Bonding to Er-YAG-laser-treated Dentin

Abstract

Er-YAG laser irradiation has been claimed to improve the adhesive properties of dentin. We tested the hypothesis that dentin adhesion is affected by Er-YAG laser conditioning. Superficial or deep dentin from human molars was: (a) acid-etched with 35% H₃PO₄; (b) irradiated with an Er-YAG laser (KaVo) at 2 Hz and 180 mJ, with water-cooling; and (c) laser- and acid-etched. Single Bond (3M ESPE) and Z100 composite (3M ESPE) were bonded to the prepared surfaces. After storage, specimens were tested in shear to failure. Bonded interfaces were demineralized in EDTA and processed for transmission electron microscopy. Two-way ANOVA revealed that conditioning treatment and interaction between treatment and dentin depth significantly influenced shear bond strength results. Acid-etching alone yielded shear bond strength values that were significantly higher than those achieved with laser ablation alone, or in combination with acid-etching. The Er-YAG laser created a laser-modified layer that adversely affects adhesion to dentin, so it does not constitute an alternative bonding strategy to conventional acid etching.

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References

Aoki A, Ishikawa I, Yamada T, Otsuki M, Watanabe H, Tagami J, et al. -1998-. Comparison between Er:YAG laser and conventional technique for root caries treatment in vitro. J Dent Res 77:1404–1414.

Burkes EJ, Hoke J, Gomes E, Wolbarsht M -1992-. Wet versus dry enamel ablation by Er:YAG laser. J Prosthet Dent 67:847–851.

Ceballos L, Osorio R, Toledano M, Marshall GW -2001-. Microleakage of composite restorations after acid or Er-YAG laser cavity treatments. Dent Mater 17:340–346.

Hibst R, Keller U -1989-. Experimental studies of the application of ErYAG laser on dental hard substances I. Measurement of the ablation rate. Lasers Surg Med 9:338–344.

Hibst R, Keller U -1993-. The mechanism of Er-YAG laser induced ablation of dental hard substances. SPIE 1880:156–162.

Keller U, Hibst R -1989-. Experimental studies of the application of the Er YAG laser on dental hard substances II. Light microscopic and SEM investigations. Laser Surg Med 9:345–351.

Keller U, Hibst R -1990-. Ultrastructural changes of enamel and dentin following Er-YAG laser radiation on teeth. Proc SPIE 1200:408–415.

Keller U, Hibst R, Geurtsen W, Schilke R, Heidemann D, Klaiber B, et al. -1998-. Erbium YAG laser application in caries therapy. Evaluation of patient perception and acceptance. J Dent 26:649–656.

Li ZZ, Code JE, Van de Merwe WP -1992-. ErYAG laser ablation of enamel and dentin of human teeth determination of ablation rates at various fluences and pulse repetition rates. Lasers Surg Med 12:625–630.

10.

Matsumoto K, Nakamura Y, Mazeki K, Kimura Y -1996-. Clinical dental application of ErYAG laser for class V cavity preparation. J Clin Laser Med Surg 14:123–127.

11.

Nakabayashi N -1992-. Adhesive bonding with 4-META. Oper Dent 5-Suppl-:125–130.

12.

Nakabayashi N, Kojima K, Masuhara E -1982-. The promotion of adhesion by infiltration of monomers into tooth substrates. J Biomed Mater Res 16:265–273.

13.

Niu W, Noriko Eto J, Kimura Y, Hirono Takeda F, Matsumoto K -1998-. A study on microleakage after resin filling of Class V cavities prepared by ErYAG laser. J Clin Laser Med Surg 16:227–231.

14.

Padrós Fradera E, Arroyo Bote S -1999-. El láser de erbio-YAG en la práctica odontológica general. Quintessence 12:61–70 -Spanish edition-.

15.

Pashley DH, Sano H, Ciucchi B, Carvalho RM, Russell CM -1995-. Bond strength versus dentin structures: a modelling approach. Arch Oral Biol 40:1109–1118.

16.

Pelagalli J, Gimbel CB, Hansen RT, Swett A, Winn DW II -1997-. Investigational study of the use of Er:YAG laser versus dental drill for caries removal and cavity preparation—Phase I. J Clin Laser Med Surg 15:109–115.

17.

Sonntag KD, Klitzman B, Burkes EJ, Hoke J, Moshonov J -1996-. Pulpal response to cavity preparation with the Er:YAG and Mark III free electron lasers. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 81:695–702.

18.

Stiesch-Scholz M, Hanning M -2000-. In vitro study of enamel and dentin marginal integrity of composite and compomer restorations placed in primary teeth after diamond or Er:YAG laser cavity preparation. J Adhes Dent 2:213–222.

19.

Tay FR, Moulding KM, Pashley DH -1999-. Distribution of nanofillers from a simplified-step adhesive in acid-conditioned dentin. J Adhes Dent 2:103–117.

20.

Van Meerbeek B, Inokoshi S, Braem M, Lambrechts P, Vanherle G -1992-. Morphological aspects of the resin-dentin inter-diffusion zone with different dentin adhesive systems. J Dent Res 71:1530–1540.

21.

Versluis A, Tantbirojn D, Douglas WH -1997-. Why do shear bond tests pull out dentin? J Dent Res 76:1298–1307.

22.

Visuri SR, Walsh JT Jr, Wigdor HA -1996a-. Erbium laser ablation of dental hard tissue: effect of water cooling. Lasers Surg Med 18:294–300.

23.

Visuri SR, Gilbert JL, Wright DD, Wigdor HA, Walsh JT Jr -1996b-. Shear strength of composite bonded to Er:YAG laser-prepared dentin. J Dent Res 75:599–605.

24.

Watanabe LG, Marshall GW, Marshall SJ -1996-. Dentin shear strength: effects of tubule orientation and intratooth location. Dent Mater 12:109–115.

25.

Wright GZ, McConnell RJ, Keller U -1993-. Microleakage of class V composite restorations prepared conventionally with those prepared with an Er:YAG laser: a pilot study. Ped Dent 15:425–426.