1. * Sigalit Blumer, DMD, Senior Lecturer, Head, the Department of Pediatric Dentistry, the Maurice and Gabriela Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
2. Hila Eliasi, DMD, Private Practice.
3. Benjamin Peretz, DMD ,Professor Emeritus, the Department of Pediatric Dentistry, the Maurice and Gabriela Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
4. Johnny Kharouba, DMD, Lecturer ,the Department of Pediatric Dentistry, the Maurice and Gabriela Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
5. Ehud Jonas, DMD, This study was performed as a partial fulfillment towards the degree of Doctor of Dental Medicine conferred by the Tel Aviv University.