Erbium, chromium:yttrium scandium gallium garnet laser for caries removal: influence on bonding of a self-etching adhesive system

Abstract

This study evaluated the influence of the dental substrates obtained after the use of different caries removal techniques on bonding of a self-etching system. Forty, extracted, carious, human molars were ground to expose flat surfaces containing caries-infected dentine surrounded by sound dentine. The caries lesions of the specimens were removed or not (control--G1) either by round steel burs and water-cooled, low speed, handpiece (G2), or by irradiation with an erbium, chromium:yttrium scandium gallium garnet (Er,Cr:YSGG) laser (2W, 20 Hz, 35.38 J/cm(2), fiber G4 handpiece with 0.2826 mm(2), non-contact mode at a 2 mm distance, 70% air/20% water--G3) or using a chemo-mechanical method (Carisolv--G4). Caries-infected, caries-affected and sound dentines were submitted to a bonding system followed by construction of a resin-based composite crown. Hour-glass shaped samples were obtained and submitted to a micro-tensile bond test. The bond strength data were compared by analysis of variance (ANOVA), complemented by Tukey's test (P <or= 0.05). The samples of sound dentine presented higher bond strengths than did samples of caries-affected dentine, except for the groups treated with the Er,Cr:YSGG laser. The highest bond strengths were observed with the sound dentine treated with burs and Carisolv. The bond strengths to caries-affected dentine were similar in all groups. Additionally, bonding to caries-affected dentine of the Er,Cr:YSGG laser and Carisolv groups was similar to bonding to caries-infected dentine. Thus, caries-affected dentine is not an adequate substrate for adhesion. Moreover, amongst the caries removal methods tested, the Er,Cr:YSGG laser irradiation was the poorest in providing a substrate for bonding with the tested self-etching system.

The effect of Er,Cr:YSGG irradiation on microtensile bond strength of composite resin restoration

“…Since Clearfil SE bond used in current study is categorized in mild self-etching bonding system according to its acidity (pH = 1.8), the μ TBS of laser-irradiated Clearfil SE bond group was the lowest of all tested groups. Other authors 23,33) also support this finding that the Er,Cr:YSGG laser-irradiated dentin is poor substrate for bonding with the self-etching system. For example, Cardoso et al 23) assessed the bonding effectiveness of adhesives to Er,Cr:YSGG laser-irradiated dentin using irradiation settings specific for cavity preparation, and demonstrated that the bond strength of Optibind FL (three-step total-etch) was the highest, followed by Clearfil SE bond (two-step self-etch), Clearfil S3 bond and Adper Prompt L-Pop (one-step self-etch).…”

Çürük Tespit Boyalarının Çürükten Etkilenmiş Dentine Kompozitlerin Bağlanma Dayanımı Üzerine Etkisi

“…Çürükten etkilenmiş dentinde elde edilen bağlanma dayanımı değerleri normal dentin ile kıyaslandığında genellikle daha düşüktür. [23][24][25] Literatürde çürük dişler kullanılarak yapılan çalışmalara bakıldığında farklı sonuçlar görülmektedir. Singh UP ve ark.…”

Evaluation of the Bond Strength of Resin Cements Used to Lute Ceramics on Laser-Etched Dentin

“…As observed by Tachibana et al using SEM, irradiated dentin presented opened dentinal tubules, with protruded peritubular dentin distributed on a scaly surface, free of a smear layer. 36 These characteristics are considered ideal for bonding to dentin. In this case, the laser irradiation initially vaporizes the water and other hydrated organic components of the tissue.…”

“…This modification could produce a dentin surface more resistant to demineralization, impairing the action of the mild pH hydrophilic primer used. 36 Fracture behavior is another property that defines the bonding of dentin to ceramic. The failure mode with the Acid + Variolink II (control) and Clearfil groups was mainly cohesive in dentin fracture.…”

“…Therefore, it is desirable to develop bonding resins and procedures that produce highly uniform bond strengths to laser-etched dentin. 36 …”