Universal adhesives applied to deep dentin with different bonding treatments

• Published in: Acta odontológica latinoamericana Vol. 35; no. 3; pp. 188 - 197
• Main Authors: Mirotti, Germán, Lutri, Mónica P, Kraemer, María E, Monserrat, Natalia, Piconi, María C, Caballero, Alicia L, Rozas, Carlos A, Croharé, Luis M, Sezin, Mario
• Format: Journal Article
• Language: English; Portuguese
• Published: Argentina Sociedad Argentina de Investigación Odontológica 31.12.2022
• Subjects: Adhesives; Dental Bonding - methods; Dental Cements - chemistry; Dentin; Dentin-Bonding Agents - chemistry; DENTISTRY, ORAL SURGERY & MEDICINE; Materials Testing; Original; Resin Cements - chemistry; Shear Strength; dentin bonding agents; microscopy confocal; microscopía confocal; adhesivos dentales
• ISSN: 1852-4834; 0326-4815; 1852-4834
• DOI: 10.54589/aol.35/3/188

Eighth-generation adhesives may be applied with total etch, selective-etch or self-conditioning, and serve as primers for non-dental substrates. To determine the bonding characteristics of universal adhesives applied to the deep pulp wall with different strategies, by means of shear bond strength and laser microscopy. Cavities 4 mm deep and maximum width were carved in 36 extracted molars. Nine groups were formed according to dental substrate treatment and adhesives, as follows: Total-etch: group 1-Monobond 7 self-etch, group 2-One coat 7 universal, and group 3-Single bond universal; Adamantine etch: group 4-Monobond 7 self-etch, group 5-One coat 7 universal, and group 6-Single bond universal; Self-conditioning: group 7-Monobond 7 self-etch, group 8-One coat 7 universal, and group 9-Single bond universal. Molars were filled following the manufacturer's instructions. Three specimens per group (27 altogether) were used to determine shear bond strength using a universal testing machine, while layer thicknesses were measured on the remaining specimens using microscope images and Olympus LEXT 3D Software. Analysis of variance was used to compare data. Mean (standard deviation) bond strength in megapascals (MPa) was: group 1: 7.06±3.01; group 2: 10.74±4.36; group 3: 8.20±3.92; group 4: 7.41±2.23; group 5: 6.84±1.50; group 6: 5.86±2.10; group 7: 5.83±1.94; group 8: 7.14±2.37; group 9: 8.06±3.51. Bond strength was higher (p=0.049) for total-etch (8.61±3.96) than for selective etch (6.71±1.98) and self-conditioning (6.91±2.68). No significant difference was found among the three adhesives (p=0.205). Adhesive layer in micrometers (μm) was total-etch 8.71±4.93, selective etch 5.49±1.70 and self-conditioning 6.27±3.01, with no significant difference. There were significant differences among bonding strategies, with the highest values for total-etch. No significant difference was observed between self-conditioning and selective etch. No significant difference was found among the adhesives, which all behaved similarly. The greatest adhesive layer thicknesses were recorded in the total-etch group, with no significant difference among the various adhesive approaches.