1 Department of Biomaterials, Institute of Clinical Dentistry, Univer-sity of Oslo, Oslo, Norway. ssbqasim@odont.uio.no
2 Department of Biomaterials, Institute of Clinical Dentistry, Univer-sity of Oslo, Oslo, Norway
3 UWA Dental School, University of Western Australia, 17 MonashAvenue, Nedlands, WA, 6009, Australia
4 Clinical Dentistry Division, Restorative Division, School of Den-tistry, International Medical University Kuala Lumpur, 126, JalanJalil Perkasa 19, Bukit Jalil 57000, Kuala Lumpur, Wilayah Persekutuan, Malaysia