OBJECTIVES To assess the accuracy of intraoral digital impressions for gingival contour captured in the esthetic zone in vivo. MATERIAL AND METHODS Five participants with full upper dentition were recruited. For each participant, three scans were taken using two intraoral scanning (IOS) systems (3Shape TRIOS Color, TRC; CEREC Omnicam, OC) respectively; three conventional impressions (CIs) were taken using vinyl polysiloxane materials. The CIs of all participants were casted and then digitized with a model scanner (IScan D103i, Imetric). Precision was evaluated by superimposing three repeated STL datasets per participant within each group and calculating the (90th-10th)percentile/2 values. The CIs were the reference for evaluating the level of system error of the two IOS systems from the true value. Digital models from CI and each IOS group were superimposed and (mean positive deviation-mean negative deviation)/2[mean negative deviation, mean positive deviation] were calculated to assess trueness level of the two IOS systems. RESULTS For the soft tissue acquisition, precision results of each group were 45.10 ± 12.54 μm in TRC, 66.04 ± 13.46 μm in OC, and 63.66 ± 17.19 in CI (TRC vs OC, p < 0.001; TRC vs CI, p = 0.001; OC vs CI, p = 0.66). Trueness results were 80.12 ± 8.69[- 112.10 ± 9.88, 48.13 ± 13.79] μm in TRC and 82.70 ± 8.85[- 121.41 ± 15.40, 43.98 ± 11.86] μm (p > 0.05). CONCLUSIONS In dentate situations, the two tested IOS systems achieved a clinically satisfying accuracy for capturing gingival contour in anterior maxilla, with a comparable or superior precision to the CI. TRC achieved a similar trueness and a higher precision level compared with OC. CLINICAL RELEVANCE Intraoral digital impressions could be a recommended method for recording 3-dimensional gingival contour in the esthetic zone.

中文翻译：

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评估口内数字印模以获得美学区域的牙龈轮廓：准确性结果。

目的评估口内数字印模在体内美学区域捕获牙龈轮廓的准确性。材料与方法招募了五名完全上牙的参与者。对于每个参与者，分别使用两个口内扫描（IOS）系统（3Shape TRIOS Color，TRC； CEREC Omnicam，OC）进行了三个扫描；使用乙烯基聚硅氧烷材料获得了三个常规印模（CI）。铸造所有参与者的CI，然后使用模型扫描仪（IScan D103i，Imetric）将其数字化。通过将每个组中每个参与者的三个重复STL数据集进行叠加并计算（90th-10th）percentile / 2值来评估精度。CI是从真实值评估两个IOS系统的系统错误级别的参考。叠加了CI和每个IOS组的数字模型，并计算了（平均正偏差-平均负偏差）/ 2 [平均负偏差，平均正偏差]，以评估两个IOS系统的真实性水平。结果对于软组织采集，每组的精确度结果分别为：TRC为45.10±12.54μm，OC为66.04±13.46μm，CI为63.66±17.19（TRC vs OC，p <0.001； TRC vs CI，p = 0.001； OC vs CI，p = 0.66）。真相结果在TRC中为80.12±8.69 [-112.10±9.88，48.13±13.79]μm和82.70±8.85 [-121.41±15.40，43.98±11.86]μm（p> 0.05）。结论在齿状情况下，两个经过测试的IOS系统在捕获上颌前牙龈轮廓方面达到了临床上令人满意的精度，其精度与CI相当或更高。与OC相比，TRC的真实性和精确度更高。临床相关性口内数字化印记可能是在审美区域记录3维牙龈轮廓的推荐方法。