Comparative evaluation of ICON resin infiltration and Micro-abrasion followed by CPP-ACP application on colour, mineral density and surface roughness of MIH-affected teeth in vitro

Aim
To evaluate the surface roughness, mineral density and colour change of MIH affected teeth following
surface treatment using two protocols; ICON Resin Infiltration (IRF) and Micro-abrasion followed by CPPACP (MCP).
Materials and methods
50 extracted human teeth were used in the study, 10 sound enamel [Group 1(SE)] as a control
group and 40 MIH enamel; 20 white-creamy [Group 2(IRF) and Group 3(MCP)] and 20 yellowbrown [4(IRF) and 5(MCP)] which were divided evenly based on their colour and DIAGNOdent (DD)
readings followed by randomisation prior to receiving two treatment (IRF and MCP). Measurements
were done at baseline and post-treatment (after 7 days, 1 and 3 months) using Image J (colour),
DIAGNOdent pen (DD), profilometry (Ra) and micro-CT (MD). Data was analysed using SPSS at a
significant level (p<0.05).
Results
IRF showed significant improvement compared to MCP in restoring lightness of MIH lesion after 1
month(white-creamy) and 3 months(yellow-brown) with the L* values close to those of SE (p<0.05). The
largest increase in ∆E values was in MCP groups which was significance at up to 1 month for yellowbrown MIH lesions and up until 3 months for white-creamy MIH lesion (p<0.05).
The lowest Ra was observed in SE followed by MCP. Ra significantly increased in MCP and IRF for whitecreamy MIH after 1 month (p<0.05) while a significant reduction in Ra was observed only in MCP for
yellow-brown MIH (p<0.05). DD was lowest in SE group followed by white-creamy MIH. DD decreased
significantly only for SE group after 7 days (p<0.05) and no significant difference was observed in
intervention groups (p>0.05). At baseline, SE had the highest MD followed by white -creamy MIH and the
lowest in yellow-brown MIH (IRF and MCP).
Conclusion
IRF had potential in improving lightness of the MIH lesion while MCP was more effective in colour
change especially masking white-creamy MIH lesions as well as the potential for Ra reduction. SE
exhibited better colourimprovement, lowest Ra, DD and highest MD compared to intervention groups.