Failure Analysis of a Humeral Shaft Locking Compression Plate—Surface Investigation and Simulation by Finite Element Method

Antoniac, Iulian Vasile; Stoia, Dan Ioan; Ghiban, Brânduşa; Tecu, Camelia; Miculescu, Florin; Vigaru, Cosmina; Săceleanu, Vicențiu

doi:10.3390/ma12071128

Cited by 37 publications

(30 citation statements)

References 47 publications

(42 reference statements)

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“…The methods elected to be used in this study were microscopic examination, scanning electron microscopic examination and dye penetration. The examination at the optic microscope, as well as, dye penetration is the most notorious methods because they are easy to handle [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40].…”

Section: Resultsmentioning

confidence: 99%

Two Adhesive Systems-effect on Adhesion to Tooth Structure

Deac¹,

Earar²,

Burtea³

et al. 2019

Rev. Chim.

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This study evaluates and compares by dye penetration method and SEM photomicrographs the sealing obtained using two different classes of adhesive systems (etch-and-rinse and self-etch with selective etching) with SDR (Dentsply) bulk fill composite. 84 class V cavities were prepared on oral and vestibular face of 42 intact, freshly extracted wisdom teeth. The cavities were randomly divided in two groups and restored: Group 1 with prime &bond one select (Dentsply) and SDR (Dentsply) and Group 2 with prime&bond one Etch&Rinse (Dentsply) and SDR (Dentsply). Prime&bond one Select (Dentsply) is a single component adhesive and can be used in self etch mode, in selective enamel etch mode, or in etch-and-rinse mode. We chosen for this study the selective etch of the enamel mode. Prime&bond one Etch Rinse (Dentsply) is a universal etch-and-rinse one-bottle dental adhesive, designed to be used in two steps. The bulk fill composites are commonly used in modern dentistry due to their properties of low polymerization shrinkage and curing in layer of 4 mm depth, offering the practitioner a fast clinical procedure with good results. The results showed a good sealing at enamel and dentin margins with no statistically significant difference between adhesives, even though the mean of enamel infiltration was smaller for Group1. Furthermore the results show that there were differences between the two groups, for the infiltrations at the enamel, the values of microleakage being arithmetically higher for Group 1, but with no statistically difference between the two groups.SEM images showed for both groups a good adhesion surface with the tooth, but the hybrid layer of the total-etch adhesives is different from the hybrid layer formed by self etch adhesives, in terms of thickness, uniformity. In conclusion both adhesive systems have equivalent sealing qualities and can be successfully used with SDR.

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Section: Resultsmentioning

confidence: 99%

Two Adhesive Systems-effect on Adhesion to Tooth Structure

Deac¹,

Earar²,

Burtea³

et al. 2019

Rev. Chim.

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“…This study design was a short-term study, although the orthodontic treatment period is a long-term treatment, for at least two years. Further research must be done in order to establish the adequate composition for oral hygiene products, capable to limit the unfavourable effect of demineralization on enamel structure and colour [40,41,42].…”

Section: Discussionmentioning

confidence: 99%

Toothpaste Composition Effect on Enamel Chromatic and Morphological Characteristics: In Vitro Analysis

et al. 2019

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The aim of this in vitro study was to assess the effect of toothpastes, with different compositions, on optical and morphological features of sound and demineralized enamel. We selected twenty-five teeth, recently extracted for orthodontic purposes, for this in vitro study. The teeth were caries free, without stains, fissures, filling or hypoplasia observed at inspection under standard conditions. Teeth were brushed (for 2–3 min, twice a day, for 21 days), with five different toothpastes (four commercially available and an experimental one) containing fluoride and hydroxyapatite. After that, teeth were demineralized with 37% orthophosforic acid (Ultra Etch®, Ultradent Products Inc., South Jordan, UT, USA) for 60 s. We repeated the brushing protocol for another 21 days on demineralized enamel. Enamel vestibular surfaces were examined using a spectrophotometer (Vita EasyShade -Vita Zahnfabrik, Bad Sackingen, Germany) and a Scanning Electron Microscope (Inspect S®, FEI Company, Hillsboro, OR, USA). Differences were statistically significant for colour parameters L* and ΔE*. SEM evaluation reveals demineralized enamel mineral gain after brushing with selected toothpastes. Toothpastes with specific ingredients can represent a balance between aesthetic and mineralization, and an oral hygiene correct algorithm is able to preserve enamel characteristics during ortodontic treatement with fixed appliances.

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“…Using the relations from equation (1) in equation (2) the equivalent spring constant can be determined using equation (3) and simplifying the force yields equation (4). The total elongation of the assembly is dictated by individual characteristics of the components and the spring with lowest mechanical characteristics is to deform strongest [14][15][16]. The local deformations of the tensile test samples were studied by tracing a grid before testing and measuring the local deformations for each part.…”

Section: Induction Heating Patternmentioning

confidence: 99%

Effect of Local Heating on the Mechanical Characteristics of Repaired Automotive Panels

Navodariu¹,

Brânzei²,

Ciocoiu³

et al. 2019

Mat.Plast.

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Flame straightening is a technology process used to eliminate deformations. This method relies on local heating of the material to correct geometry or damaged parts. In the local automobile services its main use is for repairs of less critical deformed components. The maximum temperature and thermal gradient, heating time, cooling rate and number of heating cycles affect the mechanical properties since local heating can alter material microstructure. The aim of this research was to determine the mechanical characteristics of thin steel plates repaired by local heating associated with plastic deformation (similar to hot working) and cold straightening (similar to local cold working) for automotive side and door panels made of structural steel. Thin sheet plates, 0.9mm thickness, were deformed by impact and repaired by local heating using the flame and induction heating then plastically deformed while hot as well as straightened without heating. The heat repaired samples were studied by light microscopy to determine microstructure change and samples were tensile tested to determine their mechanical characteristics. Local excessive grain growth generates anisotropy, the assembly behaves as a composite material with regions that show significant plastic deformations while others little or no deformations at al. Without procedures adjusted to each material repairs involving heating are to be avoided, cold working should be employed when replacement is not possible.

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Failure Analysis of a Humeral Shaft Locking Compression Plate—Surface Investigation and Simulation by Finite Element Method

Cited by 37 publications

References 47 publications

Two Adhesive Systems-effect on Adhesion to Tooth Structure

Two Adhesive Systems-effect on Adhesion to Tooth Structure

Toothpaste Composition Effect on Enamel Chromatic and Morphological Characteristics: In Vitro Analysis

Effect of Local Heating on the Mechanical Characteristics of Repaired Automotive Panels

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