Fig. 1

Experimental design flow diagram. Preparation of fresh dentin (control group) and processed dentin (experimental group) for measurement of hepatitis B virus (HBV) DNA. The teeth from chronically-infected HBV patients were severe at the cemento–enamel junction. a A segment of root (control group) cleaned of soft and hard tissues was used as fresh dentin to measure levels of HBV DNA. b Other segment of root (experimental group) was used as processed dentin particles to measure levels of HBV DNA. The HBV DNA of fresh dentin (control group) measured as copy number by quantitative polymerase chain reaction was compared that of processed dentin (experimental group)