{Reference Type}: Journal Article
{Title}: Impact of CAD/CAM burs lifetime on surface properties of dental zirconia: Implications for biocompatibility of custom abutments.
{Author}: Marinho LCN;de Paiva RP;de Barros Pascoal AL;Barboza CAG;Batista AUD;Dos Santos Calderon P;
{Journal}: J Esthet Restor Dent
{Volume}: 0
{Issue}: 0
{Year}: 2024 Jul 4
{Factor}: 3.04
{DOI}: 10.1111/jerd.13277
{Abstract}: <B>OBJECTIVE: </B>To evaluate the effect of the deterioration of computer aided design/computer aided manufacturing (CAD/CAM) burs during zirconia milling, on surface roughness, contact angle, and fibroblast viability.<BR><B>METHODS: </B>Ceramic blocks were milled and 75 ceramic disks (8 × 1.5 mm) made and allocated into three groups (n = 25): G1-brand new 2L and 1L burs, G2-2L bur at the end of lifetime and brand new 1L bur and G3-both burs at the end of their lifetimes. Roughness (Ra, Rq, and Rz) was evaluated using a 3D optical profilometer, the contact angle by the sessile drop method and the cell viability of the mouse NIH/3T3 fibroblast, using the Alamar Blue assay at intervals of 24, 48, and 72 h (ISO 10993-5). Data were analyzed by one-way ANOVA and Kruskal-Wallis tests (p ≤ 0.05).<BR><B>RESULTS: </B>Roughness increased as the burs deteriorated and G3 (0.27 ± 0.04) presented a higher value for Ra (p < 0.001). The highest contact angle was observed in G3 (86.2 ± 2.66) when compared with G1 (63.7 ± 12.49) and G2 (75.3 ± 6.36) (p < 0.001). Alamar Blue indicated an increase in cell proliferation, with no significant differences among the groups at 24 and 72 h (p > 0.05).<BR><B>CONCLUSIONS: </B>The deterioration of the burs increased the surface roughness and decreased the wettability, but did not interfere in cell viability and proliferation.<BR><B>CONCLUSIONS: </B>The use of custom zirconia abutments represents an effective strategy for single crowns restorations. Our findings suggest that these abutments can be efficiently milled using CAD/CAM burs within their recommended lifetime.