Accuracy of photogrammetry, intraoral scanning, and conventional impression techniques for complete-arch implant rehabilitation: an in vitro comparative study

Abstract Background To compare the accuracy of photogrammetry, intraoral scanning and conventional impression techniques for complete-arch implant rehabilitation. Methods A master cast containing 6 implant abutment replicas was fabricated. Group PG: digital impressions were taken 10 times using a photogrammetry system; Group IOS: intraoral scanning was performed to fabricate 10 digital impressions; Group CNV: splinted open-tray impression technique was used to fabricate 10 definitive casts. The master cast and conventional definitive casts were digitized with a laboratory reference scanner. For all STL files obtained, scan bodies were converted to implant abutment replicas using a digital library. The accuracy of a digitizer was defined by 2 main parameters, trueness and precision. "Trueness" was used to describe the deviation between test files and reference file, and "precision" was used to describe the closeness between test files. Then, the trueness and precision of three impression techniques were evaluated and statistically compared (α = 0.05). Results The median trueness was 24.45, 43.45 and 28.70 μm for group PG, IOS and CNV; Group PG gave more accurate trueness than group IOS (P < 0.001) and group CNV (P = 0.033), group CNV showed more accurate trueness than group IOS (P = 0.033). The median precision was 2.00, 36.00 and 29.40 μm for group PG, IOS and CNV; Group PG gave more accurate precision than group IOS (P < 0.001) and group CNV (P < 0.001), group CNV showed more accurate precision than IOS (P = 0.002). Conclusions For complete-arch implant rehabilitation, the photogrammetry system showed the best accuracy of all the impression techniques evaluated, followed by the conventional impression technique, and the intraoral scanner provided the least accuracy.

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Conventional Vs Digital Impressions: Acceptability, Treatment Comfort and Stress Among Young Orthodontic Patients

The Open Dentistry Journal ◽

10.2174/1874210601812010118 ◽

2018 ◽

Vol 12 (1) ◽

pp. 118-124 ◽

Cited By ~ 19

Author(s):

Alessandro Mangano ◽

Matteo Beretta ◽

Giuseppe Luongo ◽

Carlo Mangano ◽

Francesco Mangano

Keyword(s):

State Anxiety ◽

The State ◽

Anxiety Scale ◽

Previous Experience ◽

Intraoral Scanner ◽

Impression Material ◽

Impression Technique ◽

Digital Impressions ◽

Orthodontic Patients ◽

Conventional Impression

Objective: The objective of the present study was to compare patients’ acceptability, comfort and stress with conventional and digital impressions. Materials and Methods: Thirty young orthodontic patients (15 males and 15 females) who had no previous experience of impressions were enrolled in this study. Conventional impressions for orthodontic study models of the dental arches were taken using an alginate impression material (Hydrogum®, Zhermack Spa, Badia Polesine, Rovigo, Italy). Fifteen days later, digital impressions of both arches were acquired using an intraoral scanner (CS3600®, Carestream Dental, Rochester, NY, USA). Immediately after impression taking, patients’ acceptability, comfort and stress were measured using two questionnaires and the State anxiety scale. Results: Data showed no difference in terms of anxiety and stress; however, patients preferred the use of digital impressions systems instead of conventional impression techniques. Alginate impressions resulted as fast as digital impressions. Conclusions: Digital impressions resulted the most accepted and comfortable impression technique in young orthodontic patients, when compared to conventional techniques.

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Elastic deformation of the mandibular jaw revisited—a clinical comparison between digital and conventional impressions using a reference

Clinical Oral Investigations ◽

10.1007/s00784-021-03777-z ◽

2021 ◽

Author(s):

Alexander Schmidt ◽

Leona Klussmann ◽

Maximiliane A. Schlenz ◽

Bernd Wöstmann

Keyword(s):

