Prevalence of middle mesial and middle distal canals in mandibular molars in an Egyptian subpopulation using micro-computed tomography.

Objectives: To study the prevalence of middle mesial and middle distal canals in permanent mandibular molars in Egyptian subpopulation using micro-computed tomography.

Materials And Methods: Two hundred and forty extracted mandibular permanent molars of Egyptian patients were scanned using micro-computed tomography, then the images were reconstructed to allow for the detection of the middle mesial (MM) and middle distal (MD) canals of the molars examined. The path of each extra canal was studied to determine the configuration of each canal.

The effect of visco-anaesthetic medicament on tactile gag reflex control.

Visco-anaesthetic medication has been used for controlling the gagging sensation in 35 dental patients during intra-oral radiography and impression making. The drug was satisfactory in 29 patients and failed to control the gagging reflex in 6 patients. A direct relation between loss of oral sensation and control of gag reflex has been established.