title: Assessing microleakage of different class V restorations after Er:YAG laser and bur preparation.
abstract: This study assessed in vitro marginal leakage of class V cavities prepared by turbine and Er:YAG laser and restored with different materials. Sixty cavities with enamel and dentine margins were prepared and assigned to six groups: I, II, III by turbine and IV, V, VI by Er:YAG laser. The following restorative systems were used: groups I and IV: Bond 1 + Alert; II and V: Fuji II LC; III and VI: SBMP + Dispersalloy. After finishing, specimens were thermocycled for 8 h and 45 min (500 cycles), isolated, immersed in a 0.2% Rhodamine B solution, sectioned oro-facially and analysed for leakage. The dye penetration means (%) were: occlusal I: 10.09 (+/- 21.28), II: 3.25 (+/- 10.27), III: 0, IV: 41.77 (+/- 42.48), V: 23.37 (+/- 33.79), VI: 12.66 (+/- 24.06); cervical I: 16.49 (+/- 26.67), II: 4.34 (+/- 13.71), III: 0, IV: 37.71 (+/- 30.47), V: 39.56 (+/- 43.35) and VI: 72.53 (+/- 37.79). The use of Er:YAG laser for cavity preparation yielded higher degree of marginal leakage, as compared with the use of conventional air-turbine. The enamel interface provided better marginal sealing, comparing with dentine/cementum margin. As to the cavity preparation device (i.e. laser or bur), the analysis of the results showed that bonded amalgam and Fuji II LC provided less infiltration, than Alert. On the other hand, for lased cavities, Alert provided the best results, similar to those of Fuji II LC and superior to those reached by bonded amalgam.
authors.affiliation: Department of Restorative Dentistry, University of São Paulo, SP, Brazil. nelsoncorona@uol.com.br
authors.forename: S A M
authors.initials: SA
authors.lastname: Corona
authors.forename: M C
authors.initials: MC
authors.lastname: Borsatto
authors.forename: J D
authors.initials: JD
authors.lastname: Pecora
authors.forename: R A S
authors.initials: RA
authors.lastname: De SA Rocha
authors.forename: T S
authors.initials: TS
authors.lastname: Ramos
authors.forename: R G
authors.initials: RG
authors.lastname: Palma-Dibb
mesh_terms: D003188:Composite Resins / Q000627:therapeutic use; D003723:Dental Amalgam / Q000627:therapeutic use; D003737:Dental Cavity Preparation / Q000379:methods; D003739:Dental Cementum; D003743:Dental Enamel; D003762:Dental Instruments; D003763:Dental Leakage / Q000209:etiology*; D003764:Dental Materials / Q000627:therapeutic use*; D003793:Dental Restoration, Permanent / Q000379:methods*; D003804:Dentin; D005899:Glass Ionomer Cements / Q000627:therapeutic use*; D006801:Humans; D053685:Laser Therapy; D008963:Molar; D012117:Resins, Synthetic / Q000627:therapeutic use*
chemical_list: D003188:Composite Resins; D003764:Dental Materials; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; D012117:Resins, Synthetic; D003723:Dental Amalgam