Biomechanical adaptations for burrowing in the incisor enamel microstructure of Geomyidae and Heteromyidae (Rodentia: Geomyoidea)

This study aimed to evaluate two hydrogen peroxide (HP)-based at-home bleaching systems in order to analyze whether nano-hydroxyapatite (nHA) addition may represent a reliable and safe solution for tooth whitening without altering dental microstructure and hardness. Human third molars (N = 15) were treated with two bleaching agents, one containing 6%HP (6HP) and the other 6% HP nHA-enriched (6HP-nHA) with average particle diameter ranging from 5–20 nm. Their effects on enamel were assessed using a spectrophotometer, Vickers microhardness (VMH) test and Scanning Electron Microscopy (SEM), comparing the treated groups with the non-treated control group (CTR). Color analysis revealed improvement in whiteness in both groups compared to CTR. VMH test results showed no differences among the groups. SEM analysis highlighted no evident changes in the enamel microstructure of tested groups compared to CTR. At high magnification, in 6HP group, a slight increase in irregularities of enamel surface morphology was observed, while 6HP-nHA group displayed removal of the aprismatic layer but preservation of the intact prismatic structure. These results suggest that the 6HP-nHA agent may be recommended to provide reliable whitening treatment, without damaging the enamel micromorphology and hardness.

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Incisor Enamel Microstructure and the Concept of Sciuravida

Bulletin of Carnegie Museum of Natural History ◽

10.2992/0145-9058(2007)39[127:iematc]2.0.co;2 ◽

2007 ◽

Vol 39 ◽

pp. 127-140 ◽

Cited By ~ 4

Author(s):

Thomas Martin

Keyword(s):

Enamel Microstructure

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Tooth development, histology, and enamel microstructure in Changchunsaurus parvus: Implications for dental evolution in ornithopod dinosaurs

PLoS ONE ◽

10.1371/journal.pone.0205206 ◽

2018 ◽

Vol 13 (11) ◽

pp. e0205206 ◽

Cited By ~ 5

Author(s):

Jun Chen ◽

Aaron R. H. LeBlanc ◽

Liyong Jin ◽

Timothy Huang ◽

Robert R. Reisz

Keyword(s):

Tooth Development ◽

Enamel Microstructure ◽

Dental Evolution

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Allosorex stenodus Fejfar, 1966 (Eulipotyphla, Soricidae): re-description of type material and re-interpretation of its fossil record

Fossil Imprint ◽

10.37520/fi.2020.006 ◽

2020 ◽

Vol 76 (1) ◽

pp. 84-98

Author(s):

Oldřich Fejfar ◽

Wighart v. Koenigswald ◽

Martin Sabol

Keyword(s):

Fossil Record ◽

Critical Evaluation ◽

Morphological Characters ◽

Microstructure Analysis ◽

Karst Area ◽

Eastern Asia ◽

Enamel Microstructure ◽

Fossil Remains ◽

Karst Areas ◽

Taxonomical Status

The original fossil record of Allosorex stenodus Fejfar, 1966 from Ivanovce (late Ruscinian, MN 15b) is redescribed and supplemented by the description of so far unpublished fossil remains, including upper dentition (P4 and M3) and a humerus fragment as well as the enamel microstructure analysis of m2. Based on the critical evaluation of other fossil remains from sites in Romania, Hungary, and France, the Ivanovce fossils are so far the only unquestionable recorded finds of A. stenodus in Europe, which can be considered as a local early Pliocene (MN 15) endemic species. Its occurrence is connected with the forested karst area along a broad valley of “pre-Váh” River, ecologically and climatically resembling the environment of modern karst areas in south-eastern Asia. Based on enamel microstructure analysis and unique mandible and dentition morphological characters, a separate taxonomical status of the species is also discussed.

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