With this system non contact,high accuracy and automatic measuring of micro-object is realized,also the size testing problem of micro-object is resolved in micron.

With the development of laser process technology and micro-machinery, the requirement of high accuracy, non-contact testing for micro-object is increasing.

In control group extraoral arch was applied to distalize molar and micro-implant anchorage used in experimental Group.

Objective: The purpose of this study is to establish a three-dimensional finite element model for micro-implant-bone and to analyze the influence of different direction of force and different height of thread on the biomechanical characteristics of micro-implant-bone interface.

Objective Mycoplasma genitalium, Mycoplasma hominis, Ureaplasma parvum, Ureaplasma urealyticum were detected and identified by reverse line blot hybridization (RLB) to evaluate the sensitity of the assay.