scholarly journals Impact of Aging on the Accuracy of 3D-Printed Dental Models: An In Vitro Investigation

2020 ◽  
Vol 9 (5) ◽  
pp. 1436 ◽  
Author(s):  
Tim Joda ◽  
Lea Matthisson ◽  
Nicola U. Zitzmann
Keyword(s):  
Reference Model ◽  
In Vitro Study ◽  
Deviation Analysis ◽  
Fixed Dental Prosthesis ◽  
In Vitro Investigation ◽  
Dental Models ◽  
3D Printed ◽  
Level Of Significance ◽  
The Impact

The aim of this in vitro study was to analyze the impact of model aging on the accuracy of 3D-printed dental models. A maxillary full-arch reference model with prepared teeth for a three-unit fixed dental prosthesis was scanned ten times with an intraoral scanner (3Shape TRIOS Pod) and ten models were 3D printed (Straumann P-Series). All models were stored under constant conditions and digitized with a desktop scanner after 1 day; 1 week; and 2, 3, and 4 weeks. For accuracy, a best-fit algorithm was used to analyze the deviations of the abutment teeth (GFaI e.V Final Surface®). Wilcoxon Rank Sum Tests were used for comparisons with the level of significance set at α = 0.05. Deviation analysis of the tested models showed homogenous intragroup distance calculations at each timepoint. The most accurate result was for 1 day of aging (3.3 ± 1.3 µm). A continuous decrease in accuracy was observed with each aging stage from day 1 to week 4. A time-dependent difference was statistically significant after 3 weeks (p = 0.0008) and 4 weeks (p < 0.0001). Based on these findings, dental models should not be used longer than 3 to 4 weeks after 3D printing for the fabrication of definitive prosthetic reconstructions.

scholarly journals A Proposed In Vitro Methodology for Assessing the Accuracy of Three-Dimensionally Printed Dental Models and the Impact of Storage on Dimensional Stability

2021 ◽  
Vol 11 (13) ◽  
pp. 5994
Author(s):  
Li Hsin Lin ◽  
Joshua Granatelli ◽  
Frank Alifui-Segbaya ◽  
Laura Drake ◽  
Derek Smith ◽  
...  
Keyword(s):  
Dimensional Stability ◽  
Reference Model ◽  
Three Dimensional ◽  
Posterior Region ◽  
Digital Light Processing ◽  
Dental Models ◽  
3D Printed ◽  
T1 And T2 ◽  
The Impact

The objective of this study was to propose a standardised methodology for assessing the accuracy of three-dimensional printed (3DP) full-arch dental models and the impact of storage using two printing technologies. A reference model (RM) comprising seven spheres was 3D-printed using digital light processing (MAX UV, MAX) and stereolithography (Form 2, F2) five times per printer. The diameter of the spheres (n = 35) represented the dimensional trueness (DT), while twenty-one vectors (n = 105) extending between the sphere centres represented the full-arch trueness (FT). Samples were measured at two (T1) and six (T2) weeks using a commercial profilometer to assess their dimensional stability. Significant (p < 0.05) contraction in DT occurred at T1 and T2 with a medium deviation of 108 µm and 99 µm for MAX, and 117 µm and 118 µm for F2, respectively. No significant (p > 0.05) deviations were detected for FT. The detected median deviations were evenly distributed across the arch for MAX at <50 µm versus F2, where the greatest error of 278 µm was in the posterior region. Storage did not significantly impact the model’s DT in contrast to FT (p < 0.05). The proposed methodology was able to assess the accuracy of 3DP. Storage significantly impacted the full-arch accuracy of the models up to 6 weeks post-printing.

Additive vs. Subtractive CAD/CAM Procedures in Manufacturing of the PMMA Interim Dental Crowns. A Comparative in vitro Study of Internal Fit

2020 ◽  
Vol 71 (1) ◽  
pp. 405-410
Author(s):  
Kamel Earar ◽  
Alexandru Andrei Iliescu ◽  
Gabriela Popa ◽  
Andrei Iliescu ◽  
Ioana Rudnic ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Dimensional Accuracy ◽  
Vitro Study ◽  
Dental Crowns ◽  
S 100 ◽  
Cad Cam ◽  
Dental Models ◽  
3D Printed ◽  
Internal Fit

