[1] Univ Oslo, Fac Dent, Dept Biomat, Oslo, Norway
[2] Oslo Univ Hosp, Dept Med Biochem, Oslo, Norway
[3] Norwegian Univ Sci & Technol NTNU, Fac Engn, Dept Struct Engn, Trondheim, Norway
[4] Univ Oslo, Fac Dent, Oral Res Lab, Oslo, Norway
[5] Univ Oslo, Fac Dent, Dept Orthodont, Oslo, Norway