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. 2020 Oct;32(7):726-733.
doi: 10.1111/jerd.12635. Epub 2020 Sep 4.

Repair bond strength of dental computer-aided design/computer-aided manufactured ceramics after different surface treatments

Lulwa Al-Turki  1 , Yasser Merdad  2 , Tariq A Abuhaimed  2 , Dania Sabbahi  3 , Mazen Almarshadi  4 , Raghad Aldabbagh  1
Affiliations

Repair bond strength of dental computer-aided design/computer-aided manufactured ceramics after different surface treatments

Lulwa Al-Turki et al. J Esthet Restor Dent. 2020 Oct.

Abstract

Objective: To evaluate the microtensile bond strength of four dental computer-aided design/computer-aided manufactured (CAD/CAM) ceramics after application of four different surface treatments.

Materials and methods: Four dental CAD/CAM ceramics were tested: feldspathic ceramic (VITABLOCKS-Mark II), polymer-infiltrated ceramic network (VITA ENAMIC), zirconia-reinforced lithium silicate (VITA SUPRINITY), and yttria-stabilized zirconia (VITA YZ T). Four surface treatments were applied: no treatment, 5% hydrofluoric acid-etching, airborne particle abrasion, and tribochemical silica coating. The ceramic blocks were repaired with nanohybrid composite (Tetric N-Collection). Sixteen test groups of 12 specimens were prepared. After thermocycling, microtensile bond testing was performed. The microtensile strengths values were statistically analyzed using two-way analysis of variance and Tukey's post-hoc test.

Results: Repaired feldspathic and resin polymer-infiltrated ceramic network ceramics demonstrated superior microtensile bond strengths compared to zirconia-reinforced lithium silicate and yttria-stabilized zirconia. Etched feldspathic and polymer-infiltrated ceramic network ceramics had higher bond strength than the untreated groups. Surface treatments did not affect the bond strength of zirconia-reinforced lithium silicate and yttria-stabilized zirconia with the exception of etching, which reduced the bond strength of yttria-stabilized zirconia.

Conclusion: Feldspathic ceramic and polymer-infiltrated ceramic network were repaired with dental composite after surface etching with hydrofluoric acid. Repair of zirconia-reinforced lithium silicate and yttria-stabilized zirconia did not demonstrate promising results.

Clinical significance: Repair of feldspathic ceramic and polymer-infiltrated ceramic network restorations may be a cost-effective means to promote the longevity of dental restorations. However, zirconia and zirconia-reinforced lithium disilicate restorations do not offer such an option.

Keywords: CAD/CAM ceramics; airborne particle abrasion; hydrofluoric acid; microtensile bond strength; repair; tribochemical silicoating.

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References

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