Al-Rubaye Tabarak M, Elsubeihi Emad S
College of Dentistry, Ajman University, Ajman P.O. Box 346, United Arab Emirates.
Center of Medical and Bio-Allied Health Sciences Research, Ajman University, Ajman P.O. Box 346, United Arab Emirates.
Dent J (Basel). 2024 Sep 28;12(10):309. doi: 10.3390/dj12100309.
The aim of this study was to compare the fitting accuracy of custom-made metal posts and cores fabricated by half-digital and milling technique to that of conventional cast posts fabricated by direct technique.
Sixteen extracted single-rooted teeth were endodontically treated followed by post space preparation. A direct resin post and core pattern was made for each tooth and used for the fabrication of two posts (n = 16). Each post resin pattern was digitized with a laboratory scanner and used for the fabrication of a milled cobalt-chrome (Co-Cr) alloy post, while the direct resin pattern, after scanning, was cast in a Co-Cr alloy to produce a cast post. Each post was seated on its respective tooth and evaluated using microcomputed tomography. The following variables were evaluated: total space volume between the post and root canal, the volume and distance of the apical gap between each post and the remaining apical root canal filling, as well as the distance and surface area of the space between the post and lateral root canal wall at four determined points along the length of each post.
The results revealed that half-digital and milled posts had a statistically significantly higher total space volume ( < 0.05), apical gap volume ( < 0.02) and distance ( < 0.02), as well as a higher surface area of space between the post and root canal wall at the cervical area as compared to the cast post ( < 0.05).
This study demonstrated that the fitting accuracy of cast posts was more accurate than posts fabricated with half-digital and milling technique.
本研究旨在比较采用半数字化和铣削技术制作的定制金属桩核与采用直接技术制作的传统铸造桩的贴合精度。
选取16颗拔除的单根牙进行根管治疗，随后制备桩道。为每颗牙制作直接树脂桩核模型，并用于制作两根桩（n = 16）。每个桩树脂模型用实验室扫描仪进行数字化处理，用于制作铣削钴铬（Co-Cr）合金桩，而扫描后的直接树脂模型在Co-Cr合金中铸造以制作铸造桩。将每个桩就位在其相应的牙齿上，并用微型计算机断层扫描进行评估。评估以下变量：桩与根管之间的总空间体积、每个桩与剩余根尖根管充填物之间的根尖间隙体积和距离，以及沿每个桩长度的四个确定点处桩与侧根管壁之间的空间距离和表面积。
结果显示，与铸造桩相比，半数字化和铣削桩的总空间体积（< 0.05）、根尖间隙体积（< 0.02）和距离（< 0.02）在统计学上显著更高，并且在颈部区域桩与根管壁之间的空间表面积也更大（< 0.05）。
本研究表明，铸造桩的贴合精度比采用半数字化和铣削技术制作的桩更精确。
