Chohayeb13 investigated the dilaceration pattern of 480 maxillary lateral incisors and found that more than half of the samples showed a dilaceration in a distolabial
direction, and palatal dilacerations of the apical third of the root apex were observed in only 10.4% of the study samples.
Gingival recession of about 0.5 mm was presented at the distolabial
aspect of the left lateral incisor, resulting in gingival level disharmony (Figure 1(b)).
A short distolabial
crista at the hypoconid is absent.
Cusp 6 occasionally appears between distolabial
and distolingual cusps of first and second lower molars, while cusp 7 is usually located at the marginal edge between distolingual and mesolingual cusps of the same teeth.
Periodontal examination consisted of measuring pockets at six regions of teeth ie, mesiolabial, midlabial, distolabial
, mesiopalatal, midpalatal and distopalatal using UNC-15 probe.
During the formation of the anterior occlusion, physiologic movement of the maxillary and mandibular canines in a distolabial
direction occurs [Rapp and Demiroz, 1983].
Briefly, 5 sterile paper strips (Periopaper) were gently inserted into the mesiolabial or distolabial
gingival sulcus between the upper anterior teeth within 2 mm.