Relationship of BMI, skeletal and mandibular density in osteopenia

Abstract

Various indexes could be used in assessing of reduction of density of bones. However value of each index could indicate, or not to indicate exact changes of systemic skeletal density. Aim of this study was to assess accuracy of representing and correlation of body mass index, lumbar and skeletal density and mandibular density of individuals with minor or moderate reduction of bone densities. Materials and method. 9 men (mean age 62.4 yrs.) and 14 women (mean age 65.1 yrs.) were examined. Body mass index (BMI), density of skeleton (g/cm3) (Lunar DPX-L, USA),and density of mandible using panoramic radiograph (Orthopantomograph 10,Siemens,Germany) and digital densitometer (DT II 05, England) were calculated for every subject. Results. Mean values amounted BMI=17.1 kg/m2, skeletal density T=-1.8, and optical density of a bodies of mandibles ρo= 0.98 U/mm2, for men. Pearson's correlation coefficient was 0.324, and Spearman's coefficient was 0.219. Mean values amounted BMI=15.7 kg/m2, skeletal density T=-2.1, and density of mandibles ρo= 0.63 U/mm2, for women. Pearson's correlation coefficient was 0.201, and Spearman's coefficient was 0.167. Conclusion. BMI, T and ρo indicated small or moderate reduction of skeletal density- osteopenic changes in all subjects. Calculated values of statistical parameters indicated small significance in correlations of indexes of density and mass of bones.

Uvod. U ispitivanju smanjivanja gustine kosti mogu se koristiti različiti indeksi, pri čemu vrednost svakog indeksa može, ali i ne mora, ukazati na značajne promene u kostima. Cilj rada jeste ispitivanje tačnosti u prikazivanju i korelacije indeksa telesne mase, gustine lumbalnih pršljenova i skeleta i gustine mandibule kod osoba sa malom ili umerenom redukcijom gustine kosti. Materijal i metod. Ispitano je 9 muškaraca (prosečna starost ispitanih 62,4 god.) i 14 žena (prosečna starost ispitanih 65,1 god.). Kod svakog ispitivanog su izmereni indeksi telesne mase (BMI), gustina skeleta (g/cm3) (Lunar DPX-L, USA) i gustina kosti donje vilice na osnovu ortopantomograma (Orthopantomograph 10, Siemens, Germany) i denzitometra (DT II 05, England). Rezultati. Kod muškaraca su prosečne vrednosti iznosile BMI=17,1 kg/m2, gustine skeleta T=-1.8, i gustine tela kostiju mandibula ρo= 0,98 U/mm2. Vrednost Pirsonovog koeficijenta korelacije je 0.324, a vrednost Spirmanovog koeficijenta je iznosila 0.219. Kod žena su prosečne vrednosti iznosile BMI=15,7 kg/m2, gustine skeleta T=-2.1, i gustine tela kostiju mandibula ρo= 0,63 U/mm2. Vrednost Pirsonovog koeficijenta korelacije je 0.201, a vrednost Spirmanovog koeficijenta je iznosila 0.167. Zaključak. Indeksi BMI, T i ρo su ukazali na umereno smanjenu gustinu kosti - ostepeniju kod svih ispitanih. Izračunate vrednosti parametara su ukazale na statistički malo značajne korelacije ispitivanih indeksa gustine i mase kosti.