5Roulet JF. Benefits and disadvantages of tooth--coloured alternatives to amalgam [J]. J Dent, 1997, 25(6) : 459--473.
6Topalova- Pirinska S, R. Pirinska. Our experience with Gradia direct in the restoration of anterior teeth[J]. Journal of IMAB, 2006, 2 : 14-18.
7Gemalmaz D, Ergin S. Clinical evaluation of all ceramic crowns [J]. J Prosthet Dent, 2002, 87(2) :189--196.
8Corah NL,O' Shea RM, Donald G, et al. The dentist --patient relationship: perceived dentist behaviors that reduce patient anxietyand increase satisfaction [J]. J Am Dent Assoc, 1988, 116 : 73--78.
9Gedalia, I, Ionat--Bendat D, Ben--Mosheh S, et al. Tooth enamel softening with a cola type drink and re--hardening with hard cheese or stimulated saliva in situ [J]. J Oral Rehabil Nov, 1991, 18(6) :501--506.
10Hunter, M, West NX, Hughes JA, et al. Erosion of deciduousand permanent dental hard tissue in the oral enviromment [J]. J dent may, 2000, 28(4): 257--263.
