American Journal of Orthodontics and Dentofacial Orthopedics

The purpose of this study was to analyze and clarify tooth movement when intruding the maxillary molars using intrusive forces between the maxillary first and second molars. A finite element method was used to simulate the long-term orthodontic movement of the maxillary dentition by accumulating the initial displacement of teeth produced by elastic deformation of the periodontal ligament. Intrusive forces of 2 N were applied buccally to the archwire between the maxillary first and second molars.

Highlights • The application of microosteoperforations (MOPs) is not more effective than conventional method. • The alignment rate in the MOPs group increased by average 4 days only. • Repetition of the MOPs monthly does not enhance the alignment improvement. • The level of initial Little's irregularity index affects the length of alignment duration. • The higher the initial irregularity, the longer the alignment duration may be undertaken.

Highlights • The viscoelastic model may mimic long-term displacements from orthopedic appliances. • The viscoelastic model showed low, relaxed strains over time that appear clinically relevant. • The model showed a 3.1 mm forward downward chin displacement after 6 months of Herbst appliance use. Introduction As a powerful numerical approximation tool, finite element analysis (FEA) has been widely used to predict stress and strain distributions in facial bones generated by orthodontic appliances.

Highlights • Deviated nasal septum and turbinate hypertrophy were assessed in children using CBCT. • Findings from CBCT scans were correlated with risk for obstructive sleep apnea. • Neither septum deviation nor turbinate hypertrophy correlated with high risk for obstructive sleep apnea. • CBCT can be used in conjunction with a medical history and clinical assessment.

Highlights • Finite element analysis is an advanced and precise tool in biomechanical research. • The pattern of occlusal load distribution reflects the functional morphology. • And prevents local bone damage caused by excess masticatory load and orthodontic forces. • Mesial displacements of the molars weaken the role of the pterygoid stress trajectory. • Dehiscence and fenestration can occur if the bone does not adapt physiologically to the local stress.

Highlights • Maxillary canine distalization was compared between OrthoPulse and control sides. • Orthodontic tooth movement was similar in OrthoPulse and control sides. • Canine rotations and anchorage loss were similar on both sides. Introduction This split-mouth trial aimed to examine the effects of light-emitting diode (LED)–mediated photobiomodulation compared with no photobiomodulation on maxillary canine distalization.

Highlights • 3-dimensional animation is as effective as the written plus verbal in transferring knowledge. • The use of a 3-dimensional animated video reduces clinical chairside time. • Patients do not recall the risk of root resorption during orthodontic treatment.