Effect of Two Desensitizers on Bond Strength of Different Cements to Dentine

doi:10.13701/j.cnki.kqyxyj.2018.11.021

Abstract

Abstract: Objective: To evaluate the effect of two desensitizers on shear bond strength (SBS) of dentine to resin composite of three cements after thermal-cycling. Methods: 96 premolars were divided into three groups: Duraphat, Prime&Bond NT, and control groups. Two premolars from each group were selected for scanning electron microscopy (SEM), and the remnant were assigned to three subgroups (n=10): RelyX U200, glass ionomer cement (GIC), and resin modified glass ionomer cement (RMGIC/RelyX Luting2 Cement). After 24 h storage in 37℃ water bath and thermal-cycling (5℃/ 55℃), the SBS of all groups was tested by universal testing machine. Results: Two desensitizers occluded the dentine tubules at varying degrees. Duraphat reduced the SBS significantly (P<0.05); the Prime&Bond NT + RelyX U200 improved the retentive strength (P<0.05), however, the Prime&Bond NT + GIC reduced the SBS (P<0.05), and there was no significant difference in the Prime&Bond NT + RMGIC group (P>0.05). After thermal-cycling for 24 h, the SBS values of all groups were reduced (P<0.05), and the maximum value was Prime&Bond NT + RelyX U200 group. Conclusion: Two desensitizers have different effects on three cements, and the Prime&Bond NT can enhance the SBS of RelyX U200.

Key words: Desensitizer, Cement, Shear bond strength

GU Meng-qin, TAN Yu-jie, LI Wang-yang, GUO Ling. Effect of Two Desensitizers on Bond Strength of Different Cements to Dentine[J]. Journal of Oral Science Research, 2018, 34(11): 1235-1239.

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