de Souza Gabriel Hernandez Machado, Pandolfo Mariana Travi, Bortoluzzi Eduardo Antunes, da Silveira Teixeira Cleonice, Rossetto Hebert Luís, da Rosa Amanda Freitas, Machado Renata Gondo, da Fonseca Roberti Garcia Lucas
Endodontics Division, Department of Dentistry, Health Sciences Center, Federal University of Santa Catarina, Campus Reitor João David Ferreira Lima, Florianópolis, SC, 88040-900, Brazil.
Engineering Center, Federal University of Pelotas, Pelotas, RS, Brazil.
Odontology. 2022 Jul;110(3):535-544. doi: 10.1007/s10266-022-00686-9. Epub 2022 Jan 19.
The purpose of this study was to investigate whether the root perforation repair with mineral aggregate-based cements affects the retention of customized fiberglass posts to bovine intraradicular dentin. Sixty-four bovine mandibular incisors had their root canals endodontically treated and prepared for fiberglass posts luting. Teeth were randomly distributed into four groups (n = 16), according to the cement used for the perforations repair (MTA HP; calcium aluminate cement-CAC; and CAC + calcium carbonate nanoparticles-nano-CaCO) and control group (no perforation). The groups were redistributed according to the fiberglass posts luting protocol (n = 8): total-etching (TE) (MTA HP/TE; CAC/TE; CAC + CaCO/TE and control/TE) and self-etching (SE) (MTA HP/SE; CAC/SE; CAC + CaCO/SE and control/SE). Roots were sectioned into 1.3 mm-thick dentin slices obtaining samples that were submitted to the push-out test in Universal Testing Machine (Instron, Model 4444-0.5 mm/min). The fractured samples were analyzed under stereomicroscope and Scanning Electron Microscope (SEM). CAC/TE and CAC/SE groups had significant difference between the cervical and middle thirds (p < 0.05). When the root thirds were not considered, CAC/SE had the lowest bond strength and differed statistically from CAC/TE and CAC + CaCO/TE groups, which had the highest mean bond strength values (p < 0.05). The root perforations repair did not affect the bond strength of resin cement/customized fiberglass posts to bovine dentin. The increase in bond strength is luting protocol dependent.
本研究的目的是调查使用基于矿物骨料的水门汀进行牙根穿孔修复是否会影响定制玻璃纤维桩与牛根管内牙本质的固位力。64颗牛下颌切牙进行根管治疗并预备用于玻璃纤维桩粘结。根据用于穿孔修复的水门汀（MTA HP；铝酸钙水门汀-CAC；以及CAC+碳酸钙纳米颗粒-纳米CaCO）和对照组（无穿孔），将牙齿随机分为四组（n = 16）。根据玻璃纤维桩粘结方案（n = 8）将各组重新分配：全酸蚀（TE）（MTA HP/TE；CAC/TE；CAC+CaCO/TE和对照组/TE）和自酸蚀（SE）（MTA HP/SE；CAC/SE；CAC+CaCO/SE和对照组/SE）。将牙根切成1.3毫米厚的牙本质切片，获得样本，在万能材料试验机（Instron，型号4444-0.5毫米/分钟）上进行推出试验。在立体显微镜和扫描电子显微镜（SEM）下分析断裂的样本。CAC/TE组和CAC/SE组在颈部和中部三分之一之间有显著差异（p<0.05）。当不考虑牙根的三分之一时，CAC/SE组的粘结强度最低，与平均粘结强度值最高的CAC/TE组和CAC+CaCO/TE组在统计学上有差异（p<0.05）。牙根穿孔修复不影响树脂水门汀/定制玻璃纤维桩与牛牙本质的粘结强度。粘结强度的增加取决于粘结方案。
