1Wolffe G N,Van der Weijden F A,Adam J.Lengthening clinicalcrowns:a solution for specific periodontal,restorative,and estheticproblems[J].Quintessence Int 1994,25(2):81-88.
3Kelly A, Dechow, Paul C. Research Patients" Perception of Pain During Ultrasonic Debridement: A Comparison between Piezoelectric and Magnetostrictive Scalers [ J ]. Journal of Dental Hygiene,2010, 84(4) :185 - 189.
4Lidia Bri6n Silva, Kathleen O. A Comparison of Dental Ultrasonic Technologies on Subgingival Calculus Remov- al: A Pilot Study[ J]Journal of Dental Hygiene, 2010, 86(2) :150 - 158.
5Busslinger A, Lampe K, Beuchat M, et al. comparative in vitro study of a magnetostrictive and a piezoelectric ultrasonic scaling instrument [ J]. J Clin Periodontol, 2001,28(7) :642 - 649.
6Cross - Poline G N, Stach D J, Newman S M. Effects of curet and ultrasonics on root surfaces [ J ] Am J Dent,1995, 8(3) :131 - 133.
7Busslinger A, Lampe K, Beuchat M, et al. A compara- tive in vitro study of a magnetostrictive and a piezoelec- tric ultrasonic scaling instrument [ J ]. J Clin Periodon- tol. 2001.28, 642-649.
8Smidt A,Lachish-Tandlich M,Venezia E. Orthodontic extrusion of an extensively broken down anterior tooth: A clinical report[J]. Qnin- tessence Int, 2005,36(2) : 89-95.
9Koh JT, Kim OJ, Park YS, et al. Decreased expressions of throm- bospondin 2 in cydospondin A-induced gi:ival overgrowth[J]. J Per- iodontal Res,2004,39(2) :93-100.
10Herrero F, Scott JB, Marois PS, et al. Clinical comparison of desired ver-Sus actual amount of surgical crownl engthening [J]. J Periodon- t01,1995,66(7) :568-571.