5Gottehrer N R, Seeger A, Tschemitschek H. Placement of thepreparation line and periodontal health-a prospective 2 -yea rclinical study[J]. Dent Today, 2003,22 ( 1 ) : 64-69.
6Newell D H, John V, Kim S J. Atechnique of occlusal adiustment for food impaction in the presence of tight proximal contacts[J]. Ope Dent, 2002,27 ( 1 ) : 95-100.
7Agrawal KR,Lucas PW,Bruce IC.The effects of food fragmentationindex on mandibular closing angle in human mastication[J].ArchOral Biol,2000,45(7):577-84.
