Response to the letter to the Editor from Dr. Alexandre Rezende Vieira, entitled ‘Prevalence of molar incisor hypomineralisation has a North–South gradient between Europe and North Africa’
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The letter comments on the recent EAPD paper “Prevalence of molar incisor hypomineralisation in a group of Egyptian children using the short form: a cross-sectional study” by Saber et al. (2018) and discusses one hypothesis regarding the different MIH prevalence in various areas and for this reason the Editor wants to sincerely thank the author of the letter Dr. Alexandre Rezende Vieira from the University of Pittsburgh, USA.
There are recent review papers analysing the global MIH prevalence (Jälevik 2010; Zhao et al. 2018; Schwendicke et al. 2018; Dave and Taylor 2018), not included in the letter, that may further help the discussion of MIH prevalence in certain areas.
Just one epidemiological study from Egypt (Saber et al. 2018) cannot by any means predict the absolute prevalence figures of any area, as it is clearly shown in all the above review papers. As it is indicated by Zhao et al. (2018), three at least studies may present a more stable figure for each country/area. In addition, studies from countries nearby to Egypt have shown greater prevalence figures (Jordan, Syria, Iraq, Iran and Saudi). Only Libya has shown lower figures (Schwendicke et al. 2018).
Although it is clear from previous (Lygidakis et al. 2008) and mainly from recent aetiology studies (Bussaneli et al. 2019) that a distinct genetic predisposition does exists, it is probably a scientific overestimation to state at present that ‘a complex genetic component is the reason certain individuals have MIH’, excluding other proven aetiological factors, i.e. systemic and environmental (Fatturi et al. 2019).