Universidad Nacional de Córdoba, Facultad de Odontología, Departamento de Rehabilitación Bucal, Cátedra de Operatoria I "A", Córdoba, Argentina.
Universidad Nacional de Córdoba, Facultad de Odontología, Área de Biología Odontológica, Córdoba, Argentina.
Acta Odontol Latinoam. 2022 Dec 31;35(3):188-197. 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.
通过剪切强度和激光显微镜，确定不同策略下应用于深牙髓壁的通用胶粘剂的粘结特性。
在 36 颗离体磨牙上雕刻深度为 4mm、最大宽度为 4mm 的窝洞。根据牙本质基底处理和胶粘剂的不同，将其分为 9 组：全酸蚀：第 1 组-Monobond 7 自酸蚀，第 2 组-One coat 7 通用，第 3 组-Single bond universal；金刚砂酸蚀：第 4 组-Monobond 7 自酸蚀，第 5 组-One coat 7 通用，第 6 组-Single bond universal；自酸蚀：第 7 组-Monobond 7 自酸蚀，第 8 组-One coat 7 通用，第 9 组-Single bond universal。按照制造商的说明进行填充。每组使用 3 个样本（共 27 个），使用万能试验机测定剪切粘结强度，用显微镜图像和 Olympus LEXT 3D 软件测量剩余样本的层厚。采用方差分析比较数据。
以兆帕斯卡（MPa）表示的平均（标准差）粘结强度为：第 1 组：7.06±3.01；第 2 组：10.74±4.36；第 3 组：8.20±3.92；第 4 组：7.41±2.23；第 5 组：6.84±1.50；第 6 组：5.86±2.10；第 7 组：5.83±1.94；第 8 组：7.14±2.37；第 9 组：8.06±3.51。全酸蚀（8.61±3.96）的粘结强度高于选择性酸蚀（6.71±1.98）和自酸蚀（6.91±2.68）（p=0.049）。三种胶粘剂之间的粘结强度差异无统计学意义（p=0.205）。胶粘剂层的厚度为全酸蚀 8.71±4.93μm、选择性酸蚀 5.49±1.70μm 和自酸蚀 6.27±3.01μm，差异无统计学意义。
粘结策略之间存在显著差异，全酸蚀的粘结强度最高。自酸蚀和选择性酸蚀之间无显著差异。三种胶粘剂之间无显著差异，性能相似。全酸蚀组的胶粘剂层最厚，各胶粘剂组之间无显著差异。