CAD/CAM procedures are increasingly used to the manufacturing of 3D-designed PMMA interim dental crowns. The aim of this in vitro study was to compare the internal fit of interim PMMA crowns fabricated by subtractive versus additive CAD/CAM procedures. Starting from a Co-Cr CAD/CAM master abutment model, 20 standardized dental models of dental stone were done by double impression technique. Subsequently two groups of interim PMMA interim crowns, each of them having 10 specimens, were CAM obtained either by milling or 3D printing, using Exocad software package, milling machine Rolland DWX-50, and the 3D printer MoonRay S 100 respectively. An electronic digital caliper Powerfix Profi+ was used for measurements of the chrome cobalt abutment and crowns inner diameter in 4 directions (mesial-distal gingival, buccal-lingual gingival, mesial-distal occlusal, and buccal-lingual occlusal). The null hypothesis that the internal dimensional accuracy of interim PMMA crowns fabricated by DLP additive method would not be different compared to those obtained by milling procedure was rejected since the printed PMMA interim crowns were more accurate. This study concluded that the milled PMMA interim crowns show larger internal dimensional variations than the 3D printed ones. However, the fit variation among interim crowns fabricated by both procedures was statistically non significant, so that both CAM technologies may be equally used in manufacturing process.

scholarly journals Is There a Significant Difference in Accuracy of Four Intraoral Scanners for Short-Span Fixed Dental Prosthesis? A Comparative In Vitro Study

2021 ◽  
Vol 11 (18) ◽  
pp. 8280
Author(s):  
Anca Jivănescu ◽  
Adrian Bara ◽  
Andrei-Bogdan Faur ◽  
Raul Nicolae Rotar
Keyword(s):  
Data Analysis ◽  
In Vitro Study ◽  
Digital Impression ◽  
Precision Data ◽  
Fixed Partial Denture ◽  
Fixed Dental Prosthesis ◽  
Significant Difference ◽  
Short Span ◽  
Level Of Significance

Is the accuracy of the older generation of IOSs an impediment for obtaining a quality intraoral digital impression? The aim of this study was to evaluate the differences in accuracy between four intraoral scanners (two of the latest IOSs and two older IOSs) in the scenario of a short span fixed partial denture, and to determine if these differences have a major impact on the quality of the final digital impression. Four intraoral scanners: Cerec PrimeScan, Medit i700, Cerec Omnicam and Planmeca PlanScan and one laboratory scanner were used in this study. The scanned data were processed with the help of Geomagic Control X, a metrology software. For the statistical data analysis, the level of significance was set as 0.05 (α = 0.05). The Medit i700 group displayed the best level of trueness with the median value of 23.25 µm, PrimeScan group with a median of 25.55 µm, Omnicam group with a median of 32.3 µm and the PlanScan group which displayed the lowest level of trueness with a median value of 75.8 µm. From the precision data analysis, it was concluded that the PrimeScan group showed the best results, followed by Medit i700, Omnicam and the PlanScan group which showed the lowest precision. Even if there are some significant differences in accuracy between old and new IOSs, in the in vitro scenario of short span dental prostheses, the accuracy values were within the clinically acceptable range and may present important clinical implications.

scholarly journals Influence of Preparation Design, Marginal Gingiva Location, and Tooth Morphology on the Accuracy of Digital Impressions for Full-Crown Restorations: An In Vitro Investigation

2020 ◽  
Vol 9 (12) ◽  
pp. 3984
Author(s):  
Selina A. Bernauer ◽  
Johannes Müller ◽  
Nicola U. Zitzmann ◽  
Tim Joda
Keyword(s):  
In Vitro Study ◽  
Arch Model ◽  
Finish Line ◽  
Posterior Teeth ◽  
Mean Values ◽  
Digital Impressions ◽  
In Vitro Investigation ◽  
Abutment Teeth ◽  
3D Printed

(1) Background: Intraoral optical scanning (IOS) has gained increased importance in prosthodontics. The aim of this in vitro study was to analyze the IOS accuracy for treatment with full crowns, considering possible influencing factors. (2) Methods: Two tooth morphologies, each with four different finish-line designs for tooth preparation and epi- or supragingival locations, were digitally designed, 3D-printed, and post-processed for 16 sample abutment teeth. Specimens were digitized using a laboratory scanner to generate reference STLs (Standard Tessellation Language), and were secondary-scanned with two IOS systems five times each in a complete-arch model scenario (Trios 3 Pod, Primescan AC). For accuracy, a best-fit algorithm (Final Surface) was used to analyze deviations of the abutment teeth based on 160 IOS-STLs compared to the reference STLs (16 preparations × 2 IOS-systems × 5 scans per tooth). (3) Results: Analysis revealed homogenous findings with high accuracy for intra- and inter-group comparisons for both IOS systems, with mean values of 80% quantiles from 20 ± 2 μm to 50 ± 5 μm. Supragingival finishing lines demonstrated significantly higher accuracy than epigingival margins when comparing each preparation (p < 0.05), whereas tangential preparations exhibited similar results independent of the gingival location. Morphology of anterior versus posterior teeth showed slightly better results in favor of molars in combination with shoulder preparations only. (4) Conclusion: The clinical challenge for the treatment with full crowns following digital impressions is the location of the prospective restoration margin related to the distance to the gingiva. However, the overall accuracy for all abutment teeth was very high; thus, the factors tested are unlikely to have a strong clinical impact.

