Altinci Pinar, Dönmez Mustafa Borga, Çakmak Gülce, Al-Johani Hanan, Kahveci Çiğdem, Erkal Damla, Yilmaz Burak
Tikkurila Healthcare Center Dental Clinic, Vantaa and Kerava Wellbeing County, Vantaa, Finland.
Department of Prosthodontics, Faculty of Dentistry, Biruni University, Istanbul, Turkey; Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland.
J Dent. 2025 Jun;157:105731. doi: 10.1016/j.jdent.2025.105731. Epub 2025 Mar 31.
To evaluate the effects of margin configuration and pulp chamber depth on the fabrication trueness and internal fit of resin-based endocrowns fabricated with additive (AM) and subtractive manufacturing (SM).
Four mandibular first molar typodonts prepared with butt joint or 1 mm-wide shoulder margins and 2 mm or 4 mm pulp chamber depths were digitized to design reference endocrowns. These designs were used to fabricate endocrowns with AM (Crowntec [AM-CT], FREEPRINT Crown [AM-FP], Tera Harz TC80DP [AM-GR]) or SM (Tetric CAD [SM-TC]) (n = 7). Surface deviations (external, intaglio, and marginal root mean square, RMS) and triple scan protocol (average gap) were used for digital analyses. Data were analyzed with generalized linear models (α = 0.05).
Intaglio RMS was affected by the interaction of all main factors, while all surface deviations were affected by material type-margin configuration interaction. Material type-pulp chamber depth interaction affected intaglio RMS and average gaps, whereas margin configuration-pulp chamber depth interaction affected all outcomes, except intaglio RMS (P ≤ 0.001). AM-GR mostly led to lower intaglio and marginal RMS, while SM-TC mostly led to lower external RMS (P ≤ 0.022). SM-TC endocrowns with 4-mm depth had the highest and AM-GR endocrowns with 4-mm depth mostly had lower average gaps (P ≤ 0.024).
The interactions among the main factors affected the trueness of the tested endocrowns. However, no clear trend emerged that would highlight any subgroup as having the highest trueness. Most endocrowns demonstrated clinically acceptable internal gaps.
Tested additively manufactured resin-based endocrowns had favorable internal adaptation. However, they may require more chairside adjustments on external surfaces compared to tested subtractively manufactured endocrowns.
评估边缘形态和髓腔深度对采用增材制造（AM）和减材制造（SM）技术制作的树脂基嵌体冠的制作精度和内部适合性的影响。
对4个制备有对接或1毫米宽肩台边缘以及2毫米或4毫米髓腔深度的下颌第一磨牙模型进行数字化处理，以设计参考嵌体冠。这些设计用于通过增材制造（Crowntec [AM-CT]、FREEPRINT Crown [AM-FP]、Tera Harz TC80DP [AM-GR]）或减材制造（Tetric CAD [SM-TC]）制作嵌体冠（n = 7）。使用表面偏差（外部、凹面和边缘均方根，RMS）和三次扫描协议（平均间隙）进行数字化分析。数据采用广义线性模型进行分析（α = 0.05）。
凹面RMS受所有主要因素的交互作用影响，而所有表面偏差受材料类型 - 边缘形态交互作用影响。材料类型 - 髓腔深度交互作用影响凹面RMS和平均间隙，而边缘形态 - 髓腔深度交互作用影响所有结果，但凹面RMS除外（P≤0.001）。AM-GR大多导致较低的凹面和边缘RMS，而SM-TC大多导致较低的外部RMS（P≤0.022）。4毫米深度的SM-TC嵌体冠平均间隙最高，而4毫米深度的AM-GR嵌体冠大多具有较低的平均间隙（P≤0.024）。
主要因素之间的相互作用影响了测试嵌体冠的精度。然而，没有出现明确的趋势表明任何亚组具有最高的精度。大多数嵌体冠显示出临床上可接受的内部间隙。
测试的增材制造树脂基嵌体冠具有良好的内部适合性。然而，与测试的减材制造嵌体冠相比，它们可能需要在外部表面进行更多的椅旁调整。
