Effect of TiO₂ Abutment Coatings on Peri-Implant Soft Tissue Behavior: A Systematic Review of In Vivo Studies

Table 2

Risk of bias results for the studies using the OHAT rating tool.

Authors	Selection bias	Confounding bias	Performance bias	Attrition bias	Detection bias	Selective reporting bias
Glauser et al. [47]	−	+	−	++	−	+
Schupbach and Glauser [48]	−−	+	−	+	−	+
Wennerberg et al. [41]	++	++	+	+	+	++
Göthberg et al. [42]	++	+	++	+	++	+
Raes et al. [43]	++	++	+	+	−	++
Hall et al. [44]	++	++	+	++	+	++
Dib-Zaitum et al. [45]	++	+	++	++	−	++
Farrag and Khamis [46]	++	++	+	++	+	+
Ungersböck et al. [40]	−	+	−	−	+	++
Susin et al. [35]	++	++	+	++	++	++
Fukayo et al. [37]	−	−	−	+	−	++
Rossi et al. [36]	−	++	−	+	+	+
Areva et al. [39]	+	+	−	+	−	+
Paladan et al. [38]	+	+	−	−	−	+
Welander et al. [34]	−	−	−	+	+	+

Note: “++”: definitely low risk of bias; “+”: probably low risk of bias; “–”: probably high risk of bias; and “– –”: definitely high risk of bias.