*Ika andryas1, Ira Tanti2,3, Tengku Syarfina3, Guang Hong4, Lindawati Kusdhany2
(1. Faculty of Dentistry, Universitas of Indonesia , 2. Prosthodontic Department, Faculty of Dentistry, University of Indonesia; , 3. Faculty of Cultural Science, Universitas Sumatera Utara, 4. Liaison Center for Innovative Dentistry, Graduate School of Dentistry, Tohoku University, Sendai, Japan)