title: [Geometrical analysis of operative designs in unilateral cleft lip repair].
abstract: OBJECTIVE
  To study the differences in geometric principle in cleft lip repair between Millard and Tennison-Randall's method.
  
  
  METHODS
  The moving patterns of the peaks of cupid's bow along the cleft on both sides varied according to the operative designs respectively. On the above basis, the larger vertical distance that the peaks of cupid's bow would drop in both operative designs respectively, which were calculated under the similar clinical conditions.
  
  
  RESULTS
  It was found that the most obvious characteristic in Millard's design is to make the rotational axle on both cupid's bow peaks along the cleft drop farther away on the horizontal direction. However the Tennison-Randall's characteristic is to make the center of the rotational axle as near as possible to the cupid's bow peaks on the vertical direction.
  
  
  CONCLUSIONS
  It is concluded that Millard's design conforms to the requirement of reconstructing the lip on the physiological aspect, but Tennison-Randall's design complies more on the geometric principles, which is the reason why both methods of cleft lip repair can not be replaced by each other. And this study will make both kinds of operation designs be applied clearly and easily.
authors.affiliation: College of Stomatology, West China University of Medical Sciences.
authors.forename: B
authors.initials: B
authors.lastname: Shi
authors.forename: Q
authors.initials: Q
authors.lastname: Wang
mesh_terms: D002971:Cleft Lip / Q000601:surgery*; D006801:Humans; D008433:Mathematics; D019651:Plastic Surgery Procedures / Q000379:methods*