title: Comparative histological analysis of bone healing of standardized bone defects performed with the Er:YAG laser and steel burs.
abstract: This study compares the bone repair process after ostectomies performed either with the erbium:yttrium-aluminum-garnet (Er:YAG) laser or with the low-speed bur drilling. Eighteen rats were used for this study. In the control group, the ostectomy was performed with a low-speed bur drilling. In the experimental group, the ostectomy was made with an Er:YAG laser (500 mJ, 10 Hz). At 7 and 14 days after surgery, the experimental group presented earlier bone repair in comparison to the control group. The experimental group presented an altered layer of approximately 24-microm thickness, whereas the control group did not present any altered layer in the margins of the ostectomies. At 21 days, the histological features of the two groups were very similar, although the altered layer could still be seen. The Er:YAG laser successfully promoted the ablation of the bone tissue, but caused some thermal damage at the margins of the ostectomies.
authors.affiliation: Faculdade de Odontologia, Programa de Pós-Graduação em CTBMF, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, RS, Brazil. edam@bighost.com.br
authors.forename: Elaine Duarte Artuso
authors.initials: ED
authors.lastname: de Mello
authors.forename: Rogério Miranda
authors.initials: RM
authors.lastname: Pagnoncelli
authors.forename: Egberto
authors.initials: E
authors.lastname: Munin
authors.forename: Manoel Sant'Ana
authors.initials: MS
authors.lastname: Filho
authors.forename: Guilherme Paulo Scarpel
authors.initials: GP
authors.lastname: de Mello
authors.forename: Emília Angela Loschiavo
authors.initials: EA
authors.lastname: Arisawa
authors.forename: Marília Gerhardt
authors.initials: MG
authors.lastname: de Oliveira
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D004871:Erbium; D008297:Male; D010012:Osteogenesis / Q000528:radiation effects*; D010027:Osteotomy / Q000295:instrumentation*; D010784:Photomicrography; D051381:Rats; D017208:Rats, Wistar; D013232:Steel; D013977:Tibia / Q000528:radiation effects* / Q000601:surgery; D013997:Time Factors; D014945:Wound Healing / Q000528:radiation effects*
chemical_list: D013232:Steel; D004871:Erbium