scholarly journals Variables Affecting the Accuracy of Implant Master Casts: An In Vitro Pilot Study

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Matthias Karl ◽  
Victor Palarie
Keyword(s):  
Reference Model ◽  
Misfit Strain ◽  
Strain Development ◽  
Impression Materials ◽  
Lower Strain ◽  
In Vitro Investigation ◽  
Bone Level ◽  
Level Of Significance ◽  
Implant System

Impression and master cast accuracy have been identified as being the major determinants of superstructure fit in implant-supported restorations. The goal of this in vitro investigation was to determine the effects of different transfer components, impression materials, disinfection, storage time, and stone type on master cast accuracy. Following impression making from a reference model with two internal-hex bone-level implants and master cast fabrication (eight experimental groups; n = 5), a bar-type measurement device equipped with a strain gauge was fixed on all master casts while strain development was recorded. Statistical analysis was performed applying ANOVA and paired t-tests with the level of significance set at α = 0.05. The transfer components with plastic sleeves caused maximum misfit strain which was significantly greater as compared to click (P = 0.02) and open tray transfer components (P = 0.00). No significant effect on master cast accuracy was recorded for the parameters impression material, impression disinfection, and storage of impressions or casts. Lower strain development was observed in casts poured in type 3 stone as compared to casts poured in type 4 stone (P = 0.01). For the bone-level implant system considered here, the great levels of accuracy could be achieved using pick-up impressions with either click or open tray impression components.

scholarly journals Impact of Various Irrigating Agents on Root Fracture: An in vitro Study

2016 ◽  
Vol 17 (8) ◽  
pp. 659-662 ◽  
Author(s):  
Pradnya Nikhade ◽  
Sukriti Tiwari ◽  
C Sudarshan ◽  
Priyadarshini Shetty ◽  
Naveen K Gupta
Keyword(s):  
Citric Acid ◽  
Fracture Resistance ◽  
Ethylenediaminetetraacetic Acid ◽  
In Vitro Study ◽  
Study Groups ◽  
Test Machine ◽  
Root Fracture ◽  
Level Of Significance ◽  
The Impact

ABSTRACT Introduction Irrigating solutions are used for cleaning and removing dentinal debris, and the other remains from pulpal space during biomechanical preparation. Therefore, we evaluated the impact of various irrigating agents on root fracture at 5-minute time exposure. Materials and methods We sectioned 60 permanent maxillary premolars with fully formed root structures transversely maintaining the root length of approximately 14 mm. Five study groups were made comprising ethylenediaminetetraacetic acid (EDTA), cetrimide, citric acid, and so on as various irrigating agents. A universal force test machine was used to calculate the force which was enough to fracture each root. Analysis of variance (ANOVA) test was used to access the level of significance. Results About 10% citric acid solution as an irrigating agent showed minimal fracture opposing results, whereas 10% EDTA solution showed the maximum fracture resistance of root portion. Clinical significance Selection of suitable EDTA concentration that has minimal adverse effect on the mechanical properties of the tooth is very important for the successful management of tooth fracture. Conclusion About 10% EDTA provided the highest fracture resistance, necessitating the use of irrigating solution in root canal therapy (RCT). Further research with higher and different study groups is required to search for more efficient irrigating solution to improve the outcome of RCT. How to cite this article Tiwari S, Nikhade P, Chandak M, Sudarshan C, Shetty P, Gupta NK. Impact of Various Irrigating Agents on Root Fracture: An in vitro Study. J Contemp Dent Pract 2016;17(8):659-662

scholarly journals Accuracy of Guided Implant Surgery in the Edentulous Jaw Using Desktop 3D-Printed Mucosal Supported Guides

2021 ◽  
Vol 10 (3) ◽  
pp. 391
Author(s):  
Rani D’haese ◽  
Tom Vrombaut ◽  
Geert Hommez ◽  
Hugo De Bruyn ◽  
Stefan Vandeweghe
Keyword(s):  
In Vitro Study ◽  
Angular Deviation ◽  
Implant Surgery ◽  
Implant Position ◽  
Surgical Guides ◽  
Negative Effect ◽  
Bone Level ◽  
3D Printed ◽  
Implant Alignment

