occurring when the injection needle ruptured small blood vessels.

Adolescent↗
PubMed1975

Analgesic effect of apernyl and phenol-camphor solutions on alveolitis.

Phenol-camphor or Apernyl were applied in 82 patients in whom alveolitis had been diagnosed. The effect of the drugs was recorded during the following days according to the patients' subjective judgment. The analgesic effect of Apernyl was significantly better than that of phenol-camphor. The treatment with phenol-camphor took an average of 1.8 days longer than that with Apernyl.

Anesthesia, Dental↗