Understanding Buccal Crossbites: What They Are and Why They Need Fixing

A buccal crossbite, also known as a Brodie bite or scissor bite, is an orthodontic condition where an upper tooth is positioned entirely outside of the lower teeth. This is the exact opposite of a traditional crossbite, where teeth are tucked inward.
When a Brodie bite occurs, all the cusps of the affected upper tooth sit completely on the outside of the opposing lower tooth, preventing them from meeting flatly when chewing.

Common Causes of a Buccal Crossbite

Orthodontic issues like a scissor bite can develop due to several factors:

Crowding: Lack of jaw space can force a tooth to erupt completely out of alignment.

Bite Misalignment: Natural discrepancies in jaw width or structural growth can create a mismatched bite.

Periodontal Disease: Gum and bone breakdown can increase tooth mobility, causing a tooth to drift outward.

Risks of Leaving a Brodie Bite UntreatedIgnoring a buccal crossbite can lead to severe long-term dental complications, including:

Abnormal Force Distribution: The bite loads mechanical chewing forces in the wrong direction, straining the tooth structure.Accelerated Gum Breakdown:

The improper alignment exacerbates gum disease and tissue recession around the misaligned tooth.Premature Tooth Loss:

Continuous trauma and localized bone degradation eventually result in losing the tooth much earlier than normal.

Treatment OptionsCorrecting a scissor bite requires professional orthodontic intervention to move the teeth back into functional alignment and safeguard your oral health:Traditional Braces:

Brackets and archwires apply continuous, strategic pressure to pull the buccal tooth inward and push lower teeth outward into a healthy position.Clear Aligners: Sequenced plastic trays can systematically correct certain crossbites by expanding or constricting specific segments of the dental arch.

Palatal Expanders or Auxiliaries: In skeletal cases, specialized appliances help reshape or narrow the upper jaw arch to properly match the lower jaw framework.Following active alignment treatment, long-term compliance with a custom orthodontic retainer is strictly required to prevent the teeth from shifting back into a crossbite. If you suspect your bite does not fit together correctly, consult an orthodontist or a dental professional to evaluate your unique dental structure.