Statistical Analysis ◽

Elastic Deformation ◽

Clinical Relevance ◽

Mouth Opening ◽

Reference Structure ◽

Intraoral Scanner ◽

Digital Impressions ◽

Normal Vectors ◽

Mandibular Deformation ◽

Conventional Impression

Abstract Objectives Due to the partly strongly differing results in the literature, the aim of the present study was to investigate a possible deformation of the mandible during mouth opening using an intraoral scanner (IOS) and a conventional impression for comparison with a reference aid. Materials and methods Four steel spheres were reversibly luted in the mandibular (n = 50) with a metallic reference aid at maximum mouth opening (MMO). Two digital impressions (Trios3), at MMO and at slightly mouth opening SMO and a conventional impression (Impregum), were taken as the measuring accuracy of the reference structure was already known. Difference between MMO-SMO for digital impressions and deviations between digital and conventional (SMO) were calculated. Furthermore, the angle between the normal vectors of two constructed planes was measured. Statistical analysis was performed with SPSS25. Results Deviations for linear distances ranged from −1 ± 3 μm up to 17 ± 78 μm (digital impressions, MMO-SMO), from 19 ± 16 μm up to 132 ± 90 μm (digital impressions, SMO), and from 28 ± 17 μm up to 60 ± 52 μm (conventional impressions, SMO). There were no significant differences for digital impressions (MMO-SMO), and there were significant differences between the conventional and digital impressions at SMO. Conclusions Based on the results of the present study, no mandibular deformation could be detected during mouth opening with regard to the digital impressions. The results were rather within the measuring tolerance of the intraoral scanner. Clinical relevance Based on the present study, no deformation of the mandibular during mouth opening could be observed at the level previously assumed. Therewith related, dental techniques related to a possible mandibular deformation therefore should be reconsidered.

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Digital Impression taking for Maxillary Full-Arch Restoration with Immediate Loading. A Case Report.

Journal of Oral Implantology ◽

10.1563/aaid-joi-d-20-00117 ◽

2021 ◽

Author(s):

Jesús Peláez Rico ◽

Jorge Cortés-Bretón Brinkmann ◽

María Carrión Martín ◽

Mabel Albanchez González ◽

Celia Tobar Arribas ◽

...

Keyword(s):

Acrylic Resin ◽

Digital Impression ◽

Immediate Loading ◽

Clinical Report ◽

Intraoral Scanner ◽

Intraoral Scanning ◽

Digital Impressions ◽

Removable Prosthesis ◽

And Function

The aim of this clinical report is to describe a maxillary full-arch implant supported restoration with immediate loading performed by means of an entirely digital workflow with photogrammetric system and intraoral scanning. A female patient with an edentulous maxillary arch attended the dental clinic seeking a maxillary fixed restoration. After treatment planning, six implants were placed using a surgical splint fabricated digitally by intraoral scanning of her previous removable prosthesis. Multi-unit abutments were fitted and two digital impressions were taken, one with a photogrammetric system for determining implant positions, and the other with an intraoral scanner for soft tissue registration. The acrylic resin structure of the immediate prosthesis was milled and placed within 8 hours of implant surgery. This provisional structure fitted correctly and provided adequate esthetics and function. Radiographic and clinical follow-up after 24 months observed adequate implant evolution.

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Clinical Acceptability of the Internal Gap of CAD/CAM PD-AG Crowns Using Intraoral Digital Impressions

BioMed Research International ◽

10.1155/2016/7065454 ◽

2016 ◽

Vol 2016 ◽

pp. 1-6

Author(s):

Tae-Gyung Kim ◽

Sungtae Kim ◽

Hyunmin Choi ◽

Jae-Hoon Lee ◽

Jae-Hong Kim ◽

...

Keyword(s):

Digital Impression ◽

Digital Impressions ◽

Significant Difference ◽

Cad Cam ◽

Cast Group ◽

Group 10 ◽

Internal Gap ◽

Conventional Impression ◽

Palladium Silver

The purpose of this study was to compare the internal gap between CAD/CAM palladium-silver crowns and cast gold crowns generated from intraoral digital versus conventional impressions and to determine the clinical acceptability. Nickel-chrome master dies were made from the prepared resin tooth with the conventional impression method (n=40). For ICC (Intraoral, CAD/CAM) group, 10 intraoral digital impressions were made, and 10 CAD/CAM crowns of a PD-AG (palladium-silver) machinable alloy were generated. For IC (Intraoral, Cast) group, 10 gold crowns were cast from ten intraoral digital impressions. For CCC (Conventional, CAD/CAM) group, 10 CAD/CAM PD-AG crowns were made using the conventional impression method. For CC (Conventional, Cast) group, 10 gold crowns were fabricated from 10 conventional impressions. One hundred magnifications of the internal gaps of each crown were measured at 50 points with an optical microscope and these values were statistically analyzed using a two-way analysis of variance (α=0.05). The internal gap of the intraoral digital impression group was significantly larger than in the conventional impression group (P<0.05). No significant difference was observed between the CAD/CAM group and the cast group (P>0.05). Within the limitations of this in vitro study, crowns from intraoral digital impressions showed larger internal gap values than crowns from conventional impressions.

