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SMILE ANALYSIS

  •                    INTRODUCTION
  •                                Dale Carnegie  said that one of the most important ways to win friends and influence people is to smile.
  •                          “The goal of orthodontic treatment should be the attainment of the best possible esthetic result, dentally and facially.”                                   -Wylie
  •                           Epker and Fish stated that, “Perhaps the single most important feature in evaluating facial esthetics is the relation of the lips to one another and to the teeth”.
  •      Smile analysis and smile design have become key elements of orthodontic diagnosis and treatment planning . Recent advances in technology now permit the clinician to measure dynamic lip-tooth relationships and incorporate that information into the orthodontic problem list and biomechanical plan.

 

  • MUSCULAR BASIS OF THE SMILE
  • Work by Rubin, Mishriki and Lee has elucidated the anatomic mechanism producing the open smile. As a result of extensive cadaver dissections, Rubin and his colleagues have identified the nasolabial fold as the keystone of the smiling mechanism.
  • The smile is formed in two stages
  • The first stage raises the upper lip to the nasolabial fold by contraction of the levator muscles originating in the fold and inserting at the upper lip. The medial muscle bundles raise the lip at the anterior teeth and the lateral muscle groups raise the lip at the posterior teeth. The lip then meets resistance at the nasolabial fold because of cheek fat.

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