Erosion of CAD/CAM restorative materials and human enamel: An in situ/in vivo study

Repolishing in situ eroded CAD/CAM restorative materials and human enamel

“…The present study did not evaluate the effect of repolishing on the surface roughness of eroded restorative materials and enamel, although the surface roughness may be directly related to the substance loss, color, and translucency of the restorative materials and enamel. In a previous in situ study, a similar erosion protocol showed no effect on the surface roughness of CAD/CAM restorative materials but significantly roughened the enamel (ΔRa=0.59 𝜇𝑚 ) (Yang et al, 2020). However, this level of change in the surface roughness of enamel could easily be eliminated by polishing procedures (Meredith et al, 2017).…”

“…Most in vitro studies cannot fully replicate the clinical situation. In the present study, an in situ model was used to simulate the acid challenge intraorally (Yang et al, 2020;Yu et al, 2018). A cola drink was chosen due to its popularity and high erosive potential (Yu et al, 2009).…”

“…Assuming an anticipated dropout rate of 10%, the final sample size was determined to be 8 participants per group (Chen et al, 2020;Yang et al, 2020).…”

“…18-FMUSS-21) and was designed according to the Declaration of Helsinki and the Guidelines of Good Clinical Practice. The in situ protocol has been previously described in detail (Yang et al, 2020;Yu et al, 2018). Briefly, 8 healthy volunteers (4 men and 4 women, average age 23.4 years) met the inclusion criteria and participated in this study.…”

“…However, due to the negative attitudes and poor knowledge of ETW of the public, restorations may be exposed to acidic conditions over time (Attin and Wegehaupt, 2014;Hong et al, 2020). Erosion leads to surface degradation of human enamel (Attin et al, 2001;Francisconi et al, 2008;Wongkhantee et al, 2006;Yang et al, 2020) and affects the clinical behavior of CAD/CAM restorative materials (Alencar-Silva et al, 2019;Backer et al, 2017;Cruz et al, 2019;Gao et al, 2015;Kukiattrakoon et al, 2010;McKinney, 1985;Sagsoz and Polat Sagsoz, 2019;Yu et al, 2009;Yu et al, 2017). The surface microhardness (SMH) of human enamel decreased after acidic attack, and the etching pattern of enamel showed obvious demineralization (Attin et al, 1997;Yu et al, 2018).…”