IADR Abstract Archives
Ability of Direct Restoratives to Withstand Contamination and Dentin Alteration
Objectives: The aim of this study was to monitor the ability of different categories of direct restorative materials to adapt to clinically relevant conditions such as contamination or dentin alteration.
Methods: Bonding to saliva contaminated, decontaminated and altered tooth substrates (artificially hypermineralized, demineralized) were investigated and compared with clinically ideal conditions of sound, non-contaminated dentin substrates. A total of 300 human dentin specimens were randomly allocated into 15 groups (n=20) and restored with: 1) self-adhesive resin-based composite (Cention Forte/CF), 2) resin-modified glass ionomer cement (Fuji II LC/FJLC) or 3) an experimental conventional glass ionomer cement (EXP). Decontamination was implemented by rinsing followed by reapplication of cavity conditioner/primer. Shear bond strength (SBS) was performed after 1 week of storage in distilled water at 37°C and followed by fractographic and reliability analysis. Statistical analysis was performed by one- and two-way analysis of variance, Games-Howell post-hoc test (α=0.05) and Weibull analysis.
Results: Categories of contamination and dentin alteration were separately evaluated in comparison to sound dentin. (Table) The univariate analysis confirmed a significant influence (p<0.001) of the analyzed parameters: contamination (ηp2=0.085), dentin alteration (ηp2=0.553), and material (ηp2=0.675; ηp2=0.656). Post-hoc analysis identified no significant difference in SBS of each material with contamination, however significant reduction with demineralization. SBS of FJLC and EXP were only affected by demineralized substrate (p<0.001; p=0.004). CF exhibited significant increase with hypermineralization and decontamination (p=0.008; p=0.026). Bond reliability decreased in demineralized substrate groups for all materials. Predominant failure of CF was adhesive, while mixed failures were also observed for EXP and FJLC.
Conclusions: CF performed better under all tested conditions compared to FJLC and EXP. Demineralization of the dentin substrate had a highly detrimental effect, although saliva contamination was tolerable for all materials.
Methods: Bonding to saliva contaminated, decontaminated and altered tooth substrates (artificially hypermineralized, demineralized) were investigated and compared with clinically ideal conditions of sound, non-contaminated dentin substrates. A total of 300 human dentin specimens were randomly allocated into 15 groups (n=20) and restored with: 1) self-adhesive resin-based composite (Cention Forte/CF), 2) resin-modified glass ionomer cement (Fuji II LC/FJLC) or 3) an experimental conventional glass ionomer cement (EXP). Decontamination was implemented by rinsing followed by reapplication of cavity conditioner/primer. Shear bond strength (SBS) was performed after 1 week of storage in distilled water at 37°C and followed by fractographic and reliability analysis. Statistical analysis was performed by one- and two-way analysis of variance, Games-Howell post-hoc test (α=0.05) and Weibull analysis.
Results: Categories of contamination and dentin alteration were separately evaluated in comparison to sound dentin. (Table) The univariate analysis confirmed a significant influence (p<0.001) of the analyzed parameters: contamination (ηp2=0.085), dentin alteration (ηp2=0.553), and material (ηp2=0.675; ηp2=0.656). Post-hoc analysis identified no significant difference in SBS of each material with contamination, however significant reduction with demineralization. SBS of FJLC and EXP were only affected by demineralized substrate (p<0.001; p=0.004). CF exhibited significant increase with hypermineralization and decontamination (p=0.008; p=0.026). Bond reliability decreased in demineralized substrate groups for all materials. Predominant failure of CF was adhesive, while mixed failures were also observed for EXP and FJLC.
Conclusions: CF performed better under all tested conditions compared to FJLC and EXP. Demineralization of the dentin substrate had a highly detrimental effect, although saliva contamination was tolerable for all materials.