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Conservative Endodontic Access - Maxillary Premolar The principles of traditional endodontic cavities were established many decades ago and have remained unchanged over time. The principles of traditional endodontic cavities were established many decades ago and have remained unchanged over time. The  emerging concept of conservative endodontic access prioritizes the removal of restorative materials before tooth structure, of enamel before dentin and of occlusal tooth structure before cervical dentin. It disregards the traditional requirements of a straight-line access and complete unroofing of the pulp chamber and it emphasizes the importance of preservation of the crucial pericervical dentin (located 4 mm above and below the crestal bone) to the greatest extent possible. (for more information: Rajesh Krishan's Thesis from the University of Toronto )