Studying Orthodontic Tooth Movement in Mice

The first objective of this research is to analyze maxillary bone remodeling and then for resorption in response to pharmacological stimuli or the use of transgenic This study aims to pave the way for future therapeutic strategies to modulate bone loss associated with bone remodeling. Recent advancements include analysis of molecular design to prevent or treat the loss of bone mass mortality. This innovation has set to improve dental treatments, involved structures such as orthodontics and dental implants.

The technologies currently employed to advance research in our field include the use of genetically modified animals, computerizing macro tomography analysis, advancements in spring technology, and developments in materials for tooth descriptors The primary experimental challenge lies in acquiring the manual skills necessary to fabricate springs in precisely adhere them to the upper right first molar of mice. This procedure is conducted in anesthesia with the mice position in a surgical table and aided by microscopy for accuracy. Estrogen deficiency as observed in osteoporosis has been associated with increased maxillary bone remodeling.

Future research could investigate the potential of molecules like phosphate kinase and dioxygenase 1, as therapies targeting osteoclastic enzymes. This is strategies aim to enhance osteo protection under conditions of mechanical stress. To begin, use distal cut pliers to cut the 0.25 by 0.76 inches nickel titanium open coil spring into six loops, with two loop shaped ends positioned perpendicular to the spring, using orthodontic Weingart pliers.

Shape the 0.20 millimeter diameter round chrome nickel wire to the desired configuration with loop shaped ends using Matthew tweezers and a round shaped instrument as a size reference. Put together the loop shaped ends of the coil and the 0.20 millimeter round chrome nickel wire. After anesthetizing the mouse, evaluate the depth of anesthesia using the pedal reflex.

Position the mouse in a dorsal decubitus position on a surgical table, immobilizing its limbs to restrict movement and enable intra-oral access. Utilize a mouth opener, fashioned from a 0.50 millimeter diameter wire and secured with a 0.08 millimeter wire to facilitate full visualization while preventing head movement. Under a stereo microscope, observe the intra-oral structures.

Clean and etch the right first molar and incisor surfaces using acetone and a self-etching primer, respectively. Using a micro brush, collect a small amount of self-etching primer. And apply it to the occlusal surface of the upper first molar.

Light-cure the primer at the occlusal surface of molars and incisors for 30 seconds. Using light-cured resin, bond the distal end of a six loop nickel titanium open coil spring to the occlusal surface of the right first maxillary molar. And light-cure for 30 seconds.

Activate the coil using a specially designed apparatus with a rail and crank mechanism attached to the surgical table. Connect the free loop shaped end of the 0.20 millimeter round wire to the hook of the tension gauge. Upon activation of the crank, move the surgical table along the rail until the dynamometer registers a force of 0.35 newton.

Bond the 0.20 millimeter round wire to both upper incisors, to anchor the coil. Cut the wire to detach the mouse from the dynamometer. Add another increment of resin so the metal edge of the device is not exposed and hurts the mouse.

And light-cure for 30 seconds. Disassemble the mouse from the table. After surgery treat the mouse with saline solution to avoid dehydration during the adaptation period with the device.

To begin, harvest the maxillary bone from the euthanized mouse with sharp scissors by cutting all soft tissue. The zygomatic bone in the sagittal plane and the fronton nasal suture and spheno occipital synchondrosis in the coronal plane. Fix the maxillary bone in 10%neutral buffered formalin for 48 hours.

To perform micro CT scanning of the maxillary bone, use an isotropic voxel size of 9 to 18 micrometers, X-ray settings of 50 kilovolts, 0.5 millimeter aluminum filter and rotation angle of 0.5 degrees for high resolution scans. Reconstruct the acquired images using the micro tomography reconstruction program indicated by the manufacturer of the micro CT used. To quantify orthodontic tooth movement, measure the difference in linear distance between the cement enamel junction of the first and second molars of the right hemi maxilla relative to the left hemi maxilla.

To check the samples for the presence of orthodontic induced inflammatory root resorption, using the manual contouring method, select the region of interest of the distovestibular root of the first maxillary molar. Measure the root mineral density and percentage of root volume per total volume. Investigation of an orthodontic tooth movement mouse model with a force of 0.35 newton applied, demonstrated that the mean cement enamel junction distance on the control side between the first and second molars was 243.69 micrometers.

On the orthodontic tooth movement side, the mean cement enamel junction distance was 284.66 micrometers.