Regarding the superior premolar teeth, it is
interesting to observe that some patients have only two
maxillary alveolar nerves and that the middle superior
alveolar nerve, the innervation ascribes to the premolar teeth
was often missing107,108
and was provided by the posterior
superior alveolar nerve. The innervation of the canine and
incisor teeth is normally due to anterior superior alveolar
nerve; nevertheless, Robinson and Wormald109
showed that
there was a wide variation to the branching pattern of the
anterior superior alveolar nerve and the middle superior
alveolar nerve within the anterior face of the maxilla.
Unfortunately, there are no anatomical predictors of the
innervation pattern. Therefore, clinicians may have to modify
their approach to avoid anaesthetic procedure failure.