Biomedical subjects

E Klemetti

Publications and source records attributed to E Klemetti.

25 records · Page 2Linked to original sources

PubMed1994

Pantomography in assessment of the osteoporosis risk group.

The diagnostic efficacies of three panoramic-based indices were compared with classification of bone mineral density by dual-energy x-ray absorptiometry. The panoramic indices were 1) cortical bone height, 2) an ordinal classification, and 3) the Panoramic Mandibular Index. The results indicate that panoramic dental radiographs should not be used to assess the patient's status regarding osteoporosis, although the means of the variables in different mineral density groups of skeleton may differ significantly.

Absorptiometry, Photon↗

PubMed1994

Effect of maxillary edentulousness on mandibular residual ridges.

Bone mineral density (BMD) was measured in five different regions of the mandible of 77 postmenopausal women. These women were also classified according to the remaining, clinically determined alveolar height in the edentulous distal regions of the mandible. The duration of edentulousness in the maxilla and in the mandible was determined anamnestically. All subjects were edentulous in the maxilla, and 42 were also edentulous in the mandible. The other 35 women had teeth only in region d35-d45. This study shows that after extraction of the last teeth in the mandible, the BMD of the cortical bone is not lowered, but that the BMD of the trabecular portion is lowered more by mechanical stress caused by the remaining natural teeth than by maxillary dentures. This feature becomes apparent when duration of edentulousness in the maxilla is compared with the BMD values of different regions in the mandible.

Alveolar Process↗

PubMed1994

Muscle strength and mineral densities in the mandible.

Bone mineral density (BMD) in the femoral neck and lumbar spine was measured for 355 postmenopausal 48- to 56-year-old women and the BMD in five different regions in the mandible for 77. All 355 women were also classified according to the size of the masseter muscle. Both skeletal measures and the BMD of the buccal cortex distally from the foramen mentale were compared with the size of the masseter muscle. This study indicates that functional stress, caused by the masseter muscle, is involved in maintaining bone mineral density in edentulous regions of the mandible. Those individuals who are physically active or are bruxists may lose less mineral, after extractions of teeth, from those regions of the jaw bones where the muscles are attached.

Absorptiometry, Photon↗

PubMed1993

Effect of bone mineral density in skeleton and mandible on extraction of teeth and clinical alveolar height.

Residual ridge resorption of the maxillae and mandible after tooth extraction adversely affects many edentulous people. The jaws of 355 postmenopausal women were examined clinically, and the number of teeth and the clinical height of alveolar ridges in edentulous jaws were determined. Each subject was asked when the last teeth had been extracted. To study the bone mineral status of each woman, the bone mineral densities of the femoral neck and the lumbar spine were measured by dual-energy x-ray absorptiometry. For 77 edentulous or almost edentulous women, the bone mineral density of the mandibular cortex and the spongiosa were measured by quantitative computed tomography. The results were studied to determine whether the general status of osteoporosis or the local bone mineral densities in the mandible affect the time of extraction of teeth or the remaining height of edentulous alveolar ridges. Neither the time when the teeth were lost nor the number of teeth was dependent on the general bone loss, but in some regions, the clinical height was affected.

Alveolar Process↗

PubMed1993

Panoramic mandibular index and bone mineral densities in postmenopausal women.

The panoramic mandibular index was used in a group of postmenopausal women to determine whether it correlates with bone mineral densities of the femoral neck, lumbar area, and the trabecular and cortical parts of the mandible. The bone mineral density values were measured by dual-energy x-ray absorptiometry of the femoral neck and lumbar area and by quantitative computed tomography of the mandible. Linear correlation of the panoramic mandibular index with all bone mineral density values was weak. However, the low and high index subgroup means were clearly dependent on the bone mineral density variables.

Bone Density↗

PubMed1993

Cortical bone mineral density in the mandible and osteoporosis status in postmenopausal women.

Mineral density of the cortical bone of the mandible was determined by single-energy QCT (quantitative computed tomography) for 77 menopausal women. Bone mineral densities (BMD) were measured in the buccal and lingual layers of the cortex, distally from the foramen mentale, on both sides of the mandible. All the women were edentulous in that region, and the alveolar processes were far resorbed. These results were compared with the BMD values of the femoral neck, lumbar spine, and trabecular portion of the mandible between the detected layers of cortex. The BMD of the buccal cortex correlated remarkably well with all values, except those of the trabecular portion. Of the women tested, the correlations were lowest in the least osteoporotic group. The values for the lingual cortex did not correlate with other variables as well as did those for the buccal cortex, but in the most osteoporotic part of the sample the lingual cortex values correlated significantly with the BMD of the trabecular portion. The BMD values for the buccal cortex were significantly higher than those for the lingual cortex.

Absorptiometry, Photon↗

PubMed1993

Trabecular bone mineral density of mandible and alveolar height in postmenopausal women.

Mineral density of the trabecular bone of the mandible was determined by single-energy QCT (quantitative computed tomography) for 74 totally or nearly edentulous menopausal women. These results were compared with the bone mineral densities (BMD) of their lumbar area (L2-L4) and femoral collum, measured by dual-energy x-ray transmission, Lunar DPX. The remaining height of the residual ridge at the symphysis of the mandible was measured on computed tomography (CT) lateral projection view, and an index of the residual ridge status was introduced. To determine whether general osteoporosis status affects the remaining height of the residual ridges, we compared these values with all results for bone mineral density. The BMD of the lumbar area and that of the femoral collum correlated well with each other, but the BMD of the trabecular bone of the mandible did not correlate with either of the other two BMD measurements. Measurements of residual ridge height did not correlate with any BMD values. The effect of possible bone loss earlier in life is no longer apparent in mandibular height or trabecular BMD over 20 yr after tooth extractions.

Absorptiometry, Photon↗