Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou, China.
School/Hospital of Stomatology, Zhejiang Chinese Medical University, Hangzhou, China.
Clin Implant Dent Relat Res. 2023 Jun;25(3):481-489. doi: 10.1111/cid.13211. Epub 2023 Apr 25.
To evaluate the performance of the indirect technique in peri-implant soft tissue contour duplication after the delivery procedure in the anterior maxilla.
Patients with single implant-supported fixed restorations in the anterior maxilla were recruited. For the impression procedure, an intraoral scan was acquired by both the direct and the indirect techniques. For the delivery procedure, implants were randomly allocated into one of the two groups according to the approaches of digital impression preceding definite crown fabrication (A-direct technique; B-indirect technique) and were scanned again after the definite crown delivery. The stereolithography files were superimposed to analyze changes in peri-implant soft tissue contour after the delivery procedure. The main outcomes were dimensional deviations of peri-implant mucosa, and the secondary outcome was differences in the pink esthetic score (PES).
A total of 20 implants that underwent the complete workflow were included. After the delivery procedure, significant deviations in palatal tissue thickness between the provisional and definite crowns were observed in Group A but these were absent in Group B. Additionally, deviations in labial thickness (0.27 ± 0.12 mm vs. 0.08 ± 0.09 mm) and palatal thickness (0.17 ± 0.15 mm vs. 0.03 ± 0.08 mm), and labial volume of soft tissue (1.87 ± 0.94 mm vs. 0.75 ± 0.74 mm ) in Group A were significantly higher than those in Group B. No significant differences in PES were found.
The indirect technique of scanning the provisional crown can more accurately duplicate the peri-implant soft tissue contour than the direct technique, resulting in a smaller deviation of the soft tissue in the delivery procedure.
评估在前上颌直接和间接印模技术在种植体周围软组织轮廓复制中的性能。
纳入上颌前牙单牙种植体支持固定修复患者。对于印模过程，通过直接和间接技术采集口内扫描。对于输送过程，根据数字化印模在前牙固定修复制作之前的方法（A-直接技术；B-间接技术）将种植体随机分配到两组中，然后在最终修复体输送后再次扫描。将立体光刻文件叠加，以分析输送后种植体周围软组织轮廓的变化。主要结果是种植体周围粘膜的尺寸偏差，次要结果是粉红色美学评分（PES）的差异。
共纳入 20 个完成整个工作流程的种植体。输送后，在 A 组中观察到临时冠和最终冠之间腭侧组织厚度有显著偏差，但在 B 组中则没有。此外，A 组的唇侧厚度（0.27±0.12mm 比 0.08±0.09mm）和腭侧厚度（0.17±0.15mm 比 0.03±0.08mm）以及唇侧软组织体积（1.87±0.94mm 比 0.75±0.74mm）的偏差均明显高于 B 组。PES 无显著差异。
与直接技术相比，扫描临时冠的间接技术可以更准确地复制种植体周围软组织轮廓，从而在输送过程中软组织的偏差更小。
