Local accuracy of actual intraoral scanning systems for single-tooth preparations in vitro

Background: with the emergence of technological innovations in the dental industry, one emerging trend has been the intraoral digitizing of patients by using intraoral scanning systems. Compared to taking conventional impressions, the use of intraoral scanners (IOS) is suitable for capturing direct optical impressions, helping to improve diagnostic efficacy, save time, reduce patient discomfort, and simplify clinical procedures. Intraoral scanning systems appear to have a high potential for providing guidance on proper standards of care. However, one main disadvantage is breathing and saliva secretion, which causes deviations, interfering with the applicability and accuracy of the optical impression. The aim of this study was to compare the validity and accuracy of three commercially available intraoral scanners, performing an analysis exploiting a wet model. Methods: an in vitro experimental study of four permanent teeth (two molars and two premolars) on the accuracy of copings obtained by subgingival preparations was performed, using an oral wet environment model. Two hundred and forty digital impressions were produced from three digital scanners using four samples. Descriptive analysis was performed using mean, standard deviation, and median. ANOVA and F-tests were performed to assess the amount of variability between the groups. For statistical analysis a 95% significance level was chosen. Results: all differences between groups were statistically significant. Conclusions: the present data implicate a huge impact of the oral biological fluids on the accuracy of digital impression to corresponding images, implying a failure of accurate impression under wetness conditions.

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Multivariate Assessment of Marginal Fit of Three Types of Dental Crowns Using Three Scanning Systems for CAD-CAM Technology - in vitro Pilot Study

Materiale Plastice ◽

10.37358/mp.18.3.5033 ◽

2018 ◽

Vol 55 (3) ◽

pp. 376-379

Author(s):

Smaranda Buduru ◽

Anca Mesaros ◽

Cristian Culcitchi ◽

Marioara Moldovan ◽

Doina Prodan ◽

...

Keyword(s):

In Vitro Study ◽

Marginal Fit ◽

Dental Crowns ◽

Intraoral Scanning ◽

Different Types ◽

Cad Cam ◽

Scanning Systems ◽

Conventional Impression ◽

Hybrid Ceramic

The objective of this in-vitro study was to compare if there are any differences in the marginal fit of crowns fabricated by CAD/CAM technique. We used three different types of materials (two types of polymethylmetacrylate (PMMA) provided by two different manufacturers and one type of hybrid ceramic) and three different types of impressions: intraoral scanning, model scanning and conventional impression scanning. The crowns were subsequently measured with an electronic microscope at 1000X. Our results showed better results for the hybrid ceramic. The differences between the PMMA were not significant. There were no statistic differences with the ANOVA analysis between the scanning methods. Best combination in terms of marginal fit was found with hybrid ceramic and intraoral scanning.

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A Method for in vitro Studies on Fluoride Uptake in Enamel Using Single Tooth Surfaces

Caries Research ◽

10.1159/000260218 ◽

1976 ◽

Vol 10 (5) ◽

pp. 370-378 ◽

Cited By ~ 4

Author(s):

E. Kirkegaard ◽

I.J. Møller ◽

Skov Jensen

Keyword(s):

In Vitro Studies ◽

Fluoride Uptake ◽

Single Tooth ◽

Tooth Surfaces

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Influence of adjacent teeth on the accuracy of intraoral scanning systems for class II inlay preparation

Journal of Esthetic and Restorative Dentistry ◽

10.1111/jerd.12824 ◽

2021 ◽

Author(s):

Jae‐Hoon Kim ◽

Sung‐Ae Son ◽

Hyeonjong Lee ◽

Yeon‐Jee Yoo ◽

Seoung‐Jin Hong ◽

...

Keyword(s):

Class Ii ◽

Intraoral Scanning ◽

Scanning Systems

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A Comparative Analysis of Master Casts Obtained using Different Surface Treatments on Impression Copings for Single Tooth Implant Replacement -An In vitro Study

JOURNAL FOR CLINICAL AND DIAGNOSTIC RESEARCH ◽

10.7860/jcdr/2017/28372.10501 ◽

2017 ◽

Author(s):

Surbhi Abrol

Keyword(s):

Comparative Analysis ◽

In Vitro Study ◽

Surface Treatments ◽

Vitro Study ◽

Single Tooth ◽

Single Tooth Implant

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Personalized Dental Medicine: Impact of Intraoral and Extraoral Clinical Variables on the Precision and Efficiency of Intraoral Scanning

Journal of Personalized Medicine ◽

10.3390/jpm10030092 ◽

2020 ◽

Vol 10 (3) ◽

pp. 92

Author(s):

César Martínez-Rodríguez ◽

Junco-Plana Patricia ◽

Ortega-Aranegui Ricardo ◽

Iglesias-Linares Alejandro

Keyword(s):

