6Oehlers F. The tuberculated premolar[J]. Dent Prac Dent Rec, 1956,6(5) :144-148.
7Hill FJ, Bellis WJ. Dens evaginatus and its management[J]. Br Dent J, 1984,156(1 ) : 400-402.
8Tsurumachi T, Suguro H, Ogata H, et al. Endodontic treat- ment of bilateral dens evaginatus premolars with large periapieal lesions[J]. J Oral Sei, 2009,51 (3) : 475-479.
