The initial process of enamel prism arrangement and its relation to the Hunter-Schreger bands in dog teeth

Hanaizumi, Yoshinori; Yokota, Rumi; Domon, Takanori; Wakita, Minoru; Kozawa, Yukishige

doi:10.1679/aohc.73.23

Cited by 13 publications

(25 citation statements)

References 30 publications

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“…Furthermore, they noticed that there were no statistically significant differences between bracket debonding strength seven days after the bleaching 4 . The same findings were established in the studies conducted by Bishara and Bulut, which showed that if bonding procedure on the bleached teeth was delayed for 1 week the bond strength will increase 18–20 . However, Akin et al .…”

Section: Discussionsupporting

confidence: 82%

The effect of the teeth bleaching with 35% hydrogen peroxide on the tensile bond strength of metal brackets

Trakiniené

Daukontiene

Jurenas

et al. 2017

Sci Rep

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The objective of this study was to determine the effects of teeth bleaching on the tensile bond strength of metal brackets bonded with light-curing adhesive system to the human enamel. 40 recently extracted human permanent molars were used for the study. The mesial buccal surface of each tooth was used as a control group and the distal buccal surface was used as an experimental group. Control group surfaces were not submitted to bleaching, while experimental group surfaces were bleached with in-office bleaching material containing 35% hydrogen peroxide. 30 days after the bleaching, identical premolar metal brackets were bonded to each surface using light-curing adhesive. Both groups were submitted to a tension test, using a universal machine. The tensile bond strength of brackets bonded to the bleached enamel was 15% lower than that of brackets bonded to the unbleached enamel. After debonding, more adhesive was left on the bracket base in experimental group than in the control group. The conclusion of this study was that bleaching with an in-office bleaching material containing 35% hydrogen peroxide reduced the tensile bond strength of orthodontic bracket adhesive to the enamel surface.

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Section: Discussionsupporting

confidence: 82%

The effect of the teeth bleaching with 35% hydrogen peroxide on the tensile bond strength of metal brackets

Trakiniené

Daukontiene

Jurenas

et al. 2017

Sci Rep

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“…It has been associated most often with multiserial enamel where large groups of rods having the same rod angulations spiral, twist or zigzag around one another (Rensberger & von Koenigswald, ; Sahni, ; von Koenigswald & Pfretzschner, ; Hanaizumi et al. , ; Stefen & Rensberger, ; Jiang et al. ; Tabuce et al.…”

Section: Discussionmentioning

confidence: 99%

“…In the past half century, the shape and arrangement of enamel rods have also been of special interest as potential indicators of the pathways ameloblasts follow in secreting the enamel layer (Boyde, ; Osborn, ; Warshawsky, ; Risnes, ; Radlanski & Renz, ; Hanaizumi et al. ; Cox, ; Alloing‐Séguier et al. , ).…”

Section: Introductionmentioning

confidence: 99%

“…This creates arrangements in the deeper regions of the enamel layer called Hunter–Schreger bands, a term that has come to imply sites within an enamel layer of a mammal tooth where groups of enamel rods decussate, that is, change angles relative to each other (Kawai, ; Boyde, ; von Koenigswald, ; Sahni, ; von Koenigswald & Pfretzschner, ; Osborn, ; Hanaizumi et al. , ; Stefen & Rensberger, ; Tabuce et al. ; Lynch et al.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of the transverse 2D uniserial arrangement of rows of decussating enamel rods in the inner enamel layer of mouse mandibular incisors

