Unusual horizontal and vertical root fractures of maxillary molars: an 11-year follow-up.

Intra-alveolar root fractures of posterior teeth are rare when compared with other dental injuries. This case report describes one vertical and two horizontal root fractures of teeth 3, 14, and 15. The teeth all tested normal to cold and electric pulp tests. The patient reported no history of accidental trauma, and no signs of scarring were found. These fractures were discovered during a routine full-mouth radiographic survey. All teeth were asymptomatic and in good function. During the 11 yr that followed, there was no dental treatment, except for routine periodontal maintenance. The patient had one abscess that occurred after 9 yr on tooth 3, which had to be extracted. The upper left molars are surprisingly still in function and asymptomatic. Either occlusal or lateral trauma may be the cause of these fractures. This would strongly suggest night guard appliances for patients who clench or grind. A psychological evaluation of the patient might reveal neurosis, anxiety, or stress situations affecting teeth.