Stacks Image 31
Stacks Image 325


Chris Chang

Stacks Image 368
Chris Chang

Dr. Chris Chang received his PhD in bone physiology and Certificate in Orthodontics from Indiana University in 1996 and is a Diplomate of American Board of Orthodontics. He is the author of Jobsology, co-author of Orthodontics Vol I-IV, Clinical Implant Dentistry I-II, and publisher of International Journal of Orthodontics and Implantology. 

Dr. Chang frequently lectures worldwide on non-surgical orthodontic treatment, implant-orthodontic combined treatment and effective presentations. In addition to teaching and publishing, he also founded Newton’s A, Inc. and Beethoven Orthodontic Group, based in Hsinchu, Taiwan. 

He has been actively involved in the design of orthodontic bone screws and application on impaction treatment. His latest focus is implant and orthodontic combined treatment.


3 Small Screws And Impaction

Temporary anchorage devices(TADs) have proven to be extremely reliable and effective in impaction treatment in various positions and many other skeletal malocclusions.
Buccal shelve screws are particularly useful in the camouflage treatment of severe Class III treatment and lower anterior impaction, Ramus screws are ideal in uncovering lower deep horizontal impaction. IZC screws are recommended in the correction of Class II, upper anterior impaction and protrusion.
Detailed biomechanics analysis and treatment protocols will be discussed in dealing with these challenging clinical scenarios.