A comparative study on component volumes from outer to inner dental enamel in relation to enamel tufts

Macena, Marcus Setally Azevedo; Leite, Maria Luísa; Gouveia, Cíntia de Lima; Lima, Tamires Alcoforado Sena de; Athayde, Priscilla Alves Aguiar; Sousa, Frederico Barbosa de

doi:10.1016/j.archoralbio.2014.03.001

Cited by 29 publications

(21 citation statements)

References 32 publications

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“…These results are consistent with another study [Reed et al, 2015] that demonstrated a significant reduction in mineral and protein contents, especially on the inner enamel surface, near the dentin-enamel junction, after radiotherapy. In this regard, it is probable that both (middle and inner) enamel depths could be more susceptible to ionizing radiation effects due to the existence of higher volumes of organic contents in these areas [Setally et al, 2014]. In addition, in the present study, the interprismatic spaces of cervical enamel became more evident probably because of its reduced thickness when compared to other anatomic enamel areas, such as cusps and occlusal pits.…”

Section: Discussionmentioning

confidence: 50%

“…In general, variations in intrinsic birefringence may be related to