Abstract
I investigated the existence and location of cleft alveolus, teeth absence, dwarfed teeth, and supernumerary teeth in 103 patients with unilateral cleft lip and/or alveolus treated by the Second Department of Oral and Maxillofacial Surgery, School of Dentistry, Aichi Gakuin University.The results obtained were as follows:1. The subjects included 54males (unilateral cleft lip without cleft alveolus 25; unilateral cleft lip with cleft alvelus 29) and 49 females (unilateral cleft lip without cleft alveolus 14; unilateral cleft lip with cleft alveolus 35).2. The incidences of absent teeth on the cleft side and non-cleft side in the cleft lip group were 2.6% and 2.6%, respectively, whereas those on the cleft side and non-cleft side in the cleft alveolus group were 40.6% and 4.7%, respectively. The absence or presence of cleft alveolus was suggested to be a major factor.3. The incidences of dwarfed teeth on the cleft side and non-cleft side in the cleft lip group were 15.4% and 2.6% respectively, whereas that on the cleft side in the cleft alveolus group was 4.7%. No dwarfed teeth were observed on the non-cleft side in the cleft alveolus group, which suggested the involvement of clefting. The low incidence of dwarfed teeth in cleft lip and alveolus indicated that clefting may eliminate the occurence of dwarfed teeth.4. The incidences of supernumerary teeth were 20.5% and 5.1% on the cleft side and non-cleft side in the cleft lip group, whereas that on the cleft side in the cleft alveolus group was 4.7%. No supernumerary teeth were observed on the non-cleft side in the cleft alveolus group, which suggested the involvement of clefting. The incidence of supernumerary teeth in cleft alveolus indicated that clefting may eliminate the occurence of supernumerary teeth.5. The location of clefting was 1∇3 (39.1%), 1∇23 (32.8%), 12∇3 (23.4%), 12∇2'3 (4.7%).6. Studies of the location of clefting and tooth abnormalities on the cleft side confirmed that the medial nasal process and the maxillary process can give rise to the lateral incisors.
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