|
1
|
Lin HN, Wang LC, Chen MS, Chang PJ, Lin PY, Fang A, Chen CY, Lee PY, Lin CK. Discoloration Improvement by Mechanically-Milled Binary Oxides as Radiopacifier for Mineral Trioxide Aggregates. MATERIALS (BASEL, SWITZERLAND) 2022; 15:7934. [PMID: 36431419 PMCID: PMC9695230 DOI: 10.3390/ma15227934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 11/02/2022] [Accepted: 11/08/2022] [Indexed: 06/16/2023]
Abstract
Mineral trioxide aggregates (MTA) have been widely used in endodontic treatments, but after some time, patients suffer tooth discoloration due to the use of bismuth oxide (Bi2O3) as a radiopacifier. Replacement of Bi2O3 with high energy ball-milled single (zirconia ZrO2; hafnia, HfO2; or tantalum pentoxide, Ta2O5) or binary oxide powder was attempted, and corresponding discoloration improvement was investigated in the present study. Bi2O3-free MTA is expected to exhibit superior discoloration. The radiopacity, diametral tensile strength, and discoloration of MTA-like cements prepared from the as-milled powder were investigated. Experimental results showed that MTA-like cements prepared using Ta2O5 exhibited a slightly higher radiopacity than that of HfO2 but had a much higher radiopacity than ZrO2. Milling treatment (30 min to 3 h) did not affect the radiopacities significantly. These MTA-like cements exhibited superior color stability (all measured ΔE00 < 1.0) without any perceptible differences after UV irradiation. MTA-like cements prepared using ZrO2 exhibited the best color stability but the lowest radiopacity, which can be improved by introducing binary oxide. Among the investigated samples, MTA-like cement using (ZrO2)50(Ta2O5)50 exhibited excellent color stability and the best overall performance with a radiopacity of 3.25 mmAl and a diametral tensile strength of 4.39 MPa.
Collapse
Affiliation(s)
- Hsiu-Na Lin
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
- Department of Dentistry, Chang Gung Memorial Hospital, Taipei 105, Taiwan
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
| | - Ling-Chi Wang
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
- Center of Dental Technology, Chang Gung Memorial Hospital, Linkou, Taoyuan 333, Taiwan
| | - May-Show Chen
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
- Division of Prosthodontics, Department of Dentistry, Taipei Medical University Hospital, Taipei 110, Taiwan
| | - Pei-Jung Chang
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
- Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei 106, Taiwan
| | - Pin-Yu Lin
- Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung 202, Taiwan
| | - Alex Fang
- Department of Engineering Technology and Industrial Distribution, Texas A & M University, College Station, TX 77843, USA
| | - Chin-Yi Chen
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
- Department of Materials Science and Engineering, Feng Chia University, Taichung 407, Taiwan
| | - Pee-Yew Lee
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
- Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung 202, Taiwan
| | - Chung-Kwei Lin
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
- School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
| |
Collapse
|