Effect of the double application of universal adhesives on the dentine bond strength after radiotherapy

Abstract

Background This study aimed to evaluate the effect of double application of universal adhesives on bond strength to dentine after ionizing radiation. Methods One hundred and forty caries‐free human third molars were used. Half of the teeth were irradiated (IR) (70.2 Gy). The IR and non‐IR teeth were assigned into seven groups (n = 10). Universal adhesives Single Bond Universal (3M Oral Care), Gluma Bond Universal (Heraeus Kulzer) and Prime&Bond Elect (Dentsply) were employed (following manufacturer’s instructions and double application). Two‐step self‐etch adhesive Clearfil SE Bond (Kuraray Noritake) was used as control. After composite build‐ups were bonded to mid‐coronal occlusal dentine surfaces, the specimens were stored in water (37°C/24 h) and sectioned into microspecimens. The specimens were subjected to μTBS testing (1.0 mm/min). Failure analysis was performed using stereomicroscope and scanning electron microscopy. Data were analysed with two‐way ANOVA and Tukey’s test (P = 0.05). Results The radiotherapy caused reduction in the bond strength of universal adhesives when the adhesives were used with single application after radiotherapy (P < 0.05). The double application resulted in increased bond strength of the universal adhesives to IR dentine (P < 0.05). Conclusions The double application was beneficial in improving the dentine bond strength of universal adhesives affected by radiotherapy after ionizing radiation.

Os impactos da radioterapia na estrutura dental e suas consequências no tratamento odontológico

“…Portanto, a falta do ácido em adesivos autocondicionantes pode ser uma hipótese para melhores resultados. Ugurlu et al, (2020) sugere que a dupla aplicação do adesivo universal leva a uma melhora na resistência de união da dentina após a radiação ionizante, isso ocorre porque a resistência pode melhorar, aumentando a qualidade da hibridização ou a espessura da camada adesiva com a dupla aplicação. Além disso, o aumento da espessura do adesivo pode compensar a integridade da camada híbrida que pode ser danificada pela irradiação, além de proporcionar uma camada adesiva mais uniforme e compensar possíveis defeitos da aplicação.…”

Shear bond strength of orthodontic molar tubes to composite restoration bonded with particular adhesives after different surface pre‐treatments

“…Inclusion criteria for the teeth were as follows: the absence of endodontic treatment, carious lesions, restorations and enamel defects, such as enamel hypoplasia, enamel hypomineralization or visible cracks. The teeth were disinfected in 0.5% chloramine‐T solution for 2 weeks, stored in distilled water at 37°C and used within 3 months after extraction 20 . The teeth were controlled for the absence of cracks and defects using a stereomicroscope (S4E, Leica Microsystems).…”

How Does Radiotherapy Affect the Adhesion of Universal Adhesive to Enamel and Dentin? a Qualitative and Quantitative Analysis?

“…Therefore, it is critical for an HNC patient to organize a timely treatment plan, with the use of the most beneficial adhesive system to achieve optimized treatment. However, there are controversial results, which are attributed to the selection of adhesive systems (11,12,13). Thus, adhesive systems must be chosen according to the substrate, and the selection of the most appropriate restorative material may be important under irradiated circumstances (14).…”