The effect of different variables on push-out tests in 3D-printed oval and round-shaped root canals: a methodological study.

IF 1.4 4区医学 Q3 DENTISTRY, ORAL SURGERY & MEDICINE

Acta Odontologica Scandinavica Pub Date : 2025-02-13 DOI:10.2340/aos.v84.42958

Tuba Gok, Guzide Cankaya, Bilge Hakan Sen

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Abstract

Objective: This study aimed to evaluate the effect of slice thickness (ST), plunger size (PS), shape and region of the root canal on push-out tests using standardized artificial root canals.

Materials and methods: Two teeth with round and oval root canal anatomy were selected using cone beam computed tomography. Teeth were prepared, scanned with micro computed tomography and stereolithography data were obtained. Seventy-two round and 72 long oval artificial root canals were produced using a 3D printer. Root canals were obturated, then divided into two main groups (oval-round) and further divided into six subgroups (n = 12) according to ST (1, 1.5, and 2-mm) and PS (0.5, 0.75, and 1-mm). Push-out tests were performed and dislocation resistance values were calculated. The data were analyzed using the ANOVA two-way test (p = 0.05).

Results: Different STs showed similar results in oval canals (p > 0.05). 1-mm ST showed higher results in round canals (p < 0.05). There was a significant difference between 0.75 and 1-mm PSs (p < 0.05). Middle and coronal regions showed similar results in oval canals (p > 0.05), and coronal region showed lower results in round canals (p < 0.05).

Conclusion: ST, PS, root canal shape and region variables affected the dislocation resistance of core material in standardized root-filled canals.

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不同变量对3d打印椭圆和圆形根管推出试验的影响：一项方法学研究。

目的：探讨根管片厚度（ST）、柱塞尺寸（PS）、根管形状和根管面积对标准化人工根管推出试验的影响。材料与方法：选择根管解剖呈圆形和椭圆形的两颗牙进行锥形束计算机断层扫描。制备牙体，进行显微计算机断层扫描，获得立体光刻数据。使用3D打印机制作了72个圆形和72个椭圆形人工根管。根管封闭后，根据ST（1、1.5、2 mm）和PS（0.5、0.75、1 mm）分为2个主要组（卵圆形）和6个亚组（n = 12）。进行了推出试验，并计算了位错阻力值。资料采用双因素方差分析（p = 0.05）。结果：不同STs对卵圆管的影响相似（p < 0.05）。1 mm ST在圆管中表现出更高的结果（p < 0.05）。0.75 mm PSs与1 mm PSs比较差异有统计学意义（p < 0.05）。在椭圆管中，冠状区与中冠区结果相似（p < 0.05），而在圆形管中冠状区结果较低（p < 0.05）。结论：ST、PS、根管形状和根管区域变量影响标准化根管中核材料的抗脱位能力。

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