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This study was conducted for morphological and quantitative evaluation of the diffusional pattern of infiltration anesthesia according to the site of injection. The maxillary first molar of rats was anesthetized by local infiltration of 100 μL of 2% lidocaine containing trypan blue at a distance of 2 mm from the palatal mucogingival junction or mucobuccal fold over the root apex of the maxillary first...