Anterior teeth continue to erupt until contact is made with opposing anterior teeth (Fig. 6.1), the soft tissue of the palate (Fig. 6.2), or until the tongue inhibits their eruption (Fig. 6.3). Later, unrestricted eruption of lower second permanent molars contributes to development of the posterior part of the curve of Spee in Class II cases (Fig. 6.4).
If anterior teeth erupt with a normal amount of overjet (3-4 mm), an ideal amount of overbite (3-4 mm) is generally the result. I lowever, with Class II and Class III malocclusions, where there is increased or reversed amounts of overjet, overemption of anterior teeth can occur. The junction of this change is usually between the canines and first premolars, since the premolars and molars generally make contact with the opposing arch, inhibiting their overeruption.
Fig. 6.2 If the molar relationship is Class II, the lower incisors can erupt until they contact the palate. This can cause a steep anterior curve of Spee.
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