Shrinkage behaviors of dental composite restorations—The experimental–numerical hybrid analysis

Chuang, Shu Fen; Huang, Po-Kai; Chen, Terry Yuan Fang; Huang, Lo Hao; Su, Ko Chih; Chang, Chi Han

doi:10.1016/j.dental.2016.09.022

Cited by 26 publications

(15 citation statements)

References 43 publications

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“…In the 3D color map of experimental group, the labial and buccal surfaces of the 3D printed models in all experimental groups displayed a homogenous pattern of the blue area, which represented shrinkage. This might be explained by the characteristic of the surface in these areas, which was usually smooth and allowed the polymers to contact evenly . The opposite situation was present on the occlusal surface with its pit and groove regions where an uneven pattern of shrinkage was observed.…”

Section: Discussionmentioning

confidence: 99%

Accuracy of 3D Printed Models Created by Two Technologies of Printers with Different Designs of Model Base

Rungrojwittayakul

Kan

Shiozaki

et al. 2019

Journal of Prosthodontics

126

125

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Purpose To evaluate the accuracy of three‐dimensional (3D) printed models manufactured using two different printer technologies with different model base designs. Materials and Methods A maxillary typodont was scanned using a desktop scanner to generate the Standard Tessellation Language (STL) file as a reference scan. After the scanning procedure, the STL file was exported to Model Builder™ for designing the following two types of the model bases: a solid base design and a hollow base design with a 2.0 mm thickness of the external shell. Each design was printed to produce 10 models using a Continuous Liquid Interface Production (CLIP) printer and a Digital Light Processing (DLP) printer. The following four groups were tested: CLIP with solid base (CS); CLIP with hollow base (CH); DLP with solid base (DS); and DLP with hollow base (DH). A total of 40 models were scanned using the same desktop scanner to generate the STL files for evaluation of the accuracy by evaluation of trueness and precision. All STL files were superimposed with the control STL file via surface matching software and a comparison was performed using the 3D color mapping function and a 2D comparison of 48 points selected on the tested model. The data were collected by measuring the deviation between the tested model and the reference scan. Trueness was calculated by using the comparison among four tested groups. The Kruskal‐Wallis analysis was conducted to assess the overall statistical significance of differences among the tested groups (α = 0.05). For precision measurement, the evaluation was conducted using Intraclass Correlation Coefficient (ICC) value at 95% confident interval to determine the deviation within the same tested groups. Results The median values for the deviated distance of the four tested groups were 0.045 (CH), 0.035 (CS), 0.077 (DH), and 0.077 mm (DS). There were no statistically significant differences between the trueness of the two groups when using the same printers regardless of the designs of model base (p > 0.05). However, when comparing the two printers using the same model base design and the two different designs of model base, there were statistically significant differences in trueness (p < 0.05). The 3D printed models created using CLIP technology had higher trueness than the DLP technology printer. Precision of the 3D printed model was displayed in ICC value. The ICC values of four tested groups were 0.968 (CH), 0.981 (CS), 0.969 (DH), and 0.983 (DS). All tested groups were classified as exhibiting an excellent level of precision based on 95% confident interval of the ICC estimation. Conclusions The accuracy of 3D printed models was affected by the printer technology regardless of whether the model base was solid or hollow. The CLIP technology printer produced significantly less variation from the reference model than the DLP printer. However, all of the 3D printed models were determined to exhibit a clinically acceptable level of accuracy based on the recorded dimensions being less than 100 µm diffe...

