[1] MA Rangoonwala Dent Coll, Dept Prosthodont, Pune, Maharashtra, India
[2] Coll Dent Sci & Res Ctr, Dept Prosthodont, Ahmadabad, Gujarat, India
[3] DY Patil Dent Coll, Dept Oral Pathol & Microbiol, Pune, Maharashtra, India
[4] Univ Bern, Sch Dent Med, Dept Reconstruct Dent & Gerodontol, Bern, Switzerland
[5] Univ Zurich, Ctr Dent & Oral Med Clin Fixed & Removable Prosth, Dent Mat Unit, Plattenstr 11, CH-8032 Zurich, Switzerland