Smith

et al. 2019

Journal of Anatomy

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The 2D arrangement of rows of enamel rods with alternating (decussating) tilt angles across the thickness of the inner layer in rat and mouse incisor enamel is well known and assumed to occur in a uniform and repetitive pattern. Some irregularities in the arrangement of rows have been reported, but no detailed investigation of row structure across the entire inner enamel layer currently exists. This investigation was undertaken to determine if the global row pattern in mouse mandibular incisor enamel is predominately regular in nature with only occasional anomalies or if rows of enamel rods have more spatial complexity than previously suspected. The data from this investigation indicate that rows of enamel rods are highly variable in length and have complex transverse arrangements across the width and thickness of the inner enamel layer. The majority of rows are short or medium in length, with 87% having < 100 rods per row. The remaining 13% are long rows (with 100–233 rods per row) that contain 46% of all enamel rods seen in transverse sections. Variable numbers of rows were associated with the lateral, central and mesial regions of the enamel layer. Each region contained different ratios of short, medium and long rows. A variety of relationships was found along the transverse length of rows in each region, including uniform associations of alternating rod tilts between neighboring rows, and instances where two rows having the same rod tilt were paired for variable distances then moved apart to accommodate rows of opposite tilt. Sometimes a row appeared to branch into two rows with the same tilt, or conversely where two rows merged into one row depending upon the mesial‐to‐lateral direction in which the row was viewed. Some rows showed both pairing and branching/merging along their length. These tended to be among the longest rows identified, and they often crossed the central region with extensions into the lateral and mesial regions. The most frequent row arrangement was a row of petite length nestled at the side of another row having the same rod tilt (30% of all rows). These were termed ‘focal stacks’ and may relate to the evolution of uniserial rat and mouse incisor enamel from a multilayered ancestor. The mesial and lateral endpoints of rows also showed complex arrangements with the dentinoenamel junction (DEJ), the inner enamel layer itself, and the boundary area to the outer enamel layer. It was concluded that the diversity in row lengths and various spatial arrangements both within and between rows across the transverse plane provides a method to interlock the enamel layer across each region and keep the enamel layer compact relative to the curving DEJ surface. The uniserial pattern for rows in mouse mandibular incisors is not uniform, but diverse and very complex.

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“…The analysis of HSBs has been hindered by technical difficulties. In most cases the analysis HSBs is performed by the use of scanning electron microscopy or polarizing light microscopy in fractured or sectioned teeth (Hanaizumi, Yokota, Domon, Wakita, & Kozawa, ; Leece et al, ; Lynch, O'Sullivan, Dockery, McGillycuddy, & Sloan, ). Invasive or destructive procedures can cause irreversible damage and may not be performed in specimens belonging to private collections, especially if specimens are valuable or unique (Koenigswald et al, ).…”

Section: Introductionmentioning

confidence: 99%

Digital enhancement of dental enamel microstructure images from intact teeth

Arrieta

Fogalli

Line

2018

Microscopy Res & Technique

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Dental enamel is formed by rod‐like structures, the enamel prisms. Groups of prisms are packed together in successive horizontal layers of alternating directions, known as Hunter‐Schreger bands (HSBs). HSBs are the major microstructural characteristic of mammalian enamel. The pattern of HSBs can vary among mammalian species and this variability may provide relevant information regarding the species life history and taxon identification. In human HSBs can be used as a biometric‐based parameter for personal identification in automated systems. The analysis of HSBs has been hampered by technical difficulties. The low contrast between light and dark bands and variations in light intensity may hinder the observation of HSBs in digital images. This article describes a simple and efficient computational procedure that greatly enhances the contrast and minimizes the differences in the intensity of illumination in HSBs images. Its use can significantly increase the quality and the number of HSBs that can be recorded in intact teeth.

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The initial process of enamel prism arrangement and its relation to the Hunter-Schreger bands in dog teeth

Cited by 13 publications

References 30 publications

The effect of the teeth bleaching with 35% hydrogen peroxide on the tensile bond strength of metal brackets

The effect of the teeth bleaching with 35% hydrogen peroxide on the tensile bond strength of metal brackets

Characteristics of the transverse 2D uniserial arrangement of rows of decussating enamel rods in the inner enamel layer of mouse mandibular incisors

Digital enhancement of dental enamel microstructure images from intact teeth

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