Experimental studies on the influence of desensitizers on all-ceramic crown restoration of vital teeth
Objective To observe the influence of different types of desensitizers on the sealing of dentinal tubules in vital teeth and the bonding effect of all-ceramic crowns,and to provide a basis for selecting desensitizing agents for the restoration of vital teeth with all-ceramic crowns in clinical practice.Methods Intact extracted molars were collected,and dentin slices were prepared after tooth preparation.The slices were randomly divided into 4 groups:group A(control group,no treatment),group B(application of fluoride desensitizing agent(Biofluoride 12),group C(application of biologically active glass-based desensitizing agent(Actim-ins),and group D(application of HEMA-glutaraldehyde-based desensitizing agent(Gluma).Scanning electron microscope(SEM)was used to examine the surface morphology of the different groups and the sealing rate of dentinal tubules was calculated.After bond-ing the ceramic blocks to the surface of each experimental group ac-cording to a standardized protocol,a universal testing machine was used to measure the maximum shear force and analyze the experimen-tal results.Results Both Gluma and Biofluoride 12 effectively sealed the dentinal tubules.Actiminspartially sealed the dentinal tu-bules,but its sealing effect was inferior to that of Gluma and Biofluo-ride12.The Gluma group significantly enhanced the maximum shear force of resin adhesives,while both Actimins and Biofluoride 12 groups observed a decrease of maximum shear force.Conclusion HEMA-based glutaraldehyde desensitizing agent is an appropriate de-sensitizing agent for all-ceramic crown restoration of vital cracked teeth.Fluoride-based desensitizing agent and biologically active glass-based desensitizing agent are both unsuitable for all-ceramic crown restoration of vital cracked teeth.
NETL
NSTL
万方数据