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Accuracy of Conventional and Digital Methods for Obtaining Dental Impressions and 3D Printed Models

10.21203/rs.3.rs-66906/v1 ◽

2020 ◽

Author(s):

CAIO CÉSAR DIAS Resende ◽

Tiago Augusto Quirino Barbosa ◽

Guilherme Faria Moura ◽

Lucas Nascimento Tavares ◽

Fabio Antonio Piola Rizzante ◽

...

Keyword(s):

3D Models ◽

3D Printer ◽

Test Results ◽

Intraoral Scanner ◽

Tukey Test ◽

Digital Impressions ◽

3D Printed ◽

Digital Methods ◽

Similar Accuracy ◽

Conventional Impression

Abstract Background: Different sizes of arch could influence in digital methods to obtaining dental impressions and 3D models. The purpose of this study was to evaluate and compare the accuracy of two intra-oral scanners and conventional impression methods for the fabrication of working casts. Methods: Conventional impressions of a reference cast were obtained. Digital impressions were obtained with two intra-oral scanners: Cerec Omnicam (CO) and 3Shape Trios (ST). The obtained digital stereolithographic casts were printed on Zenith D 3D printer. The reference cast and fabricated casts were scanned with a bench top scanner and saved in STL format. All STL records were analyzed in specific software: complete arch (CA), partial arch (PA) and prepared teeth area (PT). One-way and two-way analyses of variance were performed to compare the accuracy, followed by the Tukey test. Results: No significant intergroup differences in trueness and precision were observed for the two intra-oral scanners. 3D printed casts had the lowest trueness when complete arch was analyzed and differed statistically from the stone cast. For complete arch precision, stone cast presented better results, however statistically different only from the CO. Conclusions: The two intraoral scanner systems had similar accuracy. Stone casts had higher trueness than 3D printed casts for CA. For CA precision, 3D printed cast presented similar results to the stone cast.

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Computerized Casts for Orthodontic Purpose Using Powder-Free Intraoral Scanners: Accuracy, Execution Time, and Patient Feedback

BioMed Research International ◽

10.1155/2018/4103232 ◽

2018 ◽

Vol 2018 ◽

pp. 1-8 ◽

Cited By ~ 25

Author(s):

Maria Francesca Sfondrini ◽

Paola Gandini ◽

Maurizio Malfatto ◽

Francesco Di Corato ◽

Federico Trovati ◽

...

Keyword(s):

Computer Software ◽

Digital Impression ◽

Processing Times ◽

Patient Feedback ◽

Intraoral Scanning ◽

Digital Impressions ◽

Titanium Dioxide Powder ◽

Dioxide Powder ◽

Digital Scanning ◽

Conventional Impression

Introduction. Intraoral scanners allow direct images of oral situation, with fewer steps than conventional impressions. The purpose of this study was to compare the accuracy of digital impressions, traditional impressions, and digitalization of full-arch gypsum models, to evaluate timing of different methods and finally to study perception of patients about conventional and digital impression techniques. Methods. Dental arches of fourteen patients were evaluated by alginate impression, titanium dioxide powder-free intraoral scanning (Trios, 3Shape), and digitalization obtained from gypsum models using the same scanner. Conventional and digital techniques were evaluated through measurements (lower and upper arch anteroposterior length, lower and upper intercanine distance, and lower and upper intermolar distance) with a caliber for analogic models and using a computer software for digital models (Ortho Analyzer, Great Lakes Orthodontics). In addition, chairside and processing times were recorded. Finally, each patient completed a VAS questionnaire to evaluate comfort. Statistical analyses were performed with ANOVA and Tukey tests for accuracy measurements and paired t-test for times and VAS scores. Significance was predetermined at P<0.05. Results. The measurements obtained with intraoral scanning, gypsum models after conventional impression, and digitalized gypsum models were not significantly different. Both chairside and processing times of digital scanning were shorter than the traditional method. VAS reporting patients comfort were significantly higher when evaluating digital impression. Conclusions. Intraoral scanners used for orthodontic applications provide useful data in clinical practice, comparable to conventional impression. This technology is more time efficient than traditional impression and comfortable for patients. Further evolution with more accurate and faster scanners could in future replace traditional impression methods.

