Background: Digital impressions are becoming increasingly favored among dentists and dental technicians in Sweden. The knowledge about the use of digital impression techniques is important to improve the clinical work for dentists and dental technicians. However, the conventional impression techniques are still widely used although the digital impression techniques have become more preferred nowadays. Aim: The aim of this survey study was to investigate the use of digital impressions among dentists and dental technicians in Sweden. Pros and cons with the digital impression techniques were investigated as well as the areas in which it is used.  Method: Questionnaires were sent by post to dentists and dental technicians with different questions suited to each profession. The questionnaires were distributed to four regions representing the southern, western, eastern, and northern parts of the country. The questions contained information about the use of digital impressions.   Results: Fixed prosthodontics and the production of mouth guards are areas in which the digital impression techniques are most frequently used. Dentists believed that precision, time saving impression procedure and patient comfort were the greatest advantages with the digital impression techniques. Dental technicians thought that time, cost, possibility to reuse digital impressions and the minimization of the sources of error were the greatest advantages with the digital impression techniques.    Conclusions: The digital impression techniques are widely used among dentists and dental technicians, specifically within fixed prosthodontics and the production of mouth guards.

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Bakgrund. En gyllene standard för att bestämma noggrannheten för intraorala scannrarexisterar inte. Intraorala scannrars prestanda som ges av olika leverantörer är inte fulltjämförbara. Det finns ett behov att standardisera och ta fram oberoende försöksupplägg för att kunna jämföra intraorala scannrar.Mål. Målet med studien var att beskriva och utvärdera en ny metod för att bestämmanoggrannheten av intraorala scannrar genom ett standardiserat in vitro testförsök och attanvända metoden för att beräkna noggrannheten på en kommersiell intraoral scanner.Material och metod. SP Sveriges tekniska forskningsinstitut definierade dimensionerna avett sfäriskt testobjekt. Sfären besprutades med titanoxid och skannades 12 gånger med enkommersiell intraoral scanner. Scanningarna utvärderades med två metoder. Manuell metod: sfärens diameter uppmättes 12 gånger i ett första mjukvaruprogram för varje scanning genom att justera ett tvärsnittsplan. Automatisk metod: 12 nominella diametrar beräknades från ett andra mjukvaruprogram. Noggrannheten beräknades för varje testmetod och jämfördes.Resultat. Referensmätning: den definierade diameter var 4,9991±0,0001mm. Manuell metod: riktigheten var 25μm och precisionen var 10μm. Medelprecisionen inom scanningar var 4μm. Automatisk metod: Riktigheten var 26μm och precisionen var 11μm. Alla testvärden uppvisade stark statistisk deviation från referensvärdet, men väl inom ett kliniskt acceptabelt intervall.Slutsatser. Inom den här in vitro-studiens begränsningar, kan den beskrivna,standardiserade metoden användas manuellt eller med den automatiska funktionen Fittingsphere för att beräkna noggrannheten för intraorala scannrar. Fler studier på mer komplexa objekt behöver utföras. Dessutom uppvisade den intraorala scannern (TRIOS) hög riktighet och precision, jämförbar eller bättre än traditionella avtrycksmetoder inom tandvården. / AbstractBackground. There is no gold standard for determining the accuracy of intraoral scanners. The performances of intraoral scanners given by different manufacturers are not fully comparable. There is a need for standardized and independent test setups to enable the comparison of intraoral scanners.Objectives. The study’s aims were to describe and evaluate a new method for determining the accuracy of any intraoral scanner by means of a standardized geometrical in vitro test and to use this method for determining the accuracy of a commercial intraoral scanner.Material and methods. The Technical Research Institute of Sweden defined the dimensions of a spherical test object. The sphere was spray-coated with TiO2 and scanned 12 times with a commercial intraoral scanner. The scans where evaluated using two methods. Manual method: The diameter of the sphere was measured 12 times for each scan in a software application by adjusting a cross-sectional plane. Automatic method: 12 nominal diameters were obtained with a software application. The accuracy was calculated for each test method and compared. Results. Reference measurement: The defined diameter was 4.9991±0.0001mm. Manual method: Trueness was 25 µm and precision was 10 µm. Mean precision within scans was 4 µm. Automatic method: Trueness was 26 µm and precision was 11 µm. All test values showed sharp significant deviations from the reference value but were well within range of clinical acceptance.Conclusions. Within the limitations of this in vitro study, the standardized in vitro test described can be used manually or with the automatic function Fitting Sphere for determining the accuracy of intraoral scanners. Further studies need to be performed on more complex objects. The commercial intraoral scanner (TRIOS) demonstrates a high level of trueness and precision which is comparable with or better than that shown with traditional impression methods.

Introduction : L’empreinte numérique et l’impression 3D dans le domaine dentaire ont permis de perfectionner plusieurs techniques de confection d’appareils orthodontiques afin de les rendre plus efficaces et d’améliorer le confort pour le patient. L’objectif de cette étude était d’obtenir une corrélation entre les dimensions des molaires et la taille des bagues orthodontiques à l’aide de modèles numériques. Méthode : Les dimensions bucco-linguales, mésio-distales ainsi que la circonférence ont été mesurées sur 193 dents à l’aide du logiciel d’analyse OrthoAnalyzer™. Des corrélations de Pearson univariées ont été effectuées afin de déterminer les variables indépendantes présentant des corrélations statistiquement significatives avec la taille de la bague orthodontique. Une régression simple a ensuite été utilisée afin d’obtenir un modèle prédisant la taille des bagues orthodontiques à partir des variables indépendantes retenues. Résultats : La circonférence moyenne des premières molaires maxillaires les sujets de sexe masculin (36,55 ± 1,96 mm) est plus grande que pour les sujets de sexe féminin (35,37 ± 1.49 mm), la différence étant statistiquement significative (p <0.001). Une corrélation de R=0.952 a été obtenue entre la mesure de la circonférence des molaires et la taille de la bague orthodontique pour le groupe avec séparateurs. Conclusion : Il existe une corrélation entre la mesure de la circonférence de la première molaire maxillaire permanente et la taille de la bague orthodontique qui permet de prédire à 90% la taille de celle-ci. / Introduction: Digital impressions and 3D printing in dentistry have drastically changed the fabrication process of orthodontic appliances, making it more efficient and improving the patient’s comfort. The objective of this study wasto obtain a correlation between the dimensions of the molars and the size of the orthodontic bands using a digital model. Method: The buccolingual, mesiodistal, and circumference dimensions were measured on 193 teeth using the OrthoAnalyzer™ software. Univariate Pearson correlations were performed to determine the independent variables with statistically significant correlations with orthodontic band sizes. A simple regression was then used to obtain a model governing the size of orthodontic bands from the independent variables retained. Results: The mean circumference of maxillary first molars for male subjects (36.55 ± 1.96 mm) was greater than for female subjects (35.37 ± 1.49 mm), the difference being statistically significant (p <0.001). A correlation of R=0.952 was obtained between the circumference of the molars and the size of the orthodontic bands for the group with separators. Conclusion: There was a correlation between the circumference of the first permanent maxillary molar and the size of the orthodontic band, making it possible to predict the size of the band with 90% accuracy.

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