Abstract:

Abstract:Objective To investigate the effect of using the VivaSens desensitizier on tooth-whitening surface before bleaching with Beyond cold light and efficacy of bleaching and to clarify its application value in cold light bleaching. Methods 15 patients who deserved the treatment were chosen,in total of 299 teeth， their upper or lower dentitions were used as a sample.The upper dentitions (including anterior teeth and premolar teeth) or lower dentitions(including anterior teeth and premolar teeth ) from the same patient were randomly divided into experimental group(n=15,150 teeth，8 upper dentitions，7 lower dentitions) and control group(n=15,149 teeth，7 upper dentitions，8 lower dentitions).Before bleaching,the VivaSens desensitizer was applied on the buccal surfaces in experimental group,and a placebo gel was applied on the buccal surfaces in control group.The tooth hypersensitivities of the patients were measured by probe and cold air test before and after treatment with a 0-to-10 scale,and the postoperative 101 teeth（94%） in experimental group and all of teeth in control group experienced dental hypersensitivity right after bleaching(P<0.01).After 24 h,22 teeth（14.7%） in experimental group still had dental hypersensitivity,while 75 teeth（50.3%） in control group had,there was significant difference of incidence of dental hypersensitivity between two groups (P<0.01);after 48 h,the dental hypersensitivity in experimental group  disappeared,but 16 teeth（10.7%） in control group still had,there was significant difference of incidence of dental hypersensitivity between two groups (P<0.01).The dental hypersensitivities in experimental groups during different stages were lower than those in control group(P<0.05).The Vita Shade Guide results showed that  before and after bleaching,experimental and control group showed a change of 5 Shade Guide Units after treatment compared with before treatment;and there was no difference of bleaching effect between two groups(P>0.05).Conclusion VivaSens desensitizer could effectively reduce the incidence and intensity of postoperative hypersensitivity without affecting the bleaching effect.

Key words: tooth bleaching, dental hypersensit
ivity, VivaSens desensitizer