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American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics|January 1, 1996
Soft tissue and dentoskeletal profile changes associated with maxillary expansion and protraction headgear treatmentP Ngan, U Hägg, C Yiu, et al.European Journal of Orthodontics|April 1, 1996
Treatment response to maxillary expansion and protractionP Ngan, U Hägg, C Yiu, et al.The International Journal of Adult Orthodontics and Orthognathic Surgery|January 1, 1997
Cephalometric comparisons of Chinese and Caucasian surgical Class III patientsP Ngan, U Hägg, C Yiu, et al.American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics|September 19, 1997
Timing for effective application of anteriorly directed orthopedic force to the maxillaD Merwin, P Ngan, U Hagg, et al.European Journal of Orthodontics|August 12, 1998
Cephalometric and occlusal changes following maxillary expansion and protractionP Ngan, C Yiu, A Hu, et al.American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics|October 1, 1996
Cephalometric A point changes during and after maxillary protraction and expansionS Shanker, P Ngan, D Wade, et al.Quintessence International (Berlin, Germany : 1985)|March 1, 1992
Effect of protraction headgear on Class III malocclusionP Ngan, S H Wei, U Hagg, et al.American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics|October 13, 2000
Evaluation of treatment and posttreatment changes of protraction facemask treatment using the PAR indexP Ngan, C YiuAmerican Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics|November 1, 1992
Change in mandibular growth direction by means of a Herbst appliance? A case reportU HäggQuintessence International (Berlin, Germany : 1985)|May 1, 1992
Treatment of Class II open bite in the mixed dentition with a removable functional appliance and headgearP Ngan, S Wilson, M Florman, et al.Pageof 42