@article{ETD,
      recid = {2908},
      author = {Knapp, Brandon},
      title = {Fracture toughness, clarity, and staining of thermoplastic  orthodontic retainer materials},
      publisher = {Oregon Health and Science University},
      school = {M.S.},
      address = {2014},
      number = {ETD},
      url = {http://digitalcollections.ohsu.edu/record/2908},
      doi = {https://doi.org/10.6083/M4N878JM},
}