Kuo, H.-Y., Kuo, P.-J., Bittner, N., & Cavallaro, J. (2021). Assessment of the changes in retention and surface topography of attachments for maxillary 4-implant-retained overdentures. The Journal of Prosthetic Dentistry, 126(3), 413.e1-413.e9. https://doi.org/10.1016/j.prosdent.2021.05.002