Use of the dynamic volume spline method to predict facial soft tissue changes associated with orthognathic surgery

Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2010 Nov;110(5):e17-23. doi: 10.1016/j.tripleo.2010.06.004.

Abstract

Objective: The shape of the face can be estimated before the surgery by using 3-dimensional computer programs that provide tools to guide skill modifications. The aim of this study was to present the dynamic volume spline method to predict facial soft tissue changes after the modification of the skull associated with orthognathic surgery.

Study design: Soft tissue volume is modeled by a dynamic volume spline that includes the elastic behavior of the actual tissue. The model is a hybrid of spring-mass model and finite element model, and combines their advantageous properties. It provides fast and realistic soft tissue simulations. Postsurgical shape of the patient's face is estimated by reshaping the skull and letting the soft tissue model relax over the new boundary conditions formed by the new skull shape. Postsurgical estimations were compared with the conventional method's estimations, where the soft tissue is not modeled biomechanically. Also, postsurgical estimations were compared with the actual postsurgical data for 6 orthognathic surgery patients.

Results: The mean of the error between the estimated shapes and the actual postsurgical shapes was ∼1.8 mm when the whole face was considered.

Conclusion: When the facial soft tissue is modeled by the dynamic volume spline, the postsurgical shape is estimated better than by the conventional method and previous methods in the literature.

Publication types

  • Comparative Study

MeSH terms

  • Algorithms
  • Biomechanical Phenomena
  • Cephalometry / methods*
  • Cephalometry / statistics & numerical data
  • Computer Simulation
  • Elastic Modulus
  • Elasticity
  • Esthetics
  • Face / anatomy & histology*
  • Female
  • Finite Element Analysis
  • Forecasting
  • Humans
  • Image Processing, Computer-Assisted / methods*
  • Image Processing, Computer-Assisted / statistics & numerical data
  • Imaging, Three-Dimensional / methods*
  • Imaging, Three-Dimensional / statistics & numerical data
  • Male
  • Malocclusion, Angle Class II / surgery
  • Mandible / surgery
  • Maxilla / surgery
  • Models, Biological
  • Orthognathic Surgical Procedures / methods*
  • Osteotomy / methods
  • Osteotomy, Le Fort / methods
  • Patient Care Planning
  • Skin Physiological Phenomena
  • Stress, Mechanical
  • User-Computer Interface
  • Young Adult