This theory stated that in the mandible, the outer nerves innervated molars while the inner nerves supplied incisors. The theory was suggested when studies showed that local anaesthetic failure after a mandibular block was highest in incisors, followed by premolars and molars.
Source: Lecture from David Isen, May 26, 2010 (d.isen@rogers.ca) from a Powerpoint Slide referencing Kanaa et al, J of Endo, 32:919-923, 2006.
Hans Skariah, B.Sc., DMD
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