Acceleration of Lower Anterior Teeth Leveling and Alignment Using Corticision

Crowding is the most common form of malocclusion. Different methods have been used to resolve crowding, including extraction and nonextraction. Corticision is an important methods to accelerate tooth movement in crowded cases. Cortical bone incision without flap elevation enhances turnover rate of surrounding structures and decreases the time for leveling and alignment. In orthodontics, CBCT imaging has been applied to evaluate impacted teeth and root resorption. But the data are very rare regarding the application of CBCT in tooth movement. So CBCT will be used in this research to evaluate the amount of external apical root resorption (EARR) and presence of dehiscence in the lower anterior teeth in the crowded cases. Furthermore, the duration of alignment will be compared between corticision group and non-corticision group.

Inclusion criteria

• patients age 18 years or more
• complete permanent dentition with second molars
• crowding of less than 6 mm
• good healthy patients without systematic diseases
• absence of spaces in the lower dental arch
• orthodontic treatment protocol does not required extraoral appliances, intraoral elastics, and expansion during leveling and alignment in the lower arch
• good oral hygiene
• absence of periodontal lesion

Exclusion criteria

• patients with syndromes, clefts, or craniofacial abnormalities or systematic diseases
• poor oral hygiene or periodontal lesion
• previous orthodontic treatment.
• Inability for brackets bonding in lower anterior teeth
• presence of extreme skeletal discrepancy in vertical , transverse and anteroposterior relations
• Delay rebonding of any loosing brackets for more than one week in the lower anterior teeth