“…Non‐surgical therapy appears to be ineffective in reducing probing depths and eliminating bacteria from implant surfaces especially in more severe cases (Persson, Samuelsson, Lindahl, & Renvert, 2010; Renvert, Hirooka, Polyzois, Kelekis‐Cholakis, & Wang, 2019). Surgical therapy has proven to be more effective in the reduction of probing pocket depths and bleeding on probing as well as in promoting new bone fill, possibly because it provides access to the defect area for removal of the granulation tissue and debridement/decontamination of the exposed implant threads (Berglundh, Wennstrom, & Lindhe, 2018; Froum et al., 2016; Sarmiento, Norton, Korostoff, Ko, & Fiorellini, 2018). The addition of bone substitutes with or without barrier membranes has demonstrated promising results in terms of radiographic defect reduction and improvement of clinical parameters, especially in well‐contained (4‐wall and 3‐wall) intrabony defects (Jepsen et al., 2016; Renvert, Roos‐Jansaker, & Persson, 2018; Roos‐Jansaker, Persson, Lindahl, & Renvert, 2014; Schwarz, Sahm, Bieling, & Becker, 2009; Schwarz, Sahm, Schwarz, & Becker, 2010; Wiltfang et al., 2012).…”