For each Class III case, it is necessary to set a PIP as a treatment goal which will result in the upper incisors having correct antero-posterior and vertical positioning, with appropriate torque (Fig. 8.17). It is beyond the scope of this text to discuss and define precise goals. However, each orthodontist will have a view about where the upper incisor should be placed, and there should be broad consensus in most cases. As with Class II cases, before reaching a decision about a suitable goal, it is first necessary to analyze the existing position of the incisors, using either conventional cephalometry or the Arnett analysis. The components are as described for Class II cases (p. 168). The same approach and values should be used when analyzing the pre-treatment upper incisor position for Class III cases.
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