The aim of this study was to evaluate the efficacy of PO and LDF in immature, young permanent teeth which have different root formation level (RFL).
Method: Recordings of PO and LDF and the responses of electrical pulp tests (EPT) were taken from 138 healthy maxillary permanent incisors (45 couple of central-24 couple of lateral) which have different RFL, in totally 45 children (between 8-12 years-old, mean: 9.7±1.1).
Results: The LDF values demonstrated a negative correlation between children’s age (r= -0.60, p=0.0001) and a positive correlation between root apex distance (millimeter) of teeth (r= 0.85, p=0.0001) although PO didn’t demonstrated any significant correlation. The calculated selectivity of PO and EPT was 0.97 and 0.95 respectively.
Conclusions: It was determined that the pulpal blood flow of young permanent teeth had decreased with age and the progression of root formation stage. LDF was found to be a more reliable and effective method in monitoring of pulpal blood flow and vitality of immature young permanent teeth. However, the improvement of LDF with further researches is indicated.