UW School of Dentistry


Diagnosis and Treatment Planning in Orthodontics

Burcu Bayirli

3 Credits / Quarter 7 (Spring, Second Year)

Course Description

Basic principles of diagnosis and treatment planning of problems encountered in dental and skeletal malocclusions.

Educational Goals

This course builds on the foundation laid by Orthodontics 520. The student will gain knowledge in the basic principles of biomechanics during orthodontic treatment, development of the occlusion and diagnosis of the different types of malocclusion. The overall goal is for the student to be able to analyze a malocclusion and make appropriate treatment decisions.


  • Provide an understanding of the basis of the Angle classification of malocclusion, and the characteristics of each classification. Recognize the general and specific factors that may contribute to the development of a malocclusion.
  • Describe changes in the dental arches that can be expected with normal growth in the jaws and the transition from primary to permanent dentition.
  • Know the normal eruption patterns of teeth and be able to recognize abnormal eruption sequences.
    Describe the mechanical principles and biological phenomenon associated with orthodontic tooth movement and outline various categories of tooth movement.
  • Provide a basic understanding of how fixed and removable appliances work.
  • Perform arch length analyses of mixed dentition and permanent dentition and explain the clinical significance of adequacy and inadequacy
  • Discuss the Bolton tooth-size analysis for defining compatibility between sizes of teeth and outline the clinical significance of tooth-size discrepancy
  • Identify anatomic landmarks in cephalometric radiographs and be able to analyze cephalometric data
    Understand orthodontic diagnosis within the antero-posterior, vertical, and transverse dimensions
    Understand the appropriate time when to star t orthodontic treatment
  • Describe the role of surgery in orthodontic treatment for non-growing individuals.

Course Outline

Lecture topics include: classification of occlusion; growth and development; development of occlusion; diagnosis and treatment, A-P and vertical and transverse; biology of orthodontic tooth movement; orthognathic surgery; embryology, including intramembraneous ossification and endochrondral ossification; perimeter arch changes and ectopic eruption; laboratory model analysis; and laboratory cephalometric radiologic analysis of various types of malocclusions.

Course Expectations

To successfully meet the requirements of this course, the student is required to attend lectures, read all required study materials, complete model analysis and cephalometric tracing exercises, satisfactorily present case and treatment plan to seminar group on assigned date and to demonstrate her/his understanding of the lectures, reading materials, and seminars through homework assignments, quizzes , a mid-term exam and a final exam.
Effective Winter Quarter 2007, completion of on-line course evaluation is a requirement of this course. Failure to comply will result in an “Incomplete” grade being assigned.

Competencies Addressed

UWSOD Competency 1: Examine a patient using contemporary diagnostic methods to evaluate the head and neck region and to reach a diagnosis of the patient’s oral and craniofacial health status.
UWSOD Competency 13: Assess the dentition to determine the need for orthodontic treatment.


  • Handouts
  • Course Website

*last updated: 2/25/2013