Intraoral Scans of Full Dental Arches: An In Vitro Measurement Study of the Accuracy of Different Intraoral Scanners

Abstract

The aim of this in vitro study was to evaluate the accuracy of different intraoral scanners (IOS), according to different scanning strategies and to the experience of the operator. Six IOS setups were used in this study. Ten scans of a complete epoxy-resin-made maxillary dental arch were performed with each IOS, using four different scanning techniques (manufacturer-suggested scanning strategy, cut-out rescan technique, simplified scanning technique, novel scanning technique). Scans were also performed by an expert operator in the field of digital dentistry. An operator with no experience in the field of intraoral scans performed 10 scans following each of the scanning strategy suggested by the manufacturer. The master model was scanned with an industrial high-resolution reference scanner to obtain a highly accurate digitized reference model. All the digital models were aligned with the reference model using a software aimed at comparing the STL files. A total of n = 300 scans were performed. Once the data were pooled, Medit i700 and Primescan obtained the best results in terms of both trueness and precision, showing no statistically significative differences (p > 0.05) to the first and the second scanning technique, Medit i700 scanner allowed to obtain the best values both in terms of trueness (24.4 ± 2.1 μm and 21.4 ± 12.9 μm, respectively) and precision compared to other IOS (23.0 ± 1.6 μm and 30.0 ± 18.0 μm, respectively). When considering the third scanning technique, Medit i700 recorded the best values in terms of trueness while Primescan recorded the best values in terms of precision (24.0 ± 2.7 μm and 26.8 ± 13.7 μm, respectively). When considering the two operators, significant differences between the two were found only with Medit i700 (p < 0.001). The examined IOS showed statistically significant differences in terms of trueness and precision. The used scanning strategy is a factor influencing the accuracy of IOS. Considering the expertise of the operators, clinically scanning strategies are not operative sensitive in terms of accuracy.

The effect of generation change on the accuracy of full arch digital impressions

“…When scanning the maxilla, starting from the occlusal to the buccal to the palatal surface is recommended, and when scanning the mandible, from the occlusal to the lingual to the buccal surface is preferred [ 36 – 39 ]. In the case of Medit IOS, the recommended scanning strategy starts at the occlusal surface (in both upper and lower jaws), and then the scanning should be continued on the oral surface and finally the vestibular side [ 40 ]. Using the Planmeca Emerald IOS, the scanning strategy is as follows (both in maxilla and mandible): the scanning starts on the occlusal surface from the molar region until the middle of the arch, after that the oral and then the vestibular surface is scanned.…”

A Systematic Review of the Use of Intraoral Scanning for Human Identification Based on Palatal Morphology

“…Different types of intraoral scanners are available, like the iTERO Element 5D plus, CEREC Primescan, Medit 1700, Omnicam, Dexis IS 3700, Trios 3, and 3Shape Trios 5 Wireless [ 40 , 41 , 42 , 43 ]. Overall, the highest precision outcomes were seen with iTero5D, Medit i700, and Omnicam [ 40 ].…”

“…Different types of intraoral scanners are available, like the iTERO Element 5D plus, CEREC Primescan, Medit 1700, Omnicam, Dexis IS 3700, Trios 3, and 3Shape Trios 5 Wireless [ 40 , 41 , 42 , 43 ]. Overall, the highest precision outcomes were seen with iTero5D, Medit i700, and Omnicam [ 40 ]. In another study, the authors reported that deviations in trueness and precision between these scanners would not be clinically relevant since the recorded accuracy values were of clinical acceptability.…”

Farklı İntraoral Tarayıcıların İmplant Ölçü Hassasiyeti Üzerindeki Etkisinin Değerlendirilmesi

“…Bu gelişmeler AİT'lerin konvansiyonel ölçüler kadar hassas olmasını sağlamıştır. 7 Dijital ağız içi tarama, yüksek hasta memnuniyeti, basitleştirilmiş üretim prosedürü ve maliyetlerdeki düşüş nedeniyle diş hekimliğinde popülerlik kazanmaktadır. 8,9 AİT'ler optik ölçü almak için kullanılırlar ve bir ışık demeti kullanarak diş arkının şekli/boyutu ve implantların konumu hakkında bilgi toplamaktadırlar.…”

“…30 AİT'lerin performanslarının, ağız içi ortamın değişkenlerini de taklit eden çalışmalarla değerlendirilmesi, bu cihazların potansiyel faydalarını ve sınırlılıklarını belirlememize yardımcı olacaktır. 7 Ayrıca, daha geniş bir tarayıcı yelpazesini içeren ve farklı ölçüm yöntemlerini inceleyen çalışmalar AİT'lerin etkili şekilde kullanmamızı sağlamaya yardımcı olabilir. Bu nedenle AİT'lerin dental implantların ölçüm hassasiyetlerinin incelenmesi için farklı marka cihazlar, implant sayısının artırılması ve implant açıları gibi faktörlerin de planlamaya katıldığı daha detaylı araştırmalara ihtiyaç duyulmaktadır.…”