Purpose: The aim of this in vitro study is to evaluate the accuracy of implant position using mucosal supported surgical guides, produced by a desktop 3D printer. Methods: Ninety implants (Bone Level Roxolid, 4.1 mm × 10 mm, Straumann, Villerat, Switzerland) were placed in fifteen mandibular casts (Bonemodels, Castellón de la Plana, Spain). A mucosa-supported guide was designed and printed for each of the fifteen casts. After placement of the implants, the location was assessed by scanning the cast and scan bodies with an intra-oral scanner (Primescan®, Dentsply Sirona, York, PA, USA). Two comparisons were performed: one with the mucosa as a reference, and one where only the implants were aligned. Angular, coronal and apical deviations were measured. Results: The mean implant angular deviation for tissue and implant alignment were 3.25° (SD 1.69°) and 2.39° (SD 1.42°) respectively, the coronal deviation 0.82 mm (SD 0.43 mm) and 0.45 mm (SD 0.31 mm) and the apical deviation 0.99 mm (SD 0.45 mm) and 0.71 mm (SD 0.43 mm). All three variables were significantly different between the tissue and implant alignment (p < 0.001). Conclusion: Based on the results of this study, we conclude that guided implant surgery using desktop 3D printed mucosa-supported guides has a clinically acceptable level of accuracy. The resilience of the mucosa has a negative effect on the guide stability and increases the deviation in implant position.

scholarly journals In vitro Remote Aspiration Embolectomy for the Treatment of Acute Ischemic Stroke

2018 ◽  
Vol 8 (1) ◽  
pp. 20-26
Author(s):  
Asim Rizvi ◽  
Sean T. Fitzgerald ◽  
Kent D. Carlson ◽  
Dan Dragomir Daescu ◽  
Waleed Brinjikji ◽  
...  
Keyword(s):  
Case Series ◽  
In Vitro Study ◽  
Side Branch ◽  
Collateral Branch ◽  
Proximal Internal Carotid Artery ◽  
Glass Model ◽  
Catheter Tip ◽  
Inner Diameter ◽  
The Impact

Background: “Remote aspiration,” using suction from the proximal internal carotid artery (ICA) to open terminus occlusions, has been reported in small case series. However, it remains unclear whether remote aspiration is feasible for middle cerebral artery occlusions in the setting of potential inflow from communicating arteries. We performed an in vitro study to assess whether suction applied at various locations proximal to an occlusion could successfully aspirate the clot. Methods: A glass model of 4 mm inner diameter (ID) with 1 mm distal narrowing and 2 mm side branch to simulate a communicating artery was constructed. A proximal side branch was placed to simulate inflow from the proximal ICA. The impact of three different-sized catheters (ID 0.088, 0.070, and 0.056 in) on histologically different (red blood cell-cell rich, fibrin-rich, and mixed) clot analogues was tested with the catheter tip placed remotely either distal or proximal to the collateral branch. Aspiration was attempted with (1) open system (flow in both the ICA and the collateral branch, (2) flow arrest with open collateral (no flow in the ICA, but flow in the collateral branch), and (3) closed system (no flow in either the ICA or the collateral branch). The outcome was success or failure of remote aspiration. Results: For the 0.088-in catheter, remote aspiration was successful in all conditions. For the 0.070-in catheter, remote aspiration was unsuccessful without proximal flow arrest, but was successful in all other scenarios. For the 0.056-in catheter, remote aspiration was successful only with complete flow arrest. Conclusions: In a noncollapsible system, remote aspiration can be successfully achieved even in the setting of prominent branch arteries by using relatively large aspiration catheters. Proximal flow arrest may facilitate successful remote aspiration for some catheter sizes.

scholarly journals The Antibacterial Efficacy of Biopure MTAD in Root Canal Contaminated with Enterococcus faecalis

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Blerim Kamberi ◽  
Donika Bajrami ◽  
Miranda Stavileci ◽  
Shuhreta Omeragiq ◽  
Fatmir Dragidella ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Sodium Hypochlorite Solution ◽  
Antibacterial Efficacy ◽  
Human Teeth ◽  
Exact Test ◽  
Hypochlorite Solution ◽  
Root Canals ◽  
Significant Difference ◽  
Level Of Significance

Aim. The purpose of this in vitro study was to assess the antimicrobial efficacy of Biopure MTAD against E. faecalis in contaminated root canals. Materials and Methods. Forty-two single rooted extracted human teeth were inoculated with E. faecalis and incubated for four weeks. The samples were divided in two control and five experimental groups irrigated with 1.5% sodium hypochlorite solution (NaOCl); 3% NaOCl; BioPure MTAD; 1.5% NaOCl/17% EDTA; or 3% NaOCl/17% EDTA. After a one-week incubation, complete disinfection was confirmed by the absence of turbidity in the incubation media. Dentin shavings were taken from samples with no turbidity to verify whether E. faecalis was present in dentin tubules. Results were analyzed statistically using Fisher's exact test, with the level of significance set at . Results. Statistical analysis of the data obtained at Day 7 and after dentin shaving analysis showed that BioPure MTAD had significantly greater antibacterial activity than 1.5% NaOCl, 1.5% NaOCl/17% EDTA and 3% NaOCl/17% EDTA. No significant difference was detected between MTAD and 3% NaOCl. Conclusions. These findings suggest that BioPure MTAD possesses superior bactericidal activity compared with NaOCl and EDTA against E. faecalis.

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