Risk Stratification
Do the patients teeth meet abnormally (i.e. malocclusion)? A number of clinical findings have been identified to correlate with the presence of a mandibular fracture. In one study, malocclusion, trismus, facial asymmetry and a positive tongue blade test were all strongly associated with a fracture [8].
A clinical decision rule for radiography in mandibular trauma has also been developed, namely:
| 1. Do the patients teeth meet abnormally (i.e. malocclusion)? |
| 2. Is the patient unable to open his/her mouth normally (i.e. trismus)? |
| 3. Does the patient have any broken teeth? |
| 4. Does the patient report pain while their mouth is closed? |
| 5. Is there a step deformity? |
| If yes to any of the above, then request mandibular x-ray |
The presence of any of these five factors produced a 100% sensitive rule for x-ray.
The authors of the rule report that its use could reduce the number of x-rays done in mandibular trauma by 30% and that it outperformed clinicians diagnostic ability.
Learning Bite
The use of a decision rule for mandibular trauma is highly sensitive and may reduce the number of x-rays done by 30%.