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Journal of Peking University(Health Sciences) ›› 2019, Vol. 51 ›› Issue (2): 321-326. doi: 10.19723/j.issn.1671-167X.2019.02.023

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Effect of intrapulpal pressure on the bonding strength of resin cement to dentin

Yi-xiang PAN1,Xiu-hua LI2,Fu-cong TIAN3,Xiao-yan WANG1,∆()   

  1. 1. Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China;
    2. Fifth Clinical Division, Peking University School and Hospital of Stomatology, Beijing 100020, China
  • Online:2019-04-18 Published:2019-04-26
  • Contact: Xiao-yan WANG E-mail:wangxiaoyan@pkuss.bjmu.edu.cn

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Abstract:

Objective: To evaluate the effect of intrapulpal pressure simulation on the micro-tensile bond strength (μTBS) of resin cement to dentin.Methods: Thirty extracted human third molars were selected. Occlusal enamel was removed to expose dentine surface and teeth with residual dentin thickness of 0.5-2.5 mm were selected. Dye permeation through dentin tubules with or without intrapulpal pressure (IPP) simulation, or after Single Bond Universal (SBU) application on dentin surface with IPP simulation were observed at the end of 0 min, 5 min, 30 min and 2 h. The teeth with residual dentin thickness of (1.0±0.1) mm were divided into 2 groups with IPP simulation of 15 or 0 cmH2O (1 cmH2O=0.098 kPa), which was maintained for 30 min before bonding procedure. SBU was applied on the dentin surface and light cured, then RelyX Ultimate (RLX) cement was heaped on the dentin surface (diameter=10 mm, height=4 mm) and light-cured. After the dentin-resin cement samples were stored in distilled water for 24 h at 37 ℃, the samples were cut into beams with cross sectional area of 0.9 mm×0.9 mm for μTSB testing (n=100). The data were analyzed with two independent samples t-test (α=0.05). The fracture mode was observed using scanning electron microscopy (SEM). The results were analyzed with Fisher exact test (α=0.05). The rest of dentin-resin cement samples (five samples for each group) were cut perpendicular to the bonding interface and the morphology of the bonding interface was observed using SEM.Results: The dye permeation through dentin tubules with IPP simulation was faster than those without IPP simulation. The μTSB of RLX to dentin with and without IPP simulation were (26.26±9.78) MPa and (28.70±9.0) MPa, respectively. The most frequent fracture mode was mixed-fracture mode. There was no significant difference between the two groups for neither bond strength nor fracture types distribution (P>0.05). Regarding the morphology of dentin-resin cement bonding interface, both groups showed 4-8 μm finger-like resin tags.Conclusion: With SBU pretreatment, the IPP simulation had no influence on the immediate bond strength of RLX to dentin.

Key words: Resin cements, Intrapulpal pressure, Dentin, Tensile strength

CLC Number: 

  • R783.1

Table 1

Composition and application of adhesive and cement used in this study"

Materials Composition Application procedures pH
SBU (3M ESPE, USA) 10-MDP,Bis-GMA,dimethacrylate resins,HEMA,vitrebond copolymer, silane, ethanol, water, filler, initiators 1. Apply the adhesive to the dentin surface and rub it in for 20 s
2. Direct a gentle stream of air over the liquid for about 10 s until it no longer moves
3. Light cure for 10 s		 2.7
RLX (3M ESPE, USA) Base paste: methacrylate monomers, radiopaque silanated fillers, initiator components, stabilizers, rheological additives
Catalyst paste: methacrylate monomers, radiopaque alkaline fillers, initiator components, stabilizers, pigments, rheological additives, fluorescence dye		 1. Automix
2. Place on the dentin surface
3. Light cure for 40 s/surf

Figure 1

Schematic illustration of IPP simulation apparatus setup IPP, intrapulpal pressure; RLX, RelyX Ultimate; D, dentine. 1 cmH2O=0.098 kPa."

Figure 2

Dye permeation through dentin tubules with IPP simulation A-D, without IPP simulation; E-H, with IPP simulation; I-L, after SBU application on dentin with IPP simulation. *, residual dentin thickness (RDT) is 0.5 mm; +, RDT is 1.0 mm; #, RDT is 1.3 mm."

Table 2

Micro-tensile bond strength of RLX resin cement with or without IPP simulation and failure modes statistics (n=100)"

Groups μTBS/MPa, x?±s Fracture modes/%
Cohesive in RLX failure Mixed failure Interfacial failure Cohesive in dentin failure
SBU+RLX with IPP 26.26±9.78 9 84 0 7
SBU+RLX without IPP 28.70±9.09 9 83 0 8

Figure 3

Representative SEM images of dentin-resin cement interface of RLX A, with IPP simulation; B, without IPP simulation. RLX, RelyX Ultimate; SBU, Single Bond Universal; D, dentine; T, resin tags."

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