What does malocclusion mean?
Malocclusion is a dental term for an improper alignment of the upper and lower teeth when the jaws close. It can involve crowding, spacing, protrusion, retrusion, or an uneven bite, and it may be described using classifications such as Class I, Class II, or Class III. Malocclusion can influence chewing, speech, jaw development, and facial appearance, although its severity and consequences vary considerably. The word is most often used by dentists and orthodontists, though it is also understood in general medical contexts. Unlike the everyday phrase “crooked teeth,” malocclusion refers to the relationship between the teeth of both jaws and therefore provides a more exact description of the condition. Many cases can be assessed and treated through orthodontic care, including braces, retainers, or other appliances.
nounMalocclusion is an abnormal or improper alignment of the teeth of the upper and lower jaws when the jaws are brought together. It may involve crooked, crowded, spaced, or protruding teeth and can affect chewing, speech, or facial appearance.
- An abnormal or improper alignment of the teeth of the upper and lower jaws.
"The orthodontist recommended treatment for the patient's malocclusion."
"Her malocclusion made it difficult for the dentist to fit a normal brace."
"In severe cases, malocclusion can affect chewing and the development of the jaw."
Used when referring to multiple instances or cases of abnormal dental alignment.
"Malocclusions can affect the ability to bite and chew properly."
Malocclusion is more than crooked teeth: it is the way the upper and lower jaws fail to meet properly.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of malocclusion
Malocclusion was formed in the early 20th century from the combining form mal-, meaning “bad” or “defective,” and occlusion, a term derived from Latin occludere, meaning “to close up.” The related English words occlude, occult, and cloister also reflect the Latin root claudere, “to close.” The compound emphasizes an abnormal closure or alignment of the teeth.
Related word forms
How malocclusion is actually used
This is primarily a technical term used in dentistry, orthodontics, and some medical contexts. In general use, it is more precise than simply saying that someone has crooked teeth, because it describes the relationship between the upper and lower dental arches.
Easily confused with malocclusion
Occlusion is the normal meeting or contact of the upper and lower teeth, whereas malocclusion is an improper or abnormal alignment of those teeth.