title: The use of bur and laser for root caries treatment: a comparative study.
abstract: This research analyzed the influence of bur and erbium, chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser caries removal on cavity characteristics and marginal seal of composite resin restorations. One hundred and forty human dental root samples were used. After in vitro root caries induction using Streptococcus mutans, the carious lesions were removed either by a conventional technique using burs (G1=control) or by using an Er,Cr:YSGG laser (λ=2.78 μm, 20 Hz, pulse duration is approximately equal to 140 μs, noncontact mode using a 600-μm tip) with the following power outputs: G2: 1.0 W; G3: 1.25 W; G4: 1.5 W; G5: 1.75 W; G6: 2.0 W; G7: 2.25 W; G8: 2.5 W; G9: 2.75 W; G10: 3.0 W; G11: 3.25 W; G12: 3.5 W; G13: 3.75 W; and G14: 4.0 W. Samples in the 14 groups (n=10) were conditioned with Clearfil SE Bond and restored with a flowable composite. They were then thermocycled (1000 cycles) and immersed into a 2% methylene blue solution for microleakage analysis. The data were statistically compared (analysis of variance or Spearman correlation tests; p≤0.05). The lased groups showed significantly greater microleakage indexes, cavity depths, and presence of residual caries than did those of the control group. There was a strong positive correlation between residual caries and microleakage. The results indicate that Er,Cr:YSGG laser irradiation is not a good alternative to the use of burs for root caries removal since it may cause a significant loss of marginal sealing in composite resin restorations.
authors.affiliation: Universidade de Uberaba, Faculdade de Odontologia, Uberaba, Brazil. vinicius.martins@uniube.br
authors.forename: V
authors.initials: V
authors.lastname: Geraldo-Martins
authors.forename: T
authors.initials: T
authors.lastname: Thome
authors.forename: M
authors.initials: M
authors.lastname: Mayer
authors.forename: M
authors.initials: M
authors.lastname: Marques
mesh_terms: D004396:Coloring Agents; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000295:instrumentation*; D003763:Dental Leakage / Q000145:classification; D018772:Dental Marginal Adaptation; D003764:Dental Materials / Q000737:chemistry; D003793:Dental Restoration, Permanent / Q000379:methods; D004867:Equipment Design; D006801:Humans; D053685:Laser Therapy / Q000295:instrumentation*; D053844:Lasers, Solid-State / Q000627:therapeutic use*; D008751:Methylene Blue; D019279:Resin Cements / Q000737:chemistry; D017213:Root Caries / Q000382:microbiology / Q000473:pathology / Q000628:therapy*; D013295:Streptococcus mutans / Q000502:physiology; D013696:Temperature; D013997:Time Factors
chemical_list: C438313:Clearfil SE Bond; D004396:Coloring Agents; D003188:Composite Resins; D003764:Dental Materials; D019279:Resin Cements; C086113:palfique estelite; D008751:Methylene Blue