Postmenopausal osteoporosis and tooth loss.

Department of Prosthodontics, Institute of Stomatology, Riga Stradins university, 20 Dzirciema str., Riga LV-1007, Latvia.
Stomatologija / issued by public institution "Odontologijos studija" ... [et al.] 01/2011; 13(3):92-5.
Source: PubMed


The aim of this study was to determine relation between tooth loss and general body bone mineral density in postmenopausal female who were seeking for prosthetic treatment.
There were included 79 women in this study (age from 49-81 years, mean age 62.9 years) with partial tooth loss. For all patients bone mineral density measurements for lumbar spine and both femoral necks by dual energy X-ray absorptiometry (Lunar DEXA DPX-NT, GE Medical Systems) were performed. Based on DEXA results patients were divided into 3 groups: normal bone density (T-score ≥-1.0), osteopenia (T-score from -1.0 till -2.5) and osteoporosis (T-score ≤-2.5). Dental investigation was performed to detect existing teeth. ANOVA analysis of variance was used to determine relationship between different variables by group. To test correlation between different values Pearson correlation was used.
The number of teeth in different bone mineral density groups is almost similar. There are no statistically significant differences between groups according the number of the all teeth present and according the number of teeth in maxilla and mandible. There is no significant correlation between the number of the teeth and DEXA readings, except there is weak correlation between the number of maxillary posterior teeth and bone mineral density in femoral neck.
There is no correlation between number of the teeth and general bone mineral density.

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Available from: Aivars Lejnieks, Dec 17, 2013
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    ABSTRACT: Abstract The precise relationship of bone quality and bone volumn between the mandible and the systemic bone remains largely unknown. The aim of the present study was to evaluate the skeletal association of the manbible in specific skeletal sites with the proximal tibia. Thirty three-month-old female Sprague-Dawley rats were randomly assigned into three treatments: a transabdominal sham operation (Sham group), an ovariectomy (OVX group), and an estriol treatment after ovariectomy (OVX-E group). Three months later, the microarchitecture of the trabecular and cortical bone was assessed by performing microcomputed tomography (microCT) of the right mandibular and the proximal tibia, as well as bone mineral density (BMD) used by motif calibration method. The mechanical properties of the left basal part of the mandible, 1mm behind the third mandibular molar and the proximal tibia were obtained using a three-point bending test. We found a correlation between alveolar bone around mandibular first molar and the proximal tibia for the bone surface area to bone volume ratio (r = 0.85, p <0.01), trabecular thickness(r = 0.85, p <0.01), and trabecular spacing(r = 0.717, p <0.05). No relationship for the above three parameters was found between alveolar bone around mandibular second or third molar with the proximal tibia. There was significant difference in BMD of the proximal tibia, but no in the mandible. Biomechanical testing demonstrated significant correlations in the basal bone below the molars of the mandible and the proximal tibia. The results indicate the positive correlation of tibial bone microstructure and the mechanical feature with specific skeletal sites of the mandible. Bone volumn evaluated by BMD and bone quality evaluated by bone micro-architecture and biomechanical properties, should together determine bone mass.
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