[1] Univ Hosp RWTH Aachen, Dept Prosthodont & Dent Mat, Fac Med, D-52074 Aachen, Germany
[2] Univ Sao Paulo, Dept Prosthodont, Sch Dent, BR-05508000 Sao Paulo, Brazil
[3] Univ Sao Paulo, Dept Microbiol, Inst Biomed, BR-05508000 Sao Paulo, Brazil
[4] Univ Sao Paulo, Ctr Lasers & Applicat, IPEN CNEN SP, BR-05508000 Sao Paulo, Brazil
[5] Univ Sao Paulo, Dept Protese, Fac Odontol, BR-05508000 Sao Paulo, Brazil