Overjet
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| Overjet | |
|---|---|
| Synonyms | Horizontal overlap |
| Pronounce | N/A |
| Specialty | N/A |
| Symptoms | Protrusion of the upper teeth |
| Complications | Tooth wear, jaw pain, speech difficulties |
| Onset | Childhood |
| Duration | Long-term |
| Types | N/A |
| Causes | Genetics, thumb sucking, tongue thrusting |
| Risks | Malocclusion, dental trauma |
| Diagnosis | Dental examination, cephalometric analysis |
| Differential diagnosis | Overbite, crossbite |
| Prevention | Early orthodontic treatment, cessation of habits like thumb sucking |
| Treatment | Braces, orthodontic appliances, jaw surgery |
| Medication | N/A |
| Prognosis | Good with treatment |
| Frequency | Common |
| Deaths | N/A |
Overjet refers to the horizontal distance between the upper front teeth (maxillary incisors) and the lower front teeth (mandibular incisors). It is a common dental measurement used to assess the alignment and occlusion of teeth.
Definition[edit]
In dental terms, overjet is the extent of horizontal (anterior-posterior) overlap of the maxillary central incisors over the mandibular central incisors. It is typically measured in millimeters using a periodontal probe or a ruler.
Normal Overjet[edit]
A normal overjet is considered to be around 2 to 3 millimeters. This allows for proper function and aesthetics of the teeth. A normal overjet ensures that the teeth can effectively cut and chew food, and it also contributes to the overall appearance of the smile.
Increased Overjet[edit]
An increased overjet, often referred to as "protrusion," occurs when the maxillary incisors are significantly forward of the mandibular incisors. This condition can be caused by:
Increased overjet can lead to functional problems such as difficulty in biting and increased risk of trauma to the protruded teeth.
Decreased Overjet[edit]
A decreased overjet, sometimes called "reverse overjet" or "anterior crossbite," occurs when the mandibular incisors are positioned in front of the maxillary incisors. This condition can be associated with:
Decreased overjet can affect the aesthetics of the smile and may lead to functional issues such as improper incisal guidance.
Clinical Significance[edit]
Assessing overjet is crucial in orthodontic diagnosis and treatment planning. It helps in determining the type of malocclusion and the appropriate treatment approach, which may include:
