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*  Evaluation of the cement/dentin thickness of the mesiobuccal root of maxillary first molars by optical microscopy in a Chilean...
... avoiding excessive wear on the dentinal walls or applying excessive forces during the obturation stage [6,17,25], especially in ... when using ultrasonic instruments in retrograde preparations since their use requires a minimum thickness of 1 mm to avoid ...
http://www.alliedacademies.org/articles/evaluation-of-the-cementdentin-thickness-of-the-mesiobuccal-root-of-maxillary-first-molars-by-optical-microscopy-in-a-chilean-samp-8178.html