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Learning curve of digital intraoral scanning – an in vivo study

10.21203/rs.3.rs-19321/v2 ◽

2020 ◽

Author(s):

Ivett Róth ◽

Alexandra Czigola ◽

Gellért Levente Joós-Kovács ◽

Magdolna Dalos ◽

Péter Hermann ◽

...

Keyword(s):

Learning Curve ◽

Dental Students ◽

First Impressions ◽

In Vivo Study ◽

Intraoral Scanner ◽

Scanning Time ◽

Intraoral Scanning ◽

Digital Impressions ◽

The Difference

Abstract Background: The spread of digital technology in dentistry poses new challenges and goals for dentists. The aim of the present in vivo study was to determine the learning curve of intraoral scanning described by (1) scanning time and (2) image number (count of images made by intraoral scanner during scanning process). Methods: Ten dental students of Semmelweis University, took part in the study. Dental students took digital study impressions using 3Shape Trios 3® (3Shape, Copenhagen, Denmark) intraoral scanning device. Each student took 10 digital impressions on volunteers (for standardization the first and the last volunteers was the same for each student). The inclusion criteria of volunteers were full dentition (except missing third molar) and no prosthetic- restorative treatment. Digital impression taking was preceded by a lecture consisting of two parts: theoretical education and practical training. Digital impressions were taken of the upper and lower arches, and the bite was recorded according to the manufacturer's instructions. Total scanning time and image number of intraoral scanning were recorded. Results: The difference of scanning time between the first and the tenth digital impressions was significant (p=0.007). The average scanning time of first impressions was 23 min 9 sec, for tenth impressions it was 15 min 28 sec. The difference between scanning time of the first and the tenth impressions was 7 min 41 sec. The average image number of the first impressions was 1964.5, for the tenth impressions it was 1468.6. The difference between number of images of the first and the tenth impressions was 495,9. The curve of image number show decreasing tendency first, then has a trough around the sixth measurement, and rises. Conclusion: Based on our results there was association between the sequential number of measurements and the outcome variables. The scanning time decreased because of the repetitive use of intraoral scanner. The image number first showed decreasing tendency and after sixth measurement it increased, there is no consistent decline in mean scanning picture. Scanning time decreased because the students move the scanning tip faster as result of practice. Shorter scanning times are accompanied by poorer coverage quality, the operator has to correct by adding extra images represented by the curve of image numbers which turning into increasing tendency after the sixth measurement. Trial registration: The permission for this study was given by the University Ethics Committee of Semmelweis University (SE TUKEB number: 61/2016).

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Comparison of CBCT with different voxel sizes and intraoral scanner for detection of periodontal defects: an in vitro study

Dentomaxillofacial Radiology ◽

10.1259/dmfr.20190197 ◽

2020 ◽

Vol 49 (5) ◽

pp. 20190197

Author(s):

Murat Icen ◽

Kaan Orhan ◽

Çiğdem Şeker ◽

Gediz Geduk ◽

Fethiye Cakmak Özlü ◽

...

Keyword(s):

Diagnostic Accuracy ◽

Alveolar Bone ◽

Periodontal Diseases ◽

In Vitro Study ◽

Intraoral Scanner ◽

Voxel Size ◽

Periodontal Tissues ◽

Anterior Teeth ◽

Intraoral Scanning

Objectives: This study aimed to compare the diagnostic accuracy of cone beam CT (CBCT) units with different voxel sizes with the digital intraoral scanning technique in terms of the detection of periodontal defects. Methods and materials: The study material comprised of 12 dry skulls with maxilla and mandible. Artificial defects were created on teeth separately using burs randomly on dry skulls. In total 46 dehiscences, 10 fenestrations, 17 furcations, 12 wall defects and 13 without periodontal defect were used in the study. Each tooth with and without defects was imaged at various vertical angles using each of the following modalities: a Veraviewepocs 3D R100 CBCT device and a 3D Shape TRIOSㄾ Color P13 Shade Intraoral Scanner. Results: The κ values for interobserver agreement between observers ranged between 0.29 and 0.86 for the CBCT 10 × 8 cm field of view (FOV) with 0,160 mm3 voxel size; 0.35 and 1 for the CBCT 8 × 8 cm FOV with 0,125 mm3 voxel size; and 0.30 and 1 of intraoral scans. The κ values for detecting defects on anterior teeth were the least, following premolar and molar teeth both CBCT and intraoral scanning. Conclusions: Smaller voxel sizes and smaller CBCT FOV has the highest sensitivity and diagnostic accuracy for detecting various periodontal defects among the scanner modalities examined. Advances in knowledge: Adequate evaluation of the condition of the alveolar bone and periodontal tissues is important for the diagnosis, treatment, and prognosis of periodontal disease. Limited examination methods, such as palpation, inspection, and periodontal probe examination, may provide insufficient information for the diagnosis of periodontal diseases.

