Occlusal trauma
（重定向自Occlusal traumatism）
![An example of secondary occlusal trauma. This X-ray film displays two lone-standing mandibular teeth, #21 and #22, or the lower left first premolar and canine. As the remnants of a once full complement of 16 lower teeth, these two teeth have been alone in opposing the forces associated with mastication for some time, as can be evidenced by the widened PDL surrounding the premolar Because this trauma is occurring on teeth that have 30-50% bone loss, this would be classified as secondary oclcusal trauma.](/Images/godic/202501/30/Periodontalboneloss5736.JPG")
Occlusal trauma is a dental term that refers to the damage incurred when teeth are left in traumatic occlusion without proper treatment.
When the maxillary and mandibular dental arches approach each together, as they do, for example, during chewing or at rest, the relationship between the opposing teeth is referred to as occlusion. If this occlusal relationship is not balanced properly it may result in pain, tenderness and even mobility of the affected teeth.