Part II : Orthodontic tooth movement after CBB/MSCs regenerate the bone defection in jawAfter the jew defect was repaired 2weeks , 4 weeks, and 8 weeks later, we put the orthodontic appliance between the first molar and incisors of SD rats, adding force on the appliance to move the first molar moving forward.
Along with the development of laser welding in dental alloy welding,it was gradually applied in orthodontic appliance for weld of Ni-Cr alloy,Co-Cr alloy or Titanium alloy.
Experiment in vivo72 adult male Wistar rats were randomized to either experimental group (n=60) or control group (n=12). In experimental group, an orthodontic appliance was devised to make the maxillary right first molar to move messily, 12 rats of control group were fixed with the same appliance, but no force was applied.
Results We saw that the group who are treated with fixed orthodontic appliance,namely:the group under treatment of "2x4" technique of labial bow,its effect is much superior to the group under treatment of occlusal pad removable orthodontic appliances. Meanwhile,this thesis also analyzes the characteristics of the two treatments,its adaptability.
Methods Orthodontic appliance was placed between the left maxillary first molar and maxillary central incisors of rat. Grouped according to tooth movement days of 0、1、3、5、7、10 and 14d, Collagen-Ⅰand MMP-1、TIMP-1 expression was examined with immunohistochemistry technic and image analyses at 1、3、5、7、10 and 14 days after tooth movement.
Orthodontic appliance was placed between the maxillary right first molar and maxillary central incisors of rat.Immunohistochemistry and image analyses were performed at 0,1,3,5,7,14,21,28 days after orthodontic force application.
Methods: Orthodontic appliance was placed between maxillary first molar and maxillary central incisor of adult Wistar rats. Immunohistochemistry was performed at 0,3,7,14,21,28 days.
The orthodontic appliance ("braces") loads a number of individual teeth; in the case of each tooth, the displacement which results is related to the form of the active force system transmitted from the appliance to the tooth crown.
There is an accepted clinical requirement for a luting cement that can be command set upon satisfactory placement of an orthodontic appliance onto dentition.
Three days later, all rats had the right maxillary first molar moved mesially by an orthodontic appliance.
The orthodontic appliance was placed between the right maxillary first molar and maxillary central incisors of adult SD rats to establish a rat molar movement model.
During treatment the orthodontic appliance in the lower arch relieved crowding.
By applying MBTR-1 dynamometer the deformative force of various labial arehcs and springs made of stainless steel wire and nickel- titanium wire was determined.It proved that the deformative force of nickel-titanium wire was about 1-5 times lower than that of the stainless steel wire.It also suggested that 3 reqirements should be futfilled for the orthodontists to select the suitable kind of wire during designing an orthodontic appliance,
The purpose of this study was to ob- serve the effect of EBC iontophoresis on increasing the rate of tooth movement in rabbits. 21 rabbits, in whose lower incisors the standard orthodontic appliances were placed, were divided into 3 groups at random which separately received iontophoresis of EBC, iontophe esis and injection of physiological saline at the sub-mucosal area of the lower incisors. The results showed that the animals with EBC iontophoresis obtained tooth movement rate of 4. 275 ±0. 1214 (mm)...
The purpose of this study was to ob- serve the effect of EBC iontophoresis on increasing the rate of tooth movement in rabbits. 21 rabbits, in whose lower incisors the standard orthodontic appliances were placed, were divided into 3 groups at random which separately received iontophoresis of EBC, iontophe esis and injection of physiological saline at the sub-mucosal area of the lower incisors. The results showed that the animals with EBC iontophoresis obtained tooth movement rate of 4. 275 ±0. 1214 (mm) and the animals with NaCl iontophoresis and injection were respectively 3. 337 ± 0. 4626 (mm) and 2. 178±0. 2922 (mm). The histologi-cal observation had also found the evidence of the ability of EBC to stimulate osteo-clasts in preiodontal pression side and os-teoblasts in tension. This study suggested that iontophoresis of EBC could play an important role in reconstructing the peri-odontum and speeding the tooth movement in rabbits.
This paper reported that acceleration of tooth movement can be gaind by submucosal injection of some kind of medicine. To avoid the pain caused by the injection,conventional drug administration was ameliorated in this study by adopting the method of iontophoresis rabbits were divided into 2 groups and the standard orthodontic appliances were placed in the lower incisors of all animals. The 2 groups were separately recieved submucosal iontophoresis and injection of 0. 9% Nacl which served as control. The...
This paper reported that acceleration of tooth movement can be gaind by submucosal injection of some kind of medicine. To avoid the pain caused by the injection,conventional drug administration was ameliorated in this study by adopting the method of iontophoresis rabbits were divided into 2 groups and the standard orthodontic appliances were placed in the lower incisors of all animals. The 2 groups were separately recieved submucosal iontophoresis and injection of 0. 9% Nacl which served as control. The result showed that animals with iontophoresis,in whose pe-riodontal pression side more osteoclasts were observed histologically, had gained rapider tooth movement than those with injections.
orthodontic appliance
正畸矫治器
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