Endodontic Radiopacifying Application of Barium Titanate Prepared through a Combination of Mechanical Milling and Heat Treatment oleh Hsiu-Na Lin, Wei-Wen Chen, Chun-Chun Hsu, May-Show Chen, Pei-Jung Chang, Wei-Min Chang, Fang-Hao Zhang, Chin-Yi Chen, Pee-Yew Lee, Chung-Kwei Lin