Animal Dentistry and Oral Surgery Specialists, LLC

2409 Omro Road
Oshkosh, WI 54904-7713


Traumatic occlusion


Traumatic occlusion is a malocclusion that results in tooth on tooth or tooth on soft tissue contact.  Traumatic occlusion is somewhat common in dogs.  In cats, malocclusion is less common; however they do occur.  Tooth on soft tissue trauma can result in periodontal injury and secondary development of periodontal disease.  Tooth on soft tissue contact can result in the development of oral lesions or oral masses.


Clinical case

Trauma from the upper fourth premolar teeth striking the periodontal tissue adjacent to the lower molar teeth. 

The left upper fourth premolar (#208) was in contact with the gingiva adjacent to the lower left molar tooth (#309).  5mm of gingiva receeded and periodontal disease subsequently developed.


Dental X ray of lower left molar tooth (#309).  Note the bone loss due to periodontal disease.  This represents stage 2 or 3 of 4 periodontal disease (stages of periodontal disease)

Tooth #309 was completely extracted.



Pre-operative x-ray of the left upper fourth premolar tooth (#208).  This tooth was in contact with the gingiva adjacent to the lower left molar tooth (#309).

Fourth premolar (#208) completely extracted.


For this patient, the the traumatic occlusion was bilateral (on both sides).  The right upper fourth premolar (#108) tooth was in contact with the gingiva adjacent to the right lower molar (#409).  A 4mm gingival defect developed adjacent to #409.  Stage 2 periodontal disease was evident. 


Dental X ray of the right lower jaw (mandible) with stage 2 periodontal disease adjacent to the lower molar tooth (#409).

The right lower molar was completely extracted.



Dental radiograph of the right upper dental arch.

The right upper fourth premolar was surgically extracted to avoid further trauma to the mandibular periodontal tissues.


Clinical case of oral trauma due to a malocclusion

Levi has a jaw length discrepancy.  The maxillas (upper jaws) are short relative to the mandibles (lower jaws).

Alternate view of Levi.

Levi's bite was not right.  It was substantially maloccluded.


Right side view demonstrates the jaw length disparity.  The lower jaws are relatively longer than the maxillas.

Left side view of Levi.

The upper fourth premolar tooth strikes the soft mucosal tissue of the mandible (lower jaw).

Left side view.

Intraoral view of an oral mass that developed secondary to the traumatic occlusion.

Alternate left side view of the oral mass.

The inflammation is severe and painful.

Alternate view.

Palatal view of the extracted fourth premolar tooth that caused the trauma.

Buccal or side view of the sutured tissue after extraction.

Right side view demonstrates the mucosal injury caused by the upper fourth premolar tooth.



Oral masses from traumatic occlusion

Cat dental care