问答题What are the five mechanical objectives of root canal shaping①Develop a continuously tapering form②Make the canal narrower apically with the narrowest cross-sectional diameter at its terminus③Make the preparation in multiple planes④Never transport the foramen⑤Keep the apical foramen as small as practical⑥To clean and seal foramen, MAF should be at least No.B0 or BE in the ISO sizing

问答题Master apical file The largest file that perform apical enlargement.

问答题DMF(S) indexDMF(S) to denote decayed, missing, and filled surfaces in permanent teeth.

问答题Rubber damThe rubber dam is a thin sheet of rubber which, when placed over a single tooth or a group of teeth, excludes saliva from the field of operation.

问答题Resistance formResistance form is the cavity form to prevent the remaining tooth and filling substasnce form fractured during mastication.