While we are used to the terms overjet and overbite being used interchangeably, are they actually two different concerns? Our Maple Ridge dentists talk about how an overbite and overjet are different and whether or not clear aligners can help treat these conditions.
Overjets & Overbites: What is the difference?
Overbites and overjets are two of the most common orthodontic issues. Though the terms are often used interchangeably, there are distinct differences between these two conditions.
An overbite can also be referred to as a deep bite and happens when one-third of the lower incisors are covered by the upper front teeth while your jaw is in a closed position. The main distinguishing factor between overjets and overbites is that an overbite is vertical in nature and an overjet is horizontal.
Commonly called “buck teeth” an overjet is when the upper front teeth protrude over the bottom teeth, creating a significant horizontal overlap.
While it’s normal for upper front teeth to rest slightly in front of your lower teeth when closing your mouth, any space of more than 2 millimetres will cause issues.
Overbites are vertical, while overjets are horizontal and cause the upper teeth to protrude past the bottom teeth at an angle. But with an overbite, the teeth remain downward or straight (not on an angle).
What are the potential causes of overbites and overjets?
The most common cause for overbite is that the lower jaw is somewhat smaller than the upper jaw, resulting in the lower teeth resting behind the upper teeth and moving downwards as wear on your teeth takes place.
More gum will tend to show on your upper teeth, and your upper front teeth sit slightly lower than the teeth beside them (upper side teeth, or canines).
Some overbites develop as the patient is a child due to sucking frequently on objects such as soothers, bottles or even their thumb. Biting the nails or chewing on objects such as erasers or pens can also cause this issue.
Similar to overbites, childhood habits such as finger or thumb sucking can cause overjet if they persist when adult teeth begin to emerge. Another common cause is that the lower jawbone (mandible) fails to keep up with the development of the forward growth of the upper jawbone (maxillary). This disparity in growth results in the bottom jawbone (and consequently the teeth), ending up situated behind where they should be for an ideal smile.
Genetic factors can also cause overbite or overjet.
What are the issues that can come from these dental concerns?
In extreme cases of overbite, the lower teeth may touch the gum tissue behind the upper front teeth, creating wear on the teeth and gum tissue.
With an overjet, your risk of damaging your teeth or fracturing them increases. Some overjets are barely noticeable as they are moderate, while others are more severe and can make it difficult to close your lips completely due to the poor alignment of teeth. an overjet can make eating difficult as it can interfere with your bite.
Can clear aligners help treat overbites or overjets?
It may be possible for the concern to stem from skeletal issues in which case clear aligners will not be recommended. You can speak with your dentist about alternative options such as oral surgery.
However, if the overjet or overbite is caused by one of the issues listed above, we may be able to treat the problem with clear aligners. The aligners will apply gradual pressure to your teeth to move them into corrected positions as prescribed by your dentist in a custom treatment plan. This will leave you with a straighter, more symmetrical smile.
The clear aligners also move your gum at the same time, keeping proportions in check. You will need to wear your clear aligners for about 22 hours each day, removing them to brush, floss, eat and drink.
With clear aligners, your teeth will slowly shift into their desired position. To help with this you will change aligners every two weeks. Your custom treatment plan could involve wearing as many as 26 trays, which equates to one tray every two weeks for 12 months.
Before you start your treatment, your dentist will be able to show you a preview of how your new smile will look by the end of your treatment. Take the first step to schedule a consultation with your dentist to learn if you are a candidate for clear aligners.