3Oakley E,Rhyu IC,Kartrlzas S. Formation of the biologic width fol-lowing crown lengthening in nonhuman primates [ J]. Int J Peri-odont Rest Dent,1999,19(6) :529 -541.
5Kan JY, Rungchaxasseng K, Ojano M, et al. Flapless anterior im-plant surgery : a surgucal and prosthodontic rational[ J]. Pract Peri-odontics Aesthet Dent,2000,12(5) :467 -474.
6Harashima T,Kinoshita J,Kimura Y,et al. Morphological compara-tive study on ablation of dental hard tissues at cavity preparation byEr: YAG and Er, Cr: YSGG lasers [ J] . Photomed Laser Surg,2005,23(1) :52-55.
7Eversole LR,Rizoiu I, Kimmel AL. Pulpal response to cavity prepa-ration by an erbium, chromium YSGG laser-powered hydrokineticsystem[ J]. J Am Dent Assoe,1997,128(8) :1099 - 1106.
9Me Guire, Michael K, Scheyer E, et al. Laser-assisted flaplesscrown lengthening: a case series [ J]. Int J Periodont Res Dent,2001,31(4):357 -364.
10Strong MS, Vaughan CW, Jako G J, et al. Transoral resection of cancer of the oral cavity: the role of the C02 laser [J]. Otolaryn- gol Clin North Am, 1979,12( 1 ) : 207-218.