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Section: Discussionmentioning

confidence: 99%

Accuracy of 3D Printed Models Created by Two Technologies of Printers with Different Designs of Model Base

Rungrojwittayakul

Kan

Shiozaki

et al. 2019

Journal of Prosthodontics

126

125

View full text Add to dashboard Cite

show abstract

“…AM models showed an obvious shrinkage pattern in anterior regions (Fig A). Since the maxillary anterior region is a morphologically smooth region, the polymers might have contracted more evenly; however, the occlusal surface of the posterior region showed more uneven shrinkage patterns, probably explained by the groove regions . Also this shrinkage pattern might be affected by the scan path of the intraoral scanner, for which we followed the manufacturer's recommendation.…”

Section: Discussionmentioning

confidence: 99%

Accuracy of Dental Replica Models Using Photopolymer Materials in Additive Manufacturing: In Vitro Three‐Dimensional Evaluation

Jin

Kim

et al. 2018

Journal of Prosthodontics

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Although the dental replica models using photopolymer materials did not show better trueness than the conventional stone models, there was no significant difference between the SLA and the stone models. Concerning precision, dental replica models using photopolymer materials presented better results than that of the conventional stone models. In sum, dental replica models using photopolymer materials showed sufficient accuracy for clinical use.

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“…The third hypothesis (the curing program has no impact on bond strengths) was confirmed, because the mean push-out bond strengths after polymerization with the “Turbo Program” and the “Soft-start Program” did not differ statistically from one another. Although it has been described in the literature that polymerization under high intensity causes a higher shrinkage stress [17], which is reflected in the loss of bond between resin composite and dentin [47], the higher conversion of degree during the polymerization may compensate for this [17].…”

Section: Discussionmentioning

confidence: 99%

“…Differing curing modes are available, depending on the polymerization light. Conventional polymerization lights are used for 15 to 20 s per increment [16,17]. Specialized “soft-start” programs start with a reduced intensity of 600 mW/cm 2 for five seconds, followed by 1200 mW/cm² for an additional 15 s. Special lights with high intensity (<2000 mW/cm 2 ) can be used in “turbo programs” for a reduced polymerization time of 5 s, which saves time, but increases the risk of pulp irritation caused by heat development [18,19,20].…”

Section: Introductionmentioning

confidence: 99%

Effect of Dentin Bonding Agents, Various Resin Composites and Curing Modes on Bond Strength to Human Dentin

et al. 2019

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This study investigated the influence of several dentin bonding agents, resin composites and curing modes on push-out bond strength to human dentin. 360 extracted caries-free third molars were prepared, cut into slices, embedded in epoxy resin and perforated centrally. One half of the specimens (180) were treated by using one-step adhesive systems and the other half (180) with multi-step adhesive systems. Subsequently, the cavities were filled with either universal, flowable or bulk-fill resin composite according to the manufactures’ product line and cured with either turbo or soft start program. After storage the push-out test was performed. The data was analyzed using Kolmogorov-Smirnov, three- and one-way ANOVA followed by the Scheffé post-hoc test, unpaired two-sample t-test (p < 0.05). The strongest influence on push-out bond strength was exerted by the resin composite type (partial eta squared ηP2 = 0.505, p < 0.001), followed by the adhesive system (ηP2 = 0.138, p < 0.001), while the choice of the curing intensity was not significant (p = 0.465). The effect of the binary or ternary combinations of the three parameters was significant for the combinations resin composite type coupled adhesive system (ηP2 = 0.054, p < 0.001), only. The flowable resin composites showed predominantly mixed, while the universal and bulk-fill resin composite showed adhesive failure types. Cohesive failure types were not observed in any group. Multi-step adhesive systems are preferable to one-step adhesive systems due to their higher bond strength to dentin. Flowable resin composites showed the highest bond strength and should become more important as restoration material especially in cavity lining. The use of a soft start modus for polymerization of resin composites does not enhance the bond strength to dentin.

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Shrinkage behaviors of dental composite restorations—The experimental–numerical hybrid analysis

Cited by 26 publications

References 43 publications

Accuracy of 3D Printed Models Created by Two Technologies of Printers with Different Designs of Model Base

Accuracy of 3D Printed Models Created by Two Technologies of Printers with Different Designs of Model Base

Accuracy of Dental Replica Models Using Photopolymer Materials in Additive Manufacturing: In Vitro Three‐Dimensional Evaluation

Effect of Dentin Bonding Agents, Various Resin Composites and Curing Modes on Bond Strength to Human Dentin

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