Universal adhesives applied to deep dentin with different bonding treatments.

Germán Mirotti, Mónica P Lutri, María E Kraemer, Natalia Monserrat, María C Piconi, Alicia L Caballero, Carlos A Rozas, Luis M Croharé, Mario Sezin
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Abstract

Eighth-generation adhesives may be applied with total etch, selective-etch or self-conditioning, and serve as primers for non-dental substrates.

Aim: 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.

Materials and method: 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.

Results: 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.

Conclusions: 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.

Abstract Image

Abstract Image

Abstract Image

适用于深层牙本质的通用粘接剂。
第八代粘合剂可用于全蚀刻、选择性蚀刻或自调理,并可作为非牙科基材的底漆。目的:通过剪切粘接强度和激光显微观察,探讨不同策略的万能粘接剂对深牙髓壁的粘接特性。材料与方法:36颗拔除的磨牙,雕刻出深4mm,最大宽度为4mm的空腔。根据牙基处理方式和粘结剂分为9组:全蚀组1-单键7自蚀组2-单涂7万能组3-单键万能组;金刚蚀刻:4类单键7自蚀刻、5类单涂7万能、6类单键万能;自调节:7组单键7自蚀刻,8组单涂层7通用,9组单键通用。臼齿是按照制造商的说明补上的。每组3个试件(共27个)采用万能试验机测定剪切粘结强度,其余试件采用显微镜图像和Olympus LEXT 3D软件测量层厚。方差分析用于比较数据。结果:百万帕斯卡(MPa)黏结强度均值(标准差)为:第一组:7.06±3.01;第二组:10.74±4.36;第三组: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。全蚀刻组的粘结强度(8.61±3.96)高于选择性蚀刻组(6.71±1.98)和自调节组(6.91±2.68)(p=0.049)。三种粘接剂间无显著性差异(p=0.205)。微米(μm)的粘接层为全蚀(8.71±4.93)、选择性蚀(5.49±1.70)和自调理(6.27±3.01),差异无统计学意义。结论:不同的粘接策略之间存在显著差异,以全蚀刻的值最高。自调节与选择性腐蚀无显著差异。胶粘剂之间无显著差异,均表现相似。全蚀刻组的粘接层厚度最大,不同粘接方式间无显著差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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