“…Many studies have successfully used dental models to determine dental arch relationships Attack et al, 1997;Williams et al, 2001, Bearn et al, 2001Sandy et al, 2005;Long et al, 2011;Ozawa et al, 2011;koszelj etal., 2012;Dogan et al, 2014). Dental arch relationships are said to be reliable indicators of facial growth and predictors of treatment outcome (Harthorn et al, 1990;Ozawa et al, 2011;koszelj et al, 2012;Noveraz et al, 2014)). There are other ways of determining dental arch relationships apart from using dental models, such as using cephalometic x-rays and photographs Mostled et al, 1992;Asher Mc-Dade et al, 1992;Daskalogiannakis et al, 2011;Bartzela et al, 2012).Though use of cephalometric x-rays has been reported to be limited in patients with abnormalities such as cleft, because some land marks may be difficult to identify because of the distortion of the maxillary structures (Mostled et al, 1992).…”