Effects of different types of palatal lateral excisions on growth and development of maxilla and dental arch

Obiective:This study aimed to explore the effects of different types of palatal lateral excisions on the growth and deveiopment of the maxilla and dental arch.and to investigate the underlying mechanisms.Methods:A total of 1123-week-old Sprague-Dawley(SD)male rats were randomly divided into a control and 3 experimental groups:the mucoperiosteal denudation group,the mucosal flap excision group,and the periosteum excision group.In the experimental groups,bilateral mucoperiosteal,mucosal flap and periosteum were excised respectively in the lateral one half of the palate.Four rats in each group were randomly chosen for sacrifice every two weeks.The maxilla was dissected following the excision.The widths of the maxilla and dental arch were measured and the histological phenomena were investigated at different phases.At the same time.12 animals in each group were sequentially injected with calcein every two weeks.Three animals in each group,whose fluorescent labeling was used,were sacrificed for investigating bone formation at Week 8 following injection.Results:(1)Each experimental group presented the constriction of the maxilla and dental arch.The upper first molars in the experimental groups inclined medially.The mucoperiosteal denudation group showed the largest degree of effect followed by the periosteum excision group.The indices of the mucosal flap excision group,which retained the structures of the periosteum layer,had the most approximate values to the control group;(2)Different histological changes among the experimental groups were detected.The fibers penetrated into the palatal bone asSharpey's fibers in the mucoperiosteal denudation group.The pattern of bone deposition was the bundle type.Sharpey's fiberswerenotfoundinthemucosaI flapandperiosteum excisiongroups andthedepositions ofpalatalbonewerethelamellartypeasthose in the control group;(3)The rates ofbone deposition in the experimental groups decreased compared with the control group.The rates in different phases were the most approximate values to those of the control group in the mucosal flap excision group,which has the same structure of periosteum as the control group.Conclusion:There were different effects on the growth and development of the maxilla and dental arch in different typos of palatal lateral excisions.Periosteum is important for bone formation and deposition pattem.The prevention of Sharpey's fibers forming and attaching to the palatine can effectively avert the following malformation.     

Cerebrospinal fluid and plasma propofol concentration during total intravenous anaesthesia of patients undergoing elective intracranial tumor removal

INTRODUCTION The specific morphologic properties of choroidal epithelium and the existence of a cerebrospinal fluid(CSF)pathway for drug distribution to the central nervous system(CNS)suggest that the choroid plexus-CSF route may be more significant than pre-viously thought for drug delivery to the brain(Ghersi-Egea and Strazielle,2001).There is limitedl d l d-n d information about the CSF pharmacokinetics of propofol in humans(Engdahl et al.,1998;Dawid-owicz et al.,2001a).Propofol…     

Suppression of Meloidogyne javanica by antagonistic and plant growth-promoting rhizobacteria

INTRODUCTION Crops production in greenhouses is a method foreconomically maintaining a warm environment dur-ing cool seasons and to protect crops, especiallyvegetables, from unfavourable weather conditions.However, root-knot nematodes and soil borne fungigreatly affect plant growth and yield in greenhouses.Plant-growth promoting rhizobacteria (PGPR) havebeen identified as a biological control alternative topesticide use for disease suppression without negativeeffects on the user, consum…     

义务教育阶段体罚现象调查与原因分析

一、问题的提出 我国现代教育早在解放区时就要求废除体罚.建国后,教育部于1952年2月14日发出明确批示:废止对学生施行体罚或变相体罚.以后,在不同时期曾多次明令严禁体罚学生.自1985年以来,更是以立法形式在《义务教育法》、《教师法》、《未成年人保护法》等法律中做了明确规定.     

Erratum to：A 3D model for coupling dynamics analysis of high-speed train/track system

The original version of this article unfortunately contained one mistake.In p.980,the legend in Fig.15a was incorrect.The correct version of Fig.15a is given below.     

On the Continuity of the Matrix PadéOperator

Let [m/n]_f be the matrix Padé approximant (MPA, left-or righthanded) for a given matrix-valued power series f. Let T_(m,n)~n, be the operator which maps f to [m/n]_f. It is well known that in the scalar. case T_(m,n)~n satisfies a (local) Lipschitz condition if and only if [m/n]_f has a zero defect. However, in the matrix case we are confronted with the difficulty that we cannot give a definition of defect.In this paper, an explicit expression of MPA is given and a result about the continuity of the matrix Padé operator is obtained.     

STUDY ON THE COMBINED DERIVATIVE SPECTROPHOTOMETRY

Summary-The combined derivative spectrophotometry developed bythis paper is a new method, which can be used for the simultaneous determination of mtulticomponent mixture and may be allowed to improve sensitivity and accuracy of the determination remarkably. Two practical tests were carried out to verify the correctness of the theory and the results were Satisfactory.This paper also made an approach to quantitative comparison of sensitivities of different methods, and the conception of the index of relative sensitivity has been proposed.     

The impact of NiO on microstructure and electrical property of solid oxide fuel cell anode

INTRODUCTION The solid oxide fuel cell (SOFC) has attracted much attention as a promising source of electrical power generation because of its high efficiency in converting chemical energy to electrical power. De- velopment of SOFC with operating temperature of less than 800 °C has been extensively studied. SOFC has the potential to have the cost of its materials, cell fabrication, and corrosion of its stack components dramatically reduced. Gadolinia-doped ceria with the chemical fo…     

Semantics and Interpretation

本文通过语义学的发展简史,阐述了语义学与词汇、语义学与文化学等语境之间的关系,在不同的文化语言之间进行翻译时应注意的语义差别。同时,文章从另一个角度阐释了语言中常出现的多种歧义现象,表达同一语言现象在不同的文化背景下必须使用不同的表达方式。语义学作为一门新兴学科,有许多不足和有待于发展的地方,需要求语言学界进一步地开拓和发展。     

Application of least squares vector machines in modelling water vapor and carbon dioxide fluxes over a cropland

INTRODUCTION Modelling the variation in surface-atmosphericexchange of water vapor and carbon dioxide fluxesand how they are influenced by a complex combina-tion of environment variables and plant physiology iscrucial for assessing the annual water and carbonbudget for cropland. Biophysical or process-basedmodels such as soil-vegetation-atmosphere transfer(SVAT) (Franks et al., 1997; Franks and Beven, 1999Mo and Beven, 2004), Simultaneous Heat and Water(SHAW) (Flerchinger et al., 1…