T Test ◽

Surface Material ◽

Ambient Light ◽

Lower Incisor ◽

Second Molar ◽

Intraoral Scanning ◽

Time Scanning ◽

Interobserver Error ◽

External Light Source

(1) Objectives: The aim is to measure the influence of different intraoral (crowding and molar inclination) and extraoral (surface material and ambient light) conditions on the efficacy and efficiency of intraoral scanning. (2) Methods: In a controlled in vitro experimental study, the samples were divided into six groups showing two types of intraoral conditions—lower incisor crowding (groups 1–3) and lower molar mesial tipping (groups 4–6). Each modified model was replicated using three types of materials with different light-absorption properties (n = 18 models). Each sample was scanned 30 times at light intensities of 0.0, 1800, or 3600 l×, yielding 3240 scans. Scanning efficiency (digital acquisition; scanning chair-time; and scanning failures) and scanning efficacy (undetected volume) were assessed using virtual superimpositions and Mecano Equate software. The intra- and interobserver error and reliability of the method were calculated and data analyses were performed using the t-test, paired t-test, and one-way analysis of variance (p < 0.05). (3) Results: Digital acquisition was influenced by the degree of crowding and molar inclination (p < 0.05). The scanning surface material affected the efficacy and efficiency, which were lower with a calcium sulfate hemihydrate A modified compound scanning surface (p < 0.05). Higher intensities of ambient light in the scanning room were associated with reduced scanning efficacy (p < 0.05). Moreover, the scanner showed greater amounts of undetected volume as the degrees of crowding and mesial tipping of the lower second molar increased over 25°, with mean error values of 0.97 mm3 and 1.12 mm3, respectively. (4) Conclusions: For scanning procedures employing digital acquisition, differences in the degrees of crowding and mesial tipping of the lower second molar, scanning surface material, and external light source intensity influence the efficacy and efficiency of the scanning procedures, scanning chair-time, scanning failures, and undetected volume.

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An in vitro Study to Compare the Accuracy of Master Cast Fabricated by Three Different Transfer Techniques for Single Tooth Implant Replacement using Open and Close Tray

International Journal of Oral Implantology and Clinical Research ◽

10.5005/jp-journals-10012-1143 ◽

2015 ◽

Vol 6 (3) ◽

pp. 85-93

Author(s):

Rahul Nagrath ◽

Manesh Lahori ◽

Yatharth Bhatia ◽

Anubhav Srivastav

Keyword(s):

In Vitro Study ◽

Vitro Study ◽

Single Tooth ◽

Single Tooth Implant

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Use of a novel suction cervical retractor for intrauterine device insertion: a pilot feasibility trial

BMJ Sexual & Reproductive Health ◽

10.1136/bmjsrh-2017-200031 ◽

2018 ◽

Vol 45 (1) ◽

pp. 47-53

Author(s):

David K Turok ◽

Rebecca G Simmons ◽

Benjamin Cappiello ◽

Lori M Gawron ◽

Jane Saviers-Steiger ◽

...

Keyword(s):

Ex Vivo ◽

Intrauterine Device ◽

Feasibility Trial ◽

Novel Device ◽

Pain Scores ◽

Single Tooth ◽

Lower Pain ◽

Stage 1 ◽

And Control

IntroductionThe Bioceptive suction cervical retractor (SCR) is a novel device that can replace the standard single-tooth tenaculum to place traction on the cervix. A feasibility trial was conducted on the device for intrauterine device (IUD) placement.MethodsOur three-stage feasibility process began with Stage 1, where the device was tested on in-vitro and ex-vivo samples. In Stage 2, 10 women received their IUD using the device. In Stage 3, a feasibility trial, we randomly assigned 25 consenting women to receive their IUD using either the Bioceptive SCR or the standard single-tooth tenaculum. In Stages 2 and 3, we collected pain scores using an electronically adapted 100-point visual analogue scale (VAS) at eight timepoints during and after the insertion procedure, as well as satisfaction and acceptability measures. The primary outcome was the pain score after attaching the SCR or tenaculum (VAS 3). Wilcoxon rank sum tests compared pain scores between devices.ResultsIn Stage 2, pain scores with the SCR were lower than historical controls with the single-tooth tenaculum. In Stage 3, the median VAS 3 pain scores were 31 and 57 for the intervention and control groups, respectively. The differences in pain scores were not statistically significant but the trend was to lower pain scores with the intervention. Reported patient satisfaction with the SCR device was 80% in Stage 2% and 90% in Stage 3.ConclusionsThe Bioceptive SCR has potential as an atraumatic alternative to standard cervical retractor devices for gynaecological procedures. These findings can guide point estimates for future clinical studies.Trial registrationNCT02283463.

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