(Am J Orthod Dentofacial Orthop 2016;149:253-8)
Effect of piezocision on root resorption associated with orthodontic force: A microcomputed tomography study
(Am J Orthod Dentofacial Orthop 2017;151:53-62)
Introduction: The purpose of this study was to investigate the effect of piezocision on orthodontically induced inflammatory root resorption. Methods: Fourteen patients were included in this split-mouth study; 1 side was assigned to piezocision, and the other side served as the control. Vertical corticotomy cuts of 4 to 5 mm in length were performed on either side of each piezocision premolar, and 150-g buccal tipping forces were applied to the premolars. After 4 weeks, the maxillary first premolars were extracted and scanned with microcomputed tomography. Results: There was a significantly greater total amount of root resorption seen on the piezocision sides when compared with the control sides (P 5 0.029). The piezocision procedure resulted in a 44% average increase in root resorption. In 5 patients, there was noticeable piezocision-related iatrogenic root damage. When that was combined with the orthodontic root resorption found on the piezocision-treated teeth, there was a statistically significant 110% average increase in volumetric root loss when compared with the control side (P 5 0.005). Conclusions: The piezocision procedure that initiates the regional acceleratory phenomenon may increase the iatrogenic root resorption when used in conjunction with orthodontic forces. Pie- zocision applied close to the roots may cause iatrogenic damage to the neighboring roots and should be used carefully.