ABSTRACT
Objective To investigate the incidence of fetal malnutrition( FM), its affected factors and their relationship with small - for gestational - age (SGA) fetus. Methods The intrauterinal growth of fetus was evaluated by the body weight of neonates and FM was detected by clinical assessment of nutritional status ( CANS ). Results ①33 out of 204 cases were found to be FM (16% ). FM in SGA group was significantly higher than that in AGA group ( 5.9% ) (x2 = 69.9, P ＜ 0. 01 ).② When ot = 0. 05, the body weight and head circumference of neonates, the education level of mothers were included into logistic regression model, and their regression coefficient were negative. Conclusion SGA was supposed to be two of the risk factors in developing FM. Fetus with low body weight, small head circumference and not - so - well educated mother were prone to suffer from FM.
ABSTRACT
Objective: To study the influence of different inhibition conditions for center of rotation (CR) and regularity variations of CR before and after orthodontic treatment of embedded and inverted impact upper central incisor. Methods:Based on clinical findings a computer model of rolling movement was established,then computer finite element Super DrawnⅡwas applied to establish an analytic analogue computing model for calculation. Results:The deeper the crown embedded by hard tissue,the more the edgewise displacement of CR;while the crown was normally exposed,the moving locus tended toward front and upward. Conclusions: Perpendicular orthodontic force to the long axis of tooth forced point that close to the incisal margin and the partly embedded crown by the alveolar bone,especially the bone of lingual aspect are the main factors for the upward moving and erectness of the root apex. Possible subsidence of CR may be avoided by suitable early stage orthodontic treatment.