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Accuracy of Digital and Conventional Full-Arch Impressions in Patients: An Update

Journal of Clinical Medicine ◽

10.3390/jcm9030688 ◽

2020 ◽

Vol 9 (3) ◽

pp. 688 ◽

Cited By ~ 8

Author(s):

Alexander Schmidt ◽

Leona Klussmann ◽

Bernd Wöstmann ◽

Maximiliane Amelie Schlenz

Keyword(s):

Three Dimensional ◽

Reference Dataset ◽

Coordinate Measurement ◽

Long Span ◽

Impression Technique ◽

Digital Impressions ◽

Scan Data ◽

Conventional Models ◽

Conventional Impression ◽

Transfer Accuracy

The aim of this clinical study was to update the available data in the literature regarding the transfer accuracy (trueness/precision) of four current intraoral scanners (IOS) equipped with the latest software versions and to compare these data with conventional impressions (CVI). A metallic reference aid served as a reference dataset. Four digital impressions (Trios3Cart, Trios3Pod, Trios4Pod, and Primescan) and one CVI were investigated in five patients. Scan data were analyzed using three-dimensional analysis software and conventional models using a coordinate measurement machine. The transfer accuracy between the reference aid and the impression methods were compared. Differences with p < 0.05 were considered to be statistically significant. Overall, mean ± standard deviation (SD) transfer accuracy ranged from 24.6 ± 17.7 µm (CVI) to 204.5 ± 182.1 µm (Trios3Pod). The Primescan yielded the lowest deviation for digital impressions (33.8 ± 31.5 µm), followed by Trios4Pod (65.2 ± 52.9 µm), Trios3Cart (84.7 ± 120.3 µm), and Trios3Pod. Within the limitations of this study, current IOS equipped with the latest software versions demonstrated less deviation for short-span distances compared with the conventional impression technique. However, for long-span distances, the conventional impression technique provided the lowest deviation. Overall, currently available IOS systems demonstrated improvement regarding transfer accuracy of full-arch scans in patients.

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CONVENTIONAL VS DIGITAL IMPRESSION TECHNIQUE FOR MANUFACTURING OF THREE-UNIT ZIRCONIA BRIDGES: CLINICAL TIME EFFICIENCY

Journal of IMAB - Annual Proceeding (Scientific Papers) ◽

10.5272/jimab.2021272.3765 ◽

2021 ◽

Vol 27 (2) ◽

pp. 3765-3771

Author(s):

Kiril Gogushev ◽

◽

Metodi Abadjiev ◽

Keyword(s):

Soft Tissues ◽

Digital Impression ◽

Controlled Clinical Trial ◽

Dental Arch ◽

Manufacturing Companies ◽

Impression Technique ◽

Impression Materials ◽

Digital Impressions ◽

Time Required ◽

Conventional Impression

Introduction: Taking an impression of the oral cavity, which accurately recreates the prosthetic field, the surrounding hard dental and soft tissues, is one of the main and most important stages in the process of making any fixed prosthetic restoration. In modern prosthetic dentistry, impressions taken with the help of polyether and vinyl polysiloxane impression materials are common. Digital impressions eliminate some of the steps of conventional impression techniques and save clinical time. Aim: The aim of this article is to compare the clinical time in digital and conventional impression techniques from a whole dental arch using a controlled clinical trial. Material and methods: The present study includes 36 patients from Varna who need prosthetic treatment with fixed 3-unit bridge construction. For all participants, the conventional impression technique was performed first and one week later - the digital one. All clinical manipulations related to the implementation of the two impression techniques were performed according to the instructions of the manufacturing companies by the same specialist dentist. Results: In all participants, the time required to perform the digital impression technique is significantly less than that of the conventional impression technique. Conclusion: The digital impression technique has proven to be more efficient in terms of clinical time required for its implementation than the conventional impression technique.

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