Orthodontic Diagnosis & Treatment Planning
Marcello M. | August 12, 2026
Orthodontic Reference Books Series – Part 1/3
Introduction
Orthodontic treatment planning is one of the most important steps in clinical orthodontics. A successful treatment does not begin with the selection of an appliance or a bracket system. It begins with a comprehensive understanding of the patient's skeletal, dental, soft-tissue, functional, and psychosocial characteristics.
The principles presented in Contemporary Orthodontics emphasize an evidence-based and biologically oriented approach to diagnosis and treatment. The seventh edition continues this framework by addressing growth and development, orthodontic diagnosis, treatment planning, biomechanics, contemporary appliances, and the management of malocclusion and dentofacial deformity.
1. Diagnosis Before Treatment
Orthodontic diagnosis should be considered a process rather than a single measurement. The clinician must integrate information obtained from the clinical examination, photographs, dental casts or digital models, radiographic evaluation, and the patient's medical and dental history.
The objective is not simply to describe the malocclusion. The diagnosis should explain why the malocclusion exists, identify the components that require correction, and determine which characteristics may influence treatment prognosis and stability.
2. Establishing the Orthodontic Problem List
A useful approach is to organize the diagnosis into several major categories:
- Skeletal relationships
- Dental relationships
- Arch form and tooth alignment
- Transverse discrepancies
- Vertical relationships
- Anteroposterior relationships
- Facial and soft-tissue characteristics
- Functional considerations
- Airway and related clinical considerations when indicated
- Growth potential and developmental status
This structured approach helps prevent the clinician from focusing exclusively on dental alignment while overlooking the underlying skeletal or facial problem.
3. Growth and Development
Growth assessment is particularly important in growing patients. Orthodontic treatment may take advantage of remaining growth when the clinical problem has a significant skeletal component.
However, growth should not be considered a predictable treatment tool. Individual variation in timing, magnitude, and direction of growth means that treatment decisions must be based on the patient's developmental status and clinical characteristics rather than chronological age alone.
Understanding facial growth also helps the orthodontist anticipate how the patient's facial proportions and occlusion may change during and after treatment.
4. From Diagnosis to Treatment Objectives
Once the problem list has been established, the clinician should define specific treatment objectives.
These objectives should answer several fundamental questions:
- What should be corrected?
- What can realistically be corrected?
- Which structures should be moved?
- What limitations are imposed by the patient's biology?
- What compromises may be necessary?
- How will treatment affect facial aesthetics and function?
- How can the result be maintained over time?
Treatment planning therefore represents a balance between the ideal orthodontic result and what is biologically, mechanically, aesthetically, and clinically achievable.
5. The Importance of Biomechanics
Diagnosis and treatment planning cannot be separated from biomechanics. Every planned tooth movement requires an appropriate force system, adequate anchorage, and sufficient biological response.
A treatment plan that appears ideal on a diagnostic model may become unrealistic if the required tooth movements cannot be achieved predictably with the available biomechanics.
For this reason, treatment planning should anticipate anchorage requirements, unwanted movements, root control, vertical effects, and the interaction between individual tooth movements.
6. Extraction Versus Non-Extraction Treatment
One of the most frequently discussed decisions in orthodontics is whether treatment should involve extraction of permanent teeth.
This decision should not be based solely on crowding. Arch dimensions, incisor position, facial profile, soft-tissue characteristics, skeletal relationships, periodontal considerations, and treatment objectives must all be considered.
The central question is not simply whether teeth can be aligned without extraction, but whether the proposed treatment will produce an acceptable and stable result while respecting the biological and facial limitations of the patient.
7. Digital Orthodontics and Contemporary Treatment Planning
Modern orthodontics increasingly integrates digital models, intraoral scanning, three-dimensional imaging, virtual setups, and computer-assisted treatment planning.
These technologies can improve visualization and communication, but digital simulation should not be confused with biological prediction. A virtual treatment plan represents a proposed mechanical sequence; the actual clinical response remains influenced by biology, patient compliance, biomechanics, and treatment execution.
The seventh edition of Contemporary Orthodontics also incorporates newer developments such as artificial intelligence, clear tray aligners, and technology applied to orthognathic surgery planning.
8. Clinical Decision-Making
A strong orthodontic treatment plan should therefore integrate four fundamental elements:
- Diagnosis: identify and understand the malocclusion.
- Objectives: define the desired clinical outcome.
- Mechanics: determine how the objectives can be achieved.
- Stability: anticipate the factors that may compromise the result.
This framework allows orthodontists to move beyond appliance-driven treatment and toward individualized clinical decision-making.
Clinical Relevance
The most important lesson from the contemporary orthodontic approach is that appliances should follow diagnosis—not the opposite.
Brackets, aligners, functional appliances, skeletal anchorage, and surgical approaches are tools. Their effectiveness depends on selecting the appropriate tool for the biological and clinical problem.
A comprehensive diagnosis therefore remains the foundation of predictable orthodontic treatment, regardless of whether the treatment is performed using conventional fixed appliances or modern digital techniques.
Key Clinical Points
- Orthodontic treatment should begin with diagnosis rather than appliance selection.
- A comprehensive problem list is essential for treatment planning.
- Growth and development can influence treatment timing and possibilities.
- Facial aesthetics should be considered alongside dental alignment.
- Biomechanical feasibility must be assessed before finalizing treatment objectives.
- Digital simulations support treatment planning but cannot completely predict biological response.
- Long-term stability should be considered from the beginning of treatment.
Conclusion
Orthodontic diagnosis and treatment planning require the integration of skeletal, dental, facial, functional, biological, and developmental information. The contemporary orthodontic philosophy emphasizes individualized treatment rather than a one-size-fits-all approach.
The fundamental principle remains simple: diagnose first, establish realistic objectives, select the appropriate biomechanics, and plan for stability.
Reference Book
Fields HW Jr, Larson BE, Sarver DM, Proffit WR. Contemporary Orthodontics. 7th ed. St. Louis, MO: Mosby/Elsevier; 2025. ISBN: 978-0-323-93071-0.
The seventh edition is the current English edition and was published in 2025.