【用戶】joe極白

【年級】大一下

【評論內容】【Hint】 1、 The Maxillary first premolar may have one, two, or three roots and canals;; it most often have. If two canals are present, they are labeled buccal and palatal;; three root canals are designated mesiobuccal, distobuccal, and palatal. 2、 The palatal canal usually is slightly larger than the buccal canal. 3、 Ethnicity plays a factor in that Asian people have a higher incidence of one canal than do other ethnic groups.【出處】Cohen’s  Pathways  of  the  Pulp(10th  edition)  P.18...