Objective To evaluate the effect of charcoal‐based dentifrices on the color change (CC) and surface wear (SW) of resin composites. Materials and Methods Five dentifrices, including three toothpastes: Colgate total‐12 (C12), Black is the new White (CPX), and Natural (NAT); and two powders: Carvvo (CVV) and Whitemax (WMX), were evaluated. Composite blocks (5x5x2mm‐ Z350 3 M/ESPE, shade A2) were subjected to 417 and 5004 brushing cycles. The CC (n = 7, CIEDE2000; ΔE00) was evaluated using a spectrophotometer. SW (n = 5) was assessed using profilometry. The dentifrice particles were characterized by scanning electron microscopy (SEM). Results In 417 brushing cycles, resin composite exhibited higher color change upon being exposed to NAT, CVV and WMC than to C12 (p ≤ 0.05). In 5004 brushing cycles, resin composite showed higher color change values when exposed to all dentifrices, except C12 (p ≤ 0.05). The powders promoted higher SW on resin composite than C12 in both evaluation times (p ≤ 0.05). In 417 cycles, WMX caused higher SW on composite than C12, CPX, and NAT (p ≤ 0.05). No significant different SW was found between powders and charcoal‐based toothpastes after 5004 brushing cycles (p > 0.05). SEM showed larger particles for powder than for toothpaste dentifrices. Conclusion Within the limitations of this study, both null hypotheses have been rejected. Resin composites exposed to charcoal‐based dentifrices exhibited significantly (p ≤ 0.05) higher color change and surface wear than conventional toothpastes. Clinical Significance Color change and surface wear shown by charcoal dentifrices may compromise the longevity of restorations.

This study presented a micro-CT analysis in mandibular condyles of rats with the experimental condition of dental occlusal trauma in molar region. The mandibular condyles were evaluated according to trabecular bone orientation in subchondral area.

In this study, we investigated the 3D bone trabecular characteristics of the mandibular condyle of adult rats with dental occlusal change using micro-CT analysis.