“…Five of the latter found poorer glycemic control to be a significant factor associated with poorer periodontal health, the association was borderline significant in one study of dialysis patients (Chuang et al , 2005) and no difference was found in the remaining study (Sandberg et al , 2000). Among the studies providing information on differences in periodontal health classified by glycemic control status, most have been cross‐sectional, with eight of 12 publications reporting more prevalent or more severe periodontal disease in those with poorer glycemic control (Tervonen et al , 2000; Tsai et al , 2002; Guzman et al , 2003; Lu and Yang, 2004; Negishi et al , 2004; Campus et al , 2005; Jansson et al , 2006; Peck et al , 2006) and four reporting no differences (Sandberg et al , 2000; Arrieta‐Blanco et al , 2003; Karikoski and Murtomaa, 2003; Chuang et al , 2005). There was one follow‐up study identified (evidence level II‐2) that was published since 2000 (Karikoski and Murtomaa, 2003).…”