Effect of bur type and conditioning on the surface and interface of dentine.

Department of Cariology, Restorative Sciences and Endodontics, University of Michigan, 1011 N. University D2361, Ann Arbor, MI 48109-1078, USA.
Journal of Oral Rehabilitation (Impact Factor: 1.93). 11/2005; 32(11):849-56. DOI: 10.1111/j.1365-2842.2005.01507.x
Source: PubMed

ABSTRACT The purpose of this in vitro study was to evaluate the surface and resin-dentine interface characteristics of permanent tooth dentine cut with diamond or carbide burs and treated with phosphoric acid (PA) or an acidic conditioner. Labial surfaces of permanent incisors were prepared into dentine with high-speed carbide or diamond burs and divided into two halves. Phosphoric acid 36% was applied on one half and non-rinse conditioner (NRC) was applied on the other half. Ten randomly selected scanning electron microscopy (SEM) fields from each specimen (n = 15) were evaluated. Occlusal surfaces of third molars were divided in two halves for evaluation of the resin-dentine interface. The halves were randomly assigned to one of each conditioner and restored with Prime & Bond NT/Spectrum. Ten specimens were analysed by SEM to evaluate hybrid layer formation and interfacial seal. We observed that surfaces prepared with carbide bur presented less residual smear plugs (P < 0.05) than surfaces prepared with diamond burs. Surfaces conditioned with NRC, which is a smear layer modifier, presented more residual smear plugs than surfaces conditioned with PA (P < 0.05). Treatment with PA resulted in more sealed interfaces than specimens treated with NRC. Within the limitations of this study the results showed that carbide burs leave a surface that is more conducive to bonding than diamond burs.

  • [Show abstract] [Hide abstract]
    ABSTRACT: The purpose of this study was to evaluate the effect of smear layer characteristics on the dentin bonding durability of HEMA-free and HEMA-containing one-step self-etch adhesives. Xeno V (XV; HEMA-free), G BOND PLUS (GB; HEMA-free) and Clearfil S(3 )Bond (S(3); HEMA-containing), were applied to dentin surfaces prepared with either #180- or #600-grit SiC paper according to manufacturers' instructions. Bond strengths to dentin were determined using µTBS test after 24-hour, 6-month, and 1-year water storage. In addition, nanoleakage evaluation was performed using an SEM. The smear layer characteristics affected water-tree nanoleakage formation in the adhesive layers of XV and GB, which contributed to a reduction in µTBS after 6-month water storage, while the characteristics did not affect the µTBS of S(3). However, regardless of the smear layer characteristics, 1-year water storage significantly reduced the µTBS of all the adhesives and was associated with an increase in failures at the adhesive-composite interface.
    Dental Materials Journal 07/2011; 30(4):501-10. DOI:10.4012/dmj.2011-001 · 0.94 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The purpose of the present study was to evaluate the bond strength and the interaction morphology of self-adhesive resin luting cements (SLCs) to dentin prepared with different methods. Four SLCs were used: RelyX U100®, RelyX U200®, Clearfil SA Luting®, and SmartCem2®. A flat dentin surface of 40 human molars was exposed and each tooth was sectioned in four tooth-quarters, which were distributed into four groups according to the SLC used to cement indirect resin composite restorations. The tooth-quarters of each group were then distributed in four subgroups according to the method used for dentin preparation: flat-ended cylindrical fine-grit diamond, flat-ended cylindrical median-grit diamond, flat-ended cylindrical plain-cut tungsten carbide, or abraded with #600-grit SiC paper (control). The restored toothquarters were sectioned to obtain beams (0.8 mm2) and submitted to the microtensile bond strength test (n = 10). The results were analyzed using two-way ANOVA/Tukey (α = 0.05). Forty-four additional teeth were used for micromorphological investigation of the SLC/dentin interface and of the topographic aspect of the dentin surfaces after application of the SLCs. Only the bond strength of RelyX U200 was significantly influenced by the surface preparation. No interference was identified on the micromorphological aspect of the bonding interfaces. The topographic investigation of the dentinal surfaces showed that the SLCs were not able to effectively remove the smear layer and etch the underlying dentin, irrespective of the preparation method. So, the interference of the dentin preparation on the bond strength of SLCs is material dependent, but don’t influence the micromorphologic aspect of the interaction zone.
    Journal of Adhesion Science and Technology 06/2014; 28(19):1-8. DOI:10.1080/01694243.2014.926850 · 1.09 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: This study evaluated the effect of 2% chlorhexidine cavity disinfectant on microleakage in class II cavities restored with light cured composites using a single bottle adhesive in an in vitro model. Proximal box cavities were prepared on mesial and distal surfaces of 40 non carious mandibular third molars, resulting in total of 80 cavities. Forty cavities on were rinsed with normal saline and 40 cavities were rinsed with 2% chlorhexidine cavity disinfectant. All cavities were restored with a single bottle adhesive and nano hybrid composite resin. Microleakage was evaluated at the gingival margin using methylene blue dye penetration method. Chlorhexidine cavity disinfectants produced significantly higher microleakage while restoring the cavities using a self-etching single bottle adhesive.
    Journal of Conservative Dentistry 10/2011; 14(4):374-7. DOI:10.4103/0972-0707.87201

Full-text (2 Sources)

Available from
May 30, 2014