Jensen Eric, Sayardoust Shariel
Centre for Oral Rehabilitation, Linköping, County Council of Östergötland, 581 86 Linköping, Sweden.
Department of Biomedical and Clinical Sciences, Linköping University, 581 83 Linköping, Sweden.
J Funct Biomater. 2024 Dec 22;15(12):389. doi: 10.3390/jfb15120389.
This study aimed to assess and compare the internal fit of custom-made posts and cores fabricated using digital impressions (DI) and conventional vinyl polysiloxane (VPS) impressions in restorative dentistry.
A typodont tooth model, simulating the anatomy of the root canal of a central incisor, was utilized for the study. Two groups were formed, Group A and Group B, and each group provided a total of 18 impressions of two types: DIs and VPS impressions. In Group A, posts and cores (PCs) were fabricated using Selective Laser Melting (SLM) from the DIs. Meanwhile, in Group B, conventionally cast (CC) PCs were created from the VPS impressions. Silicone replicas of the internal surfaces were produced, and measurements were made at seven different points for each group. A statistical analysis was performed to assess the differences in internal fit between the two impression techniques.
The results revealed a statistically significant difference in mean internal fit between Group A (DI and SLM) and Group B (VPS and CC), with Group A exhibiting a mean internal fit of 182.6 µm and Group B showing a mean of 205.9 µm. While both groups demonstrated considerable variability in internal fit measurements, the digital impression technique showed promise for achieving superior internal fit, with a significantly greater fit for measuring points on sides and the most apical part of the post for Group A. Variations were observed across different measuring points, emphasizing the impact of impression technique on specific regions within the tooth.
This study contributes to the growing body of knowledge in digital dentistry by highlighting the potential benefits of DIs in achieving a superior internal fit for custom-made PCs. Clinicians may consider the advantages of digital techniques to enhance the precision of their restorative procedures, although further research is warranted to evaluate the clinical impact of these findings.
本研究旨在评估和比较在口腔修复学中使用数字印模（DI）和传统乙烯基聚硅氧烷（VPS）印模制作的定制桩核的内部适合性。
本研究使用了一个模拟中切牙根管解剖结构的牙模型。将其分为A组和B组，每组均提供两种类型的共18个印模：数字印模和VPS印模。在A组中，使用选择性激光熔化（SLM）技术根据数字印模制作桩核（PC）。同时，在B组中，根据VPS印模制作传统铸造（CC）桩核。制作内表面的硅橡胶复制件，并对每组的七个不同点进行测量。进行统计分析以评估两种印模技术在内部适合性方面的差异。
结果显示，A组（数字印模和SLM）和B组（VPS印模和CC）之间的平均内部适合性存在统计学上的显著差异，A组的平均内部适合性为182.6 µm，B组为205.9 µm。虽然两组在内部适合性测量中均表现出相当大的变异性，但数字印模技术显示出实现更好内部适合性的潜力，A组在桩侧面和最根尖部分的测量点处的适合性明显更好。在不同测量点观察到了差异，强调了印模技术对牙齿内特定区域的影响。
本研究通过突出数字印模在实现定制桩核更好内部适合性方面的潜在益处，为数字牙科领域不断增长的知识体系做出了贡献。临床医生可能会考虑数字技术的优势以提高其修复程序的精度，尽管需要进一步研究来评估这些发现的临床影响。
