PurposeTo evaluate the dimensional stability over time of additively manufactured surgical templates, fabricated by different resins, and stored by different methods.Materials and MethodsUsing a 3D printer with DLS technology and two different resins (Surgical Guide (SG)‐WhipMix and Key Guide (KG)‐KeystoneIndustries), 96 surgical guides were additively manufactured. The guides were stored in three different environments: directly exposed to sunlight (S1), in normal interior room conditions (S2), and in darkness (S3). The guides were digitally scanned immediately after fabrication and post‐processing, and after 1, 3, and 6 months of storage. For each group, the mean deviation of the root mean square (RMS) between guide's intaglio surface, as well as the axial deviation between sleeves' housings were calculated.ResultsThe mean axial variations of angular axis deviation of sleeves' housings ranged between 0.09° and 3.99°. The mean deviation of the RMS discrepancy in guide's intaglio ranged from 0.1 to 0.18 mm. Variations were significant (p < 0.001) only for the S1 group and only for SG material. After 3 months, an additional storage time of 3 months did not have any further effect on dimensional stability.ConclusionsWithin the limitations of the present study, storage time of a surgical guide for up to 3 months after manufacturing, as well as printing material can significantly affect surgical guide's dimensional stability, when they are exposed to direct or indirect sunlight conditions. Storage of guides in a dark environment is recommended in order to avoid an additional source of error in computer‐guided surgery workflows.

中文翻译：

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储存条件和时间对 3D 打印手术导板尺寸稳定性的影响：体外研究


目的评估由不同树脂制造并通过不同方法存储的增材制造手术模板随时间的尺寸稳定性。材料和方法使用采用 DLS 技术的 3D 打印机和两种不同的树脂（手术导板 (SG)-WhipMix 和 Key Guide (KG)） )‐KeystoneIndustries)，增材制造了 96 个手术导板。这些指南被存放在三种不同的环境中：直接暴露在阳光下（S1）、正常室内条件下（S2）和黑暗中（S3）。指南在制造和后处理后以及存储 1、3 和 6 个月后立即进行数字扫描。对于每组，计算了导轨凹面之间的均方根（RMS）平均偏差以及套筒外壳之间的轴向偏差。结果套筒外壳的角轴偏差的平均轴向变化范围在0.09°和0.09°之间。 3.99°。导轨凹版的RMS差异的平均偏差范围为0.1至0.18毫米。仅 S1 组和 SG 材料的变化显着 (p < 0.001)。 3 个月后，额外保存 3 个月不会对尺寸稳定性产生任何进一步影响。 结论 在本研究的限制范围内，手术导板以及打印材料在制造后最多保存 3 个月可以显着影响尺寸稳定性。当手术导板暴露在直接或间接阳光条件下时，会影响其尺寸稳定性。建议将导板存放在黑暗环境中，以避免计算机引导手术工作流程中出现额外的错误源。