Abstract
Objective: To investigate whether a low body mass index (BMI) has a significant relationship with mandibular bone porosity progression by conducting a mandibular inferior cortex (MIC) classification in elderly Japanese people. Material and Methods: A total of 266 study subjects, aged 70 at baseline, were recruited for this study, conducted from 1998 to 2007. The subjects were divided into two groups according to changes in the MIC on serial panoramic radiographs during this nine-year study period: a no change group (MIC-NC) and a change group (MIC-C). All subjects in the MIC-C showed changes trending toward greater fragility. We evaluated the BMI at baseline. Logistic regression analysis was performed to assess the relationship between the MIC condition during the nine-year period (0: MIC-NC, 1: MIC-C) and BMI (kg/m 2 ) adjusted for gender, current health status (CHS), and smoking habit (SH) at baseline . Results: The mean and standard deviations of the BMI at baseline in the MIC-NC and MIC-C were 22.8 ± 2.1 and 21.8 ± 2.5 kg/m 2 for males and 23.1 ± 2.9 and 21.9 ± 2.4 kg/m 2 for females. There was a significant relationship between the MIC condition and the BMI in both males (p=0.04) and females (p=0.01). The logistic regression analysis revealed a significant association between the MIC condition over the nine-year period and the BMI (OR=0.84, p=0.003), which was adjusted depending on the gender (OR=5.18, p=0.000), CHS (OR=0.53, p=0.015), and SH (OR=4.15, p=0.002) at baseline . Conclusion: A low BMI carries a risk of developing mandibular bone porosity by measuring the MIC condition in panoramic radiographs.
Highlights
Osteoporosis and the fractures associated with it have become public health problems worldwide.Researchers have shown that the risk of osteoporosis or fragility fractures increases with advancing age in the elderly [1]
The logistic regression analysis revealed a significant association between the mandibular inferior cortex (MIC) condition over the nine-year period and the body mass index (BMI) (OR=0.84, p=0.003), which was adjusted depending on the gender (OR=5.18, p=0.000), current health status (CHS) (OR=0.53, p=0.015), and smoking habit (SH) (OR=4.15, p=0.002) at baseline
Significant differences between males and females were observed in the MIC condition (p
Summary
Osteoporosis and the fractures associated with it have become public health problems worldwide. Researchers have shown that the risk of osteoporosis or fragility fractures increases with advancing age in the elderly [1]. One out of three women and one out of five men aged 50 or above will suffer a fragility fracture in their remaining lifetime [2]. The problem becomes more difficult to overcome because of the characteristics of osteoporosis, which can occur before any symptoms become visible. It has been suggested in several studies that many women who sustain a fragility fracture are not appropriately diagnosed and treated for probable osteoporosis [3,4]. It is necessary to investigate the risk factors for bones becoming porous to prevent fractures related to osteoporosis
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