Factors Affecting Trueness of Intraoral Scans: An Update

Abstract

Background: Intraoral scanning (IOS) technologies have been constantly developed and improved. This systematic review aimed at assessing studies in the recent literature describing factors that influence the trueness of intraoral scans. Methods: Comparative in vitro and in vivo (i.e., interventional and observational) studies that quantitatively assessed the trueness of intraoral scans and that identified factors significantly affecting IOS trueness values were considered eligible for inclusion. The PUBMED and EMBASE databases were searched for articles published in the last two years (from February 2020 to February 2022). Data assessment and extraction were performed according to the guidelines of the PRISMA statement. Results: The present search strategy yielded 13 publications. An initial screening of the publications was performed using abstracts and key words, and after application of exclusion criteria, a total of nine studies were finally identified as eligible to be discussed. Several factors significantly affecting IOS were identified. Conclusions: Studies using current IOS technologies revealed that the device, scanning distance, operator experience, rescanning and post-processing scans, conditions of the preparations and presence of adjacent teeth are factors significantly affecting IOS trueness.

Patient Satisfaction with Anterior Interim CAD-CAM Rehabilitations Designed by CAD Technician versus Trained Dentist—A Clinical Preliminary Study

“…The first question aimed at obtaining a score for the satisfa tion with esthetics, whereas the second question assessed the comfort of the patient whe biting. At the beginning of the first appointment, each patient was given a questionnaire with two Likert scale questions [6], using a 10-point scale to assess their level of satisfaction with their current conventional temporary dental prostheses, following a previously described methodology [7]. The first question aimed at obtaining a score for the satisfaction with esthetics, whereas the second question assessed the comfort of the patient when biting.…”

“…All clinical and try-in procedures were performed by a dental clinician with more than 5 years of experience. After using each set of dental prostheses for 5 min, each patient was given a new questionnaire with the same two Likert scale questions [6] that were answered in the first appointment, but now to assess their level of satisfaction with each new set of CAD-CAM dental prostheses (groups DENT and CAD) [7]. Then, the set with the best outcomes was cemented with temporary cement (Tempbond NE, Kerr, Orange, CA, USA) as long-term temporary crowns to rehabilitate the patient.…”

“…This is carried out along with the identification of the dentist, technician and type of work performed, which are stored in the patient's file and used with the next software program of the workflow, which will be used to digitally design the restorations registered in the project. Such software interface also enables the possibility of importing and using the patient's photographs, which in turn can be integrated and superimposed with intraoral scans of the patient, and even cone-beamcomputed tomographic scans, if surgical procedures involving bone tissue are also part of the project [1,2,6].…”

The Impact of Adding Chitosan Nanoparticles on Biofilm Formation, Cytotoxicity, and Certain Physical and Mechanical Aspects of Directly Printed Orthodontic Clear Aligners

“…The accuracy of 3D images and ultimately produced aligners is multifactorial and influenced by the scanner type, operator skill, scanning field and technique [63], room lighting conditions [64], and the application of CAD/CAM spray [65]. The digitized offset might also modify surface reproducibility, defined as a non-customizable internal gap built by the software that is integrated to facilitate the sitting of an aligner [66].…”

Effect of angulation on the 3D trueness of conventional and digital implant impressions for multi-unit restorations

“…The accuracy of digital scans across different edentulous span lengths has been scrutinized, and it has been highlighted that a longer edentulous span led to more mistakes. 16 25 26 27 …”