Ruaa Meteab Al-Hasan, BDS, MSc candidate, Department of Conservative & Aesthetic Dentistry, Baghdad College of Dentistry, Baghdad, Iraq.
*Lamis A Al-Taee BDS, MSc, PhD, assistant professor, Department of Conservative & Aesthetic Dentistry, Baghdad College of Dentistry, Baghdad, Iraq.
Oper Dent. 2022 Jul 1;47(4):E188-E196. doi: 10.2341/21-048-L.
To evaluate the shear bond strength and interfacial morphology of sound and caries-affected dentin (CAD) bonded to two resin-modified glass ionomer cements (RMGICs) after 24 hours and two months of storage in simulated body fluid at 37°C.
Sixty-four permanent human mandibular first molars (32 sound and 32 with occlusal caries, following the International Caries Detection and Assessment System) were selected. Each prepared substrate (sound and CAD) was conditioned (10% polyacrylic acid) and bonded to Activa BioACTIVE Restorative (Activa) and Fuji II LC (F2LC) as per the manufacturers' instructions. Shear bond strength (SBS) was performed after 24 hours and two months of storage. The interfacial surfaces were examined using a digital microscope and scanning electron microscope (SEM). Three-way ANOVA, Bonferroni post-hoc tests (α=0.05), and independent T-tests were used for multifactorial analysis.
Activa exhibited reduced bond strength values to sound and CAD in comparison to F2LC after two time periods (p=0.01). There is a pronounced enhancement in SBS of F2LC when bonded to CAD (p=0.01) after storage, with no statistically significant effect on sound dentin (p=0.309). Activa showed stable SBS to sound and CAD immediately and post-aging (p>0.05). However, the evidence of mineral-like deposits under an SEM attached to the aged, debonded dentin surfaces, thereby obliterating the exposed dentinal tubules, might support the tissue repair potential of Activa.
The SBS of Activa was lower than F2LC when bonded to sound and CAD, but the bonding stability and sealing ability is advantageous in minimally invasive therapy, suggesting use with a resin composite coverage when used in stress-bearing areas.
评估两种树脂改性玻璃离子水门汀（RMGIC）在 37°C 模拟体液中储存 24 小时和两个月后对正常牙本质和龋损牙本质的剪切粘结强度和界面形态。
选择 64 颗人下颌第一磨牙（32 颗正常牙和 32 颗有咬合面龋，根据国际龋病检测和评估系统）。每个制备的基底（正常牙和龋损牙）用 10%聚丙烯酸处理并按照制造商的说明分别用 Activa BioACTIVE 修复体（Activa）和 Fuji II LC（F2LC）粘结。在储存 24 小时和两个月后进行剪切粘结强度（SBS）测试。使用数字显微镜和扫描电子显微镜（SEM）检查界面表面。采用三因素方差分析、Bonferroni 事后检验（α=0.05）和独立 T 检验进行多因素分析。
与 F2LC 相比，Activa 在两个时间段对正常牙和龋损牙的粘结强度值均较低（p=0.01）。F2LC 与 CAD 粘结后，SBS 明显增强（p=0.01），而对正常牙本质无统计学意义（p=0.309）。Activa 对正常牙和 CAD 的 SBS 即刻和老化后均稳定（p>0.05）。然而，老化、脱粘的牙本质表面 SEM 下观察到矿物质样沉积物的证据，从而掩盖了暴露的牙本质小管，这可能支持 Activa 的组织修复潜力。
Activa 与正常牙和 CAD 粘结时的 SBS 低于 F2LC，但粘结稳定性和密封能力在微创治疗中具有优势，提示在承重区域使用时，应与树脂复合材料覆盖层一起使用。
