Effect of Caries Inhibition on New Root Coating Material

Objectives: Recently, a new root coating material including PRG filler was developed for caries prevention. The purpose of this study was to evaluate the difference of demineralization by application of a root coating material or dentin bonding agents to demineralized dentin.

Methods: The buccal or lingual root surface of human third molar was ground with #600 SiC paper to expose flat dentin surface (n=24). New root coating material (SI-R20607: SH, Shofu), fluoride containing bonding agent (Bond Force: BF, Tokuyama) or non-fluoride bonding agent (MegaBond SE: MB, Kuraray) was applied on carious dentin surface, which was made by immersion into demineralized solution (pH4.0) for 4 days before application of each material. Then these samples were stored into reminiralized solution (pH7.0) for 7 days. The specimens were sectioned by means of low speed diamond saw and then ground with #1000 and #3000 grinding stones to create 160±10 µm thick specimens. All sections were subjected to contact microradiographs (CMRs). The lesion depth (LD) and mineral loss (ML) were measured used by CMR images. The data were analyzed by one-way ANOVA and Tukey-Kramer HSD Test (p>0.05).

Results: There was no significant difference of LD among the all materials (SH: 81±25µm, BF: 86±26µm, MB: 115±42µm). On the other hand, ML of SH and BF were lower than that of MB (SH: 3224±1487 Vol%¥µm, BF: 3003±967 Vol%¥µm, MB: 5874±2484 Vol%¥µm).

Conclusion: These results of this study indicated that the fluoride containing root coating or bonding agent was shown low mineral loss on root carious dentin. These kind materials might be exhibited inhibition of caries progression.