STOMATOLOGY EDU JOURNAL

DENTAL MATERIALS

Ex vivo digital comparison of four impression techniques using an industrial laser scanner

DOI: https://doi.org/10.25241/stomaeduj.2022.9(1).art.2

Abstract

Introduction The aim of the study was to compare different impression techniques used for fixed prosthodontics.
Methodology A master cast with prepared abutments was created from polymethyl-methacrylate (PMMA). A high-resolution industrial scanner was used to create a virtual reference model. Four different impressions were made, three with polyvinyl-siloxane (PVS) (n = 10 for each): one-step putty-wash (1SPW), two-step putty-wash prepared with an escape channel (2SPW-Ch), two-step putty-wash with a polyethylene spacer foil (2SPW-Fo), and one with polyether monophasic technique (MP) from the PMMA model and digitized with an industrial scanner. The stereolithographic (STL) files of the impressions (n = 40) were exported. Each file was compared to the reference using the Geomagic Verify software. Six points were assigned to enable virtual calliper measurement of tooth diameters and distances of varying sizes within the arch.
Results In the case of die diameters, the deviation from the mould ranged from 31.84 to 180.64 µm. At the stump diameter level, the MP and 1SPW techniques showed significantly more minor differences than the 2SPW-Ch, and the MP was significantly more accurate than the 2SPW-Fo. At medium distance, the deviation ranged from 42.74 to 136.47 µm. Therefore, MP was found to be significantly more accurate than 2SPW-Ch. When examining the long distance, the difference was between 162.62 and 348.85 µm. The MP and 1SPW impression techniques proved significantly more accurate than the 2SPW-Ch technique for long distances.
Conclusions With both simultaneous techniques, significantly more true results were achieved than with the two-step techniques.

Keywords

Dental Impression Technique; Scanning of the Impression; Monophase; One-Step Putty-Wash; Two-Step Putty-Wash.

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The Stomatology Edu Journal (Stoma Edu J) is one of the first Green Open Access journals in the field of dental medicine, publishing well-established authors, but equally committed to encouraging early career researchers and professionals alike to publish their work after a non-partisan, objective, double-blind rigorous peer-reviewed process. The Stomatology Edu Journal (Stoma Edu J) is a Green Open Access journal accessible for free on the Internet, hence no processing, peer review fees or article publishing charges payable by the author are required. A Green Open Access (GOA) journal means that all content is freely available to the user or his/her institution without charge. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles in this journal without asking prior permission from the publisher or the author. Our aim is to publish in the shortest possible time frame and ensure the rapid dissemination of your work via our journal page, but also through our indexing partners…(read more)

STATEMENT

STOMATOLOGY EDU JOURNAL (Stoma Edu J) is a new international dental journal whose main purpose is to inform researchers, educators, graduates, postgraduates and practitioners about the latest trends in the field, which followed, would bring immediate and lasting benefits to the patients; and about opinions of the most authorized specialists on what is best in current practice, for the good of both, patient and dentist.
STOMATOLOGY EDU JOURNAL (Stoma Edu J) is a peer-reviewed, open access international dental journal to be database indexed, meant to contribute to the development and completion of the medical training of practitioners as Dr. Greene Vardiman Black stated: “the professional man has no right to be other than a continual student”.
Open access journal, means that all content is freely available without charge to the user or his/her institution. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles in this journal without asking prior permission from the publisher or the author.