Evaluation of the effects of finish line type and width on the fracture strength of provisional crowns

Karaman, Tahir; Eşer, Bekir; Altintas, Eyyüp; Atala, Mustafa Hayati

doi:10.1007/s10266-020-00533-9

Cited by 11 publications

(10 citation statements)

References 25 publications

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“…The results of the present study agree with another study (18) , in which the mean fracture resistance of CAD/CAM PMMA provisional restorations was significantly higher than bis-acrylic and self-cured composite restorations. Thus, CAD/CAM PMMA was indicated for the construction of interim restorations owing to its good fracture resistance on clinical performance.…”

Section: Discussionsupporting

confidence: 92%

Fracture Resistance of Provisional Crowns Fabricated by Conventional, CAD/CAM, and 3D Printing Techniques

Sakr¹,

Mandour

Gabal

2022

ADJ-for Girls

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Purpose:The aim of this study was to compare fracture resistance of provisional restorations fabricated with conventional manual procedure, CAD/CAM milling and 3D Printing techniques. Materials and Methods: one human upper first premolar was prepared and duplicated using epoxy resin to produce twenty one dies. Accordingly, a total of (N=21) provisional crowns were constructed. The Constructed provisional restorations were divided into 3 groups according to the method of construction (n=7 for each group), Group 1: Provisional crowns were constructed using conventional manual technique, Group2: Provisional crowns were constructed using CAD/CAM milling technique, Group3: Provisional crowns were constructed using 3D Printing technique.All Provisional crowns were bonded to their corresponding epoxy resin dies by using CharmTemp ZONE temporary cement and subjected to thermocycling procedure simulating approximately one month of clinical situations Results: Statistical analysis showed that the fracture resistance of CAD/CAM samples (group 2), recorded the statistically significant highest mean fracture resistance value (910.20 ± 118.95), followed by 3D Printing samples (group 3) (720.80 ± 129.57), while the lowest value was recorded for Conventional samples (group 1) (626.71 ± 103.23). ANOVA test showed that there was no significant difference between 3D Printing samples (group 3) and Conventional samples (group 1). Conclusion: CAD/CAM provisional crowns have superior strength than 3D Printing and conventional crowns.

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Section: Discussionsupporting

confidence: 92%

Fracture Resistance of Provisional Crowns Fabricated by Conventional, CAD/CAM, and 3D Printing Techniques

Sakr¹,

Mandour

Gabal

2022

ADJ-for Girls

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“…A previous study [18] reported that there is no significant difference for the fracture resistance between provisional crowns using the chamfer preparation with a width ranging from 0.6 mm to 1 mm. The present study complements this information suggesting that the failure will start in the occlusal surface and the anatomy should be more relevant for the maximum fracture load on acrylic resin CAD/CAM crowns.…”

Section: Discussionmentioning

confidence: 91%

Influence of occlusal anatomy on acrylic resin CAD/CAM crowns fracture load and stress distribution.

Borges

Lima

Campaner

et al. 2021

d3000

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Objectives: This study compared the influence of occlusal anatomy on acrylic CAD/CAM crowns fracture load and stress distribution. The null hypothesis was that there would be no difference between the provisional crowns fracture load and stress according to different occlusal anatomy.Methods: A full-crown preparation was simulated using dentin analogue (G10, Protec, São Paulo, Brazil) totaling 20 identical preparations. Next, twenty acrylic crowns were milled using different occlusal design parameter (Young or Adult) available in the software database. The crowns were cemented (Temp-bond, NE Kerr Dental, Brea, CA, USA) and fractured using a compressive load (0.5 mm/min of cross-head speed). Data were analyzed by using one-way ANOVA and Tukey tests (p< 0.05). A similar geometry was modeled and exported to the analysis software to perform a static structural analysis. The maximum principal stress was calculated using the finite element method with 300 N chewing load simulation.Results: The occlusal anatomy significantly influenced the load-to-fracture (p<0.05). Young design showed lower fracture load (1139±132 N) than Adult design (2007±345 N). The tensile stress distribution showed a similar pattern for both groups however the highest stress peak was calculated for Young design (76 MPa) in the occlusal surface.Conclusion: The anatomy design with higher cusp angulation and occlusal sulcus more evident can increase the stress concentration and reduce the fracture load for acrylic resin CAD/CAM crowns.

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“…There are similar studies representing higher fractural strength of CAD-CAM provisionals. 4 18 19 20 21 22 23 In a previous study, Karaman et al 24 reported that the fracture strength was higher in the CAD-CAM PMMA provisional crowns obtained from the bis-acrylic resin and the self-curing composite materials. This result is also similar to the present study as no significant difference was found between Printed and Milling groups ( P > .05).…”

Section: Discussionmentioning

confidence: 99%

Comparison of fracture strength, surface hardness, and color stain of conventionally fabricated, 3D printed, and CAD-CAM milled interim prosthodontic materials after thermocycling

Yıldırım,

Aykent,

Özdoğan

2024

J Adv Prosthodont

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PURPOSE The purpose of this in vitro study was to investigate the fracture resistance, surface hardness, and color stain of 3D printed, CAD-CAM milled, and conventional interim materials. MATERIALS AND METHODS A total of 80 specimens were fabricated from auto polymerizing polymethyl methacrylate (PMMA), bis-acryl composite resin, CAD-CAM polymethyl methacrylate resin (milled), and 3D printed composite resin (printed) (n = 20). Forty of them were crown-shaped, on which fracture strength test was performed (n = 10). The others were disc-shaped specimens (10 mm × 2 mm) and divided into two groups for surface hardness and color stainability tests before and after thermal cycling in coffee solution (n = 10). Color parameters were measured with a spectrophotometer before and after each storage period, and color differences (CIEDE2000 [DE 00 ]) were calculated. The distribution of variables was measured with the Kolmogorov Smirnov test, and one-way analysis of variance (ANOVA), Tukey HSD, Kruskal-Wallis, Mann-Whitney U tests were used in the analysis of quantitative independent data. Paired sample t-test was used in the analysis of dependent quantitative data ( P < .05). RESULTS The highest crown fracture resistance values were determined for the 3D printed composite resin ( P < .05), and the lowest were observed in the bis-acryl composite resin ( P < .05). Before and after thermal cycling, increase in mean hardness values were observed only in 3D printed composite resin ( P < .05) and the highest ΔE 00 value were observed in PMMA resin for all materials ( P < .05). CONCLUSION 3D printing and CAD-CAM milled interim materials showed better fracture strength. After the coffee thermal cycle, the highest surface hardness value was again found in 3D printing and CAD-CAM milled interim samples and the color change of the bis-acryl resin-based samples and the additive production technique was higher than the PMMA resin and CAD-CAM milled resin samples.

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Evaluation of the effects of finish line type and width on the fracture strength of provisional crowns

Cited by 11 publications

References 25 publications

Fracture Resistance of Provisional Crowns Fabricated by Conventional, CAD/CAM, and 3D Printing Techniques

Fracture Resistance of Provisional Crowns Fabricated by Conventional, CAD/CAM, and 3D Printing Techniques

Influence of occlusal anatomy on acrylic resin CAD/CAM crowns fracture load and stress distribution.

Comparison of fracture strength, surface hardness, and color stain of conventionally fabricated, 3D printed, and CAD-CAM milled interim prosthodontic materials after thermocycling

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