@article{kwang-mahn kim2020of,
  title={Effect of Heat and Sonic Vibration on Penetration of a Flowable Resin Composite Used as a Pit and Fissure Sealant},
  author={hae-jung kim,hyung-jun choi,ki-yeol kim,kwang-mahn kim},
  journal={Journal of Clinical Pediatric Dentistry},
  volume={44},
  number={1},
  pages={41--46},
  doi = {10.17796/1053-4625-44.1.7},
  year={2020}
}