Begg treatment of high-angle cases

Abstract

Customarily, the prediction of vertical or horizontal facial growth style has been correlated with the inclination of the mandibular plane. A three-way association between high-angle cases, an unfavorable vertical. growth style, and difficult treatment has long been an accepted doctrine. This is an unfortunate assumption. It holds true in only a limited number of high-angle cases, since a high-angle has very little correlation with the style of growth. Moreover, the unfavorable vertical style of growth and the stubborn treatment response are not the exclusive domain of high-angle cases. Mediumand even low-angle cases can occasionally exhibit the unfavorable vertical style of growth and stubborn treatment response (Fig. 5). Having suggested that the growth styles of high-angle cases are probably not unique, the next consideration is what constitutes a high-angle case. Maynel designates the normal Frankfort-mandibular angle (FMA) range as being between 9 and 40 degrees, with anything over 40 degrees to be considered a high-angle cases. Bushra2 defines normal range as being between 16 and 39 degrees, with anything over 39 degrees considered a high-angle case. Root3 designates anything over 30 degrees as a high-angle case, and Lindquist4 does the same. Downs” holds the normal range of FMA to be between