Micro Hardness of Dental Tissues Influenced by Administration of Aspirin During Pregnancy

Nazir, Shakila; Ali, Amir; Zaidi, Shoaib

doi:10.4067/s0717-95022015000200028

Cited by 9 publications

(8 citation statements)

References 16 publications

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“…Support for this hypothesis can be drawn from data on enamel hardness (of unspecified location on the teeth) collected from a variety of sources in Berkovitz and Shellis [24; chapter 3], with lower values for rabbits ( Oryctolagus cuniculus ) than for some large mammals ( Cervus elaphus , Ovis aries , Bos taurus , Equus caballus ). Preliminary data from microhardness testing of rabbit enamel (measured on the chewing surface of both incisors and cheek teeth) point in the same direction [ 25 ] when compared, for example, to various enamel hardness measurements in ungulates [ 26 ]. However, there is a high variability between methods for enamel hardness measurements and consequent results, and whether samples for measurements were stored under wet or dry conditions prior to measuring has a relevant effect on the results as well [ 26 ]; hence, comparability of values from different studies may be compromised to a certain degree.…”

Section: Introductionmentioning

confidence: 99%

Species-specific enamel differences in hardness and abrasion resistance between the permanent incisors of cattle (Bos primigenius taurus) and the ever-growing incisors of nutria (Myocastor coypus)

et al. 2022

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Hypselodont (ever-growing) teeth of lagomorphs or rodents have higher wear rates (of a magnitude of mm/week), with compensating growth rates, compared to the non-ever-growing teeth of ungulates (with a magnitude of mm/year). Whether this is due to a fundamental difference in enamel hardness has not been investigated so far. We prepared enamel samples (n = 120 per species) from incisors of cattle (Bos primigenius taurus) and nutria (Myocastor coypus, hypselodont incisors) taken at slaughterhouses, and submitted them to indentation hardness testing. Subsequently, samples were split into 4 groups per species (n = 24 per species and group) that were assessed for abrasion susceptibility by a standardized brush test with a control (no added abrasives) and three treatment groups (using fine silt at 4 ±1 μm particle size, volcanic ash at 96 ±9 μm, or fine sand at 166 ±15 μm as abrasives), in which enamel abrasion was quantified as height loss by before-and-after profilometry. The difference in enamel hardness between the species was highly significant, with nutria enamel achieving 78% of the hardness of cattle enamel. In the control and the fine sand group, no enamel height loss was evident, which was attributed to the in vitro system in the latter group, where the sand particles were brushed out of the test slurry by the brushes’ bristles. For fine silt and volcanic ash, nutria enamel significantly lost 3.65 and 3.52 times more height than cattle. These results suggest a relationship between enamel hardness and susceptibility to abrasion. However, neither the pattern within the species nor across the species indicated a monotonous relationship between hardness and height loss; rather, the difference was due to qualitative step related to species. Hence, additional factors not measured in this study must be responsible for the differences in the enamel’s susceptibility to abrasion. While the in vitro brush system cannot be used to rank abrasive test substances in terms of their abrasiveness, it can differentiate abrasion susceptibility in dental tissue of different animal species. The results caution against considering enamel wear as a similar process across mammals.

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Section: Introductionmentioning

confidence: 99%

Species-specific enamel differences in hardness and abrasion resistance between the permanent incisors of cattle (Bos primigenius taurus) and the ever-growing incisors of nutria (Myocastor coypus)

et al. 2022

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“…This study's objective was to determine whether microhardness composite nanofibroin filler materials could be used as dental restorative material compared to the gold standard. The gold standard used is Z350 XT Flowable (3M ESPE) with a microhardness of 69.7-77.1 VHN which is equivalent to dentin microhardness (50-60 VHN) [13], [14]. Composite nanofibroin is expected to have good microhardness.…”

Section: Introductionmentioning

confidence: 99%

The Bombyx mori L., Nanofibroin Has Potential for Composite Filler Restoration

Puspita¹,

Ening²,

Nugroho³

2021

Advances in Health Sciences Research

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Bombyx mori L. nanofibroin has potential as an organic filler composite restoration because it has excellent mechanical and functional strength. One of the main requirements of the restoration material is to have good mechanical strength to wear resistance of dental restorations as well as tooth wear or antagonist restorations. The mechanical properties of microhardness are essential to study as a preliminary study in the new material. The aim of this study were to find out the nanofibroin potency as composite resin filler and to compare the microhardness of nanofibroin and nanofiller composites as gold standart. Methods: Nanofibroin particles were extracted from Bombyx mori L. cocoon by degumming, dissolving, dialysis and sonification. The nanofibroin filler weight was determined using volume fraction of natural fibers and mixed with an organic matrix. Three of sample groups were divided into nanofibroin composites, nanofiller composites (Z350 XT flowable 3M ESPE) as a positive control and composites without fillers as negative control. Microhardness was measured using a microhardness tester (Shimadzu, Japan). Data were analyzed using Kruskal Wallis test. Results: The nanofibroin composite have the highest microhardness (146.45), while nanofiller has a microhardness of (110.40 VHN) and the composite without filler has the lowest microhardness (31.55 VHN) and the statistical analysis showed p>0.05 level of significance. Conclusion. The Bombyx mori L. nanofibroin has potential for composite filler restoration eith better microhardness than positive control.

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“…Kriteria dari bahan alam yang dapat menggantikan filler inorganik yaitu harus memiliki kekerasan yang baik terhadap enamel dan dentin, yaitu berada pada kisaran 50 hingga 370 VHN. 7 Serat alam memiliki kelebihan yang dibutuhkan untuk menjadi filler komposit yaitu kekuatannya yang baik dan merupakan bahan yang terbarukan. 6 Bahan yang mungkin menjadi alternatif yaitu serat sutra yang dihasilkan oleh ulat sutra B. mori L., Resin dari serat sutra B. mori L., murni telah dibuktikan memiliki kekerasan yang cukup untuk menggantikan filler inorganik yaitu sebesar 66 VHN.…”

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Microhardness Differences Between Silk Fiber as a Natural Filler Composite Resin With Nanofiller Composite Resin

Puspita

Aziz

Nugroho³

2020

ODONTO : Dental Journal

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Background: Dental composite composed of natural filler is a trend nowadays. Silk fiber, Bombyx mori L., is one of the natural fibers that have good microhardness (66 VHN) and has a potency to become a renewable natural filler. This research aimed to determine microhardness differences of silk fiber composite B. mori L., and nanofiller composite resin as a gold standard. Method: A quasi-experimental laboratory using composite resin with silk fiber B. mori L., as a natural filler; nanofiller composite Z350 XT flowable (3M ESPE, USA) as a positive control and no-filler composite as a negative control. Four cylindrical specimens per group were made (d=3mm, h=6mm). Microhardness tests were done with Vickers hardness tester (Shimadzu, Japan). Indentation of 100 grams for 20 seconds. Result: There were significant differences in the natural filler, nanofiller group (positive) control and no-filler composite (negative control). Based on the Kruskal Wallis test result, there was a significant difference in microhardness (p=0.024). The highest microhardness was nanofiller (115,2 VHN), silk fiber filler (109,4 VHN), and no-filler composite (32,2 VHN). Conclusion: Silk fiber Bombyx mori L., has shown the good potential of being a renewable natural filler (109,4 VHN) however lower than nanofiller composites. PENDAHULUANResin komposit sebagai bahan restorasi gigi memiliki banyak kelebihan diantaranya adalah estetika yaitu warna yang serupa dengan gigi sehingga menguntungkan pada restorasi gigi anterior. Sifat lainnya yaitu memiliki kekerasan yang cukup untuk menahan beban pengunyahan sehingga cocok untuk bahan restorasi gigi posterior. 1 Resin komposit terdiri atas tiga bahan penyusun utama; yaitu monomer, filler, coupling agent. Ketiga bahan ini disempurnakan dengan penambahan bahan lainnya seperti akselerator-inisiator. 2,3,4,5 Komponen filler pada umumnya berasal dari bahan inorganik seperti glass (kaca) dan silika. Bahan filler ditambahkan bahan lain untuk mendapatkan warna radiopak. Bahan-bahan tersebut diantaranya barium, boron, zink dan senyawa logam lainnya. 2,5 Klasifikasi resin komposit pada umumnya dibagi berdasarkan ukuran filler yang digunakan, sehingga dapat dibagi sebagai resin komposit macrofill, midfiller, minifiller, microfill, dan nanofill.Resin komposit yang berukuran nanofill memiliki

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Micro Hardness of Dental Tissues Influenced by Administration of Aspirin During Pregnancy

Cited by 9 publications

References 16 publications

Species-specific enamel differences in hardness and abrasion resistance between the permanent incisors of cattle (Bos primigenius taurus) and the ever-growing incisors of nutria (Myocastor coypus)

Species-specific enamel differences in hardness and abrasion resistance between the permanent incisors of cattle (Bos primigenius taurus) and the ever-growing incisors of nutria (Myocastor coypus)

The Bombyx mori L., Nanofibroin Has Potential for Composite Filler Restoration

Microhardness Differences Between Silk Fiber as a Natural Filler Composite Resin With Nanofiller Composite Resin

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