Effect of Nd:YAG Laser and Acidulated Phosphate Fluoride on Bovine and Human Enamel Submitted to Erosion/Abrasion or Erosion Only: An in Vitro Preliminary Study

Autor(es)

Pita Sobral, Maria Angela ^[1] ; Lachowski, Karina Monteleoni ^[1] ; de Rossi, Wagner ; Maia Braga, Sheila Regina ^[1] ; Ramalho, Karen Mueller ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Restorat Dent, Sch Dent Sao Paulo, BR-00550800 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Photomedicine and Laser Surgery; v. 27, n. 5, p. 709-713, OCT 2009.
• Citações Web of Science: 9

Resumo

Objective: The aim of the present in vitro study was to evaluate, using two different methodologies, the effectiveness of pulsed Nd:YAG laser irradiation associated with topical acidulated phosphate fluoride (APF) for preventing enamel erosion and structure loss under regimes of erosion and abrasion or erosion only. Background Data: An increased incidence of noncarious lesions (erosion and abrasion) has been observed, consequently new preventative therapies have been proposed. Materials and Methods: Two different methodologies were performed. For the first, 100 bovine crowns were submitted to four different treatments (n = 25): no treatment (control), 4 min application of APF, Nd:YAG laser irradiation (1 W, 100 mJ, 10 Hz, 141.5 J/cm(2)), and Nd:YAG laser irradiation+4 min of APF. After the specimens were exposed to citric acid (2% w/v; 30 min), they were submitted to 5000 brushing cycles. Specimen mass was measured before and after the treatments. For the second methodology, 20 human crowns were embedded in acrylic resin and cut surfaces were exposed and polished. The specimens were divided into four groups (n = 10): no treatment (control), APF for 4 min, Nd:YAG laser irradiation (1 W, 100 mJ, 10 Hz, 125 J/cm(2)), and Nd:YAG laser irradiation+APF. The samples were then immersed in citric acid (2% w/v; 90 min). Vickers hardness was obtained before and after the treatments. Results: The Nd:YAG laser irradiation+APF (bovine and human enamel) was more effective and yielded statistically significant results for surface microhardness and enamel wear. Conclusion: Nd:YAG laser irradiation associated with APF reduced bovine enamel wear and human enamel softening when samples were submitted to a regime of erosion and abrasion or erosion only in vitro. (AU)

• Processo FAPESP: 02/02003-2 - Influência de algumas substâncias associadas a escovação dental na integridade superficial de diferentes materiais indicados para restaurar lesões cervicais não cariosas
• Beneficiário: Maria Angela Pita Sobral Fernandes
• Modalidade de apoio: Auxílio à Pesquisa - Regular