Teeth with molar incisor hypomineralization in children have lower dental pulp oxygen saturation

Abstract Objectives: The aim of this manuscript was to evaluate pulp tissue oxygen saturation (SaO2) in first permanent molars (FPM) with and without molar incisor hypomineralisation (MIH), to answering the question whether severe cases of MIH can have different SaO2 values. Methods: A cross-sectional study involving 29 children (16 girls, 13 boys, aged 7-11 years) assigns 116 FPM. The FPM included were divided without MIH (G1, n = 48) and with MIH (G2: Mild MIH, n = 30 and G3: Severe MIH, n = 38). Pulp oximetry was conducted twice (each 30 seconds) in all groups. Results:There were significant variations in SaO2 levels based on MIH severity. Median SaO2 in the control group was 94% (Q1=90%; Q3=98%), while MIH cases show SaO2 variations: Mild (79%, Q1=71.5%; Q3=83.5%) and Severe (68%, Q1=55%; Q3=75%) (p<0.01). FPM with MIH (G2 and G3) exhibit lower SaO2 levels than healthy teeth (G1), with severe cases showing even lower levels than mild ones. Conclusions: This research contributes valuable insights into the association between MH severity and pulp oxygen saturation, offering implications for clinical management. Clinical relevance: The pulse oximeter for measuring SaO2 in the dental pulp of teeth with MIH could be an alternative for thermal tests in children with this condition. Current thermal tests can generate fear and anxiety in pediatric patients.