TY - JOUR
T1 - Physical properties of root cementum
T2 - part 15. Analysis of elemental composition by using proton-induced x-ray and gamma-ray emissions in orthodontically induced root resorption craters of rat molar cementum after exposure to systemic fluoride
AU - Lim, Elaine
AU - Belton, David
AU - Petocz, Peter
AU - Arora, Manish
AU - Cheng, Lam L.
AU - Darendeliler, M. Ali
PY - 2011/2
Y1 - 2011/2
N2 - Introduction: Root resorption resulting from orthodontic treatment is an unpredictable adverse effect. Literature examining the potential protective influence of tooth cementum minerals against orthodontically induced inflammatory root resorption has been sparse. Fluorine could have a role in minimizing the extent and severity of resorptive lesions. The purpose of this study was to examine the elemental content of tooth cementum in orthodontically induced inflammatory root resorption lesions and the effect of systemic fluoride. Methods: Twenty 7-week-old Wistar rats were divided into 2 groups of 10 and exposed to systemic fluoride (100 ppm) or nonfluoridated drinking water for 2 weeks. Orthodontic tooth movement was implemented with a nickel-titanitum closing coil with a force of 100 g. The molars were then extracted, dissected, and prepared for cross-sectioning through the largest mesial midroot crater. The samples were mounted and scanned by using the Commonwealth Scientific and Industrial Research Organisation and the Australian Research Council's National Key for Geochemical Evolution and Metallogeny of Continents Nuclear Microprobe (Melbourne, Victoria, Australia). Analysis of variance (ANOVA) was used for statistical comparison of the elements and to determine the effect of fluoride, and unaffected tooth structure compared with root resorption craters. The Student t test was used to compare root crater lengths and depths of the fluoride vs no-fluoride groups. Results: Root resorption lesions of the group exposed to fluoride were significantly reduced in length and depth (P <0.01). The mineral content of the root resorption craters of the fluoride group had higher concentrations of fluorine and zinc (P <0.01). There was less calcium in the craters of the no-fluoride group compared with the fluoride group (P <0.05). Conclusions: Cementum quality (influenced by systemic fluoride exposure) might impact the extent of orthodontically induced resorptive defects.
AB - Introduction: Root resorption resulting from orthodontic treatment is an unpredictable adverse effect. Literature examining the potential protective influence of tooth cementum minerals against orthodontically induced inflammatory root resorption has been sparse. Fluorine could have a role in minimizing the extent and severity of resorptive lesions. The purpose of this study was to examine the elemental content of tooth cementum in orthodontically induced inflammatory root resorption lesions and the effect of systemic fluoride. Methods: Twenty 7-week-old Wistar rats were divided into 2 groups of 10 and exposed to systemic fluoride (100 ppm) or nonfluoridated drinking water for 2 weeks. Orthodontic tooth movement was implemented with a nickel-titanitum closing coil with a force of 100 g. The molars were then extracted, dissected, and prepared for cross-sectioning through the largest mesial midroot crater. The samples were mounted and scanned by using the Commonwealth Scientific and Industrial Research Organisation and the Australian Research Council's National Key for Geochemical Evolution and Metallogeny of Continents Nuclear Microprobe (Melbourne, Victoria, Australia). Analysis of variance (ANOVA) was used for statistical comparison of the elements and to determine the effect of fluoride, and unaffected tooth structure compared with root resorption craters. The Student t test was used to compare root crater lengths and depths of the fluoride vs no-fluoride groups. Results: Root resorption lesions of the group exposed to fluoride were significantly reduced in length and depth (P <0.01). The mineral content of the root resorption craters of the fluoride group had higher concentrations of fluorine and zinc (P <0.01). There was less calcium in the craters of the no-fluoride group compared with the fluoride group (P <0.05). Conclusions: Cementum quality (influenced by systemic fluoride exposure) might impact the extent of orthodontically induced resorptive defects.
UR - http://www.scopus.com/inward/record.url?scp=79551710400&partnerID=8YFLogxK
U2 - 10.1016/j.ajodo.2009.12.028
DO - 10.1016/j.ajodo.2009.12.028
M3 - Article
C2 - 21300230
AN - SCOPUS:79551710400
SN - 0889-5406
VL - 139
SP - e193-e202
JO - American Journal of Orthodontics and Dentofacial Orthopedics
JF - American Journal of Orthodontics and Dentofacial Orthopedics
IS - 2
ER -