Utomo, H., Kriswandini, I.L. and Ernawati, D.S. 2006. The periodontal pain paradox: Difficulty on pain assesment in dental patients (The periodontal pain paradox hypothesis). Dental Journal. 39, 4 (Dec. 2006), 143–146. DOI:https://doi.org/10.20473/j.djmkg.v39.i4.p143-146.