Composite filling removal with erbium:yttrium-aluminum-garnet laser: morphological analyses

Autor(es)

Correa-Afonso, Alessandra M. ^[1] ; Palma-Dibb, Regina G. ^[1] ; Pecora, Jesus Djalma ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Restorat Dent, Ribeirao Preto Sch Dent, BR-14040904 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Lasers in Medical Science; v. 25, n. 1, p. 1-7, JAN 2010.
• Citações Web of Science: 15

Resumo

Considering the increase in esthetic restorative materials and need for improvement in unsatisfactory restoration substitution with minimal inadvertent removal of healthy tissues, this study assessed the efficacy of erbium:yttrium-aluminum-garnet (Er:YAG) laser for composite resin removal and the influence of pulse repetition rate on the morphological analyses of the cavity by scanning electron microscope. Composite resin fillings were placed in cavities (1.0 mm deep) prepared in bovine teeth, and the 75 specimens were randomly assigned to five groups according to the technique used for composite filling removal (high-speed diamond bur, group I, as a control, and Er:YAG laser, 250 mJ output energy and 80 J/cm(2) energy density, using different pulse repetition rates: group II, 2 Hz; group III, 4 Hz; group IV, 6 Hz; group V, 10 Hz). After the removal, the specimens were split in the middle, and we analyzed the surrounding and deep walls to check for the presence of restorative material. The estimation was qualitative. The surfaces were examined with a scanning electron microscope. The results revealed that the experimental groups presented bigger amounts of remaining restorative material. The scanning electron microscopy (SEM) analyses showed irregularities of the resultant cavities of the experimental groups that increased proportionally with increase in repetition rate. (AU)

• Processo FAPESP: 04/13238-6 - Eficácia do laser Er:YAG e alteração de temperatura na remoção de restaurações de resina composta
• Beneficiário: Alessandra Marques Corrêa Afonso
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 05/01680-9 - Influência da energia do laser Er:YAG na capacidade de ablação, microdureza e morfologia da dentina superficial e profunda
• Beneficiário: Regina Guenka Palma-Dibb
• Modalidade de apoio: Auxílio à Pesquisa - Regular