Silva Fillipe Mendes, Aguiar Pedro Henrique Soares, Assis Helena Cristina de, Lopes-Olhê Fabiane Carneiro, Mazzi-Chaves Jardel Francisco, Silva Ricardo Gariba, Cruz-Filho Antonio Miranda
Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, SP, Brazil.
University of Montes Claros (UNIMONTES), Montes Claros, MG, Brazil.
Braz Dent J. 2024 Dec 16;35:e246103. doi: 10.1590/0103-644020246103. eCollection 2024.
This study evaluated the bond strength (BS) of conventional, anatomized, adjustable, and CAD/CAM fiberglass post systems. Forty maxillary canine roots were weakened, endodontically treated, and divided into four groups (n=10). A slice from each of the three sections (cervical, middle, apical) of the root canal was subjected to the push-out test and the failure pattern was subsequently analyzed. The most apical slice was subjected to analysis of the cementation line thickness by scanning electron microscopy (SEM). Data regarding the BS and cementation line thickness were subjected to the Shapiro-Wilk normality test followed by the variance and Tukey tests. Data failure patterns were expressed as a percentage and submitted to the chi-square test. Conventional fiberglass posts had the lowest BD compared to the other fiberglass posts (p<0.05). All fiberglass posts exhibited a higher percentage of adhesive failures to dentin. The SEM demonstrated a thicker cementation line for the conventional post compared to the other groups (p<0.05), as well as gaps and voids in the cementing material. The anatomized, adjustable, and CAD/CAM milled fiberglass post systems demonstrated a superior BS and adaptation to the root dentin compared to the conventional fiberglass post.
本研究评估了传统型、解剖型、可调节型以及计算机辅助设计/计算机辅助制造（CAD/CAM）玻璃纤维桩系统的粘结强度（BS）。选取40颗上颌尖牙牙根进行根管预备并进行根管治疗，然后将其分为四组（每组n = 10）。对根管三个部位（颈部、中部、根尖部）的切片进行推出试验，并随后分析失败模式。对最根尖部的切片进行扫描电子显微镜（SEM）分析，以测量粘结线厚度。关于粘结强度和粘结线厚度的数据先进行夏皮罗-威尔克正态性检验，然后进行方差分析和Tukey检验。数据失败模式以百分比表示，并进行卡方检验。与其他玻璃纤维桩相比，传统玻璃纤维桩的粘结强度最低（p<0.05）。所有玻璃纤维桩对牙本质的粘结失败百分比均较高。扫描电子显微镜显示，与其他组相比，传统桩的粘结线更厚（p<0.05），并且粘结材料中存在间隙和孔隙。与传统玻璃纤维桩相比，解剖型、可调节型以及CAD/CAM铣削玻璃纤维桩系统表现出更高的粘结强度以及与牙根牙本质更好的适应性。
