Hybrid ceramic repair strength, surface roughness, and bond failure, using methylene blue-activated low-level laser therapy, Carbon dioxide, and Ti: Al2O3 laser

• Published in: Photodiagnosis and photodynamic therapy 2023-09, Vol.43, p.103693-103693, Article 103693
• Main Authors: Alsunbul, Hanan, Almutairi, Basil, Aljanakh, Mohammad, Abduljabbar, Tariq
• Format: Article
• Language: English
• Subjects: Carbon dioxide laser; Hybrid ceramics; Hydrofluoric acid; Phoyodynamic Therapy; Silane; Ti-Sapphire laser
• ISSN: 1572-1000; 1873-1597
• DOI: 10.1016/j.pdpdt.2023.103693

•The current gold standard for hybrid ceramic conditioning is the use of hydrofluoric acid combined with a silane coupling agent.•Ti-sapphire laser and Carbon dioxide laser do not obtain the same results as HFA-S.•Low-level laser therapy with methylene blue photosensitizer is not recommended for the treatment of hybrid ceramics. To evaluate the impact of various pretreatment regimes (LLLT, Ti-sapphire laser, CO2, and HFA-S) on hybrid ceramics, specifically focusing on their ability to enhance repair strength and minimize surface roughness (Ra). Discs were made from hybrid ceramics and after disinfection were randomly divided into four groups based on different surface conditioning techniques. Each group consisted of 15 discs, resulting in a total sample size of 60. dics in group 1 was surface treated with Low-level laser therapy (LLLT) using methylene blue (MB), Discs in group 2 with Ti-sapphire laser, Discs in group 3 with CO2 laser, and discs in group 4 with HFA-S. Five samples from each group were assessed for Ra. The remaining 10 samples from each group underwent repair using a porcelain repair kit in adherence to the planned instructions. The bond strength of each sample in all groups was measured using a universal testing machine. Following the bond strength testing, the specimens from all study groups were analyzed to determine the mode of failure. To evaluate the data, a two-way analysis of variance (ANOVA) was used, followed by post hoc multiple comparisons. The highest repair bond strength was observed in group 4 hybrid ceramics pretreated with HFA-S (19.05±0.79 MPa). The lowest repair bond scores were observed in group 1 hybrid ceramics preconditioned with LLLT in the presence of Photosensitizer (13.41±0.36 MPa). The highest Ra scores were exhibited in group 2 surface treated with Ti-sapphire laser (0.0515±0.16 µm) and the lowest Ra scores were observed in Group 4 HFA-S (0.0311±0.79 µm). Predominant bond failure among different investigated groups was cohesive. The current gold standard for hybrid ceramic conditioning is the use of hydrofluoric acid (HFA) combined with a silane coupling agent. Low-level laser therapy with methylene blue photosensitizer is not recommended for the treatment of hybrid ceramics.