Anterior Open Bite

Definition
Causes
Solutions

Definition

Note: The following information pertains specifically to dentoalveolar tooth movements with clear aligners and excludes all medical, functional, developmental, and skeletal causes for open bites.

An anterior open bite is commonly characterized by the upper and lower posterior teeth making contact, while the anterior teeth do not occlude. This condition often arises during the transition from primary to permanent dentition and is considered a temporary phase of normal dentoalveolar growth and development.

Causes

The causes of anterior open bite, like many other malocclusions, can be hereditary, environmental, or a combination of both. Common contributors to open bite include:

• Thumb, finger, or pacifier sucking
• Abnormal tongue function, such as tongue thrusting, or a large tongue occupying the interdental space
• Trauma or pathology affecting one or both condyles
• Neurological disturbances and iatrogenic factors, such as extruding molars during treatment
• Airway pathology

Certain conditions, like TMJ degeneration, may present as an open bite, with factors such as onset and disease progression influencing the severity. Additionally, habits, respiration patterns, tongue size, and smile display all play roles, each being a complex topic in itself.

Solutions

In cases where an anterior open bite is identified before, during, or after clear aligner treatment, a thorough evaluation is essential to determine the underlying cause—dental, skeletal, muscular, or other. Only then can an appropriate treatment plan be devised.

Certain dental open bites may be amenable to correction with clear aligner therapy, pending a comprehensive examination and diagnosis to ascertain the etiology of the open bite.