Craniometry and Functional Craniology

Craniometry and Functional Craniology

Presentation by:
Michael S. Yuan, DDS, MA, PhD

Assistant Professor of Clinical Dentistry
Division of Orthodontics
School of Dental and Oral Surgery
Columbia University

Functional Craniology: Kinematics and Dynamics


Lecture outline

1. Introduction: definition, scope, and objectives
2. Kinematics and dynamics
3. Biomechanics: forces, deformation, stresses, strains
4. Form and Function
5. Bone remodeling and growth directions
6. Moss’ Hypothesis: Functional Matrix Hypothesis
7. Clinical applications

Functional Craniology


Dynamics
Kinematics
The description of measurement.
What is the true meaning of a measurement?
Force Compression, Tension, Shear, Bending, Torsion
Original status

Cranial Sutures

1. Edge-to-edge suture
* No force loading
2. Beveled suture
* Shear force [Squamosal suture]
3. Serrated suture
* Intermittent tension force
4. Beveled and serrated suture
* Intermittent tension and shear force
5. Butt-ended sutures
* Intermittent compressive force

1. Plane (gliding) joint
* Sliding motion of all directions
2. Hinge joint
* Flexion/extension

The Growth of Mandible
The Remodeling (Growth) Direction: The “V” Principle
Drift vs Displacement

Head (craniofacial complex) is a region, where a series of functions are carried out.
These functions include vision, hearing, speech, mastication, swallowing & digestion, respiration, neural integration, and others.
The successful execution of a function requires biomechanical protection and support.
Moss’ craniofacial growth theory:
Function of the craniofacial complex region is performed by the Functional Cranial Components (F.C.C).

Functional Matrix Hypothesis
Types of Functional Matrix
1. Orthodontics
2. Dentofacial Orthopedics and Orthognathic Surgery
3. Craniofacial surgery
Introduction: definition, scope, and objectives

Kinematics and dynamics
Biomechanics: forces, deformation, stresses, strains
Form and Function
Bone remodeling and growth directions
Moss’ Hypothesis: Functional Matrix Hypothesis
Clinical applications
References

Craniometry and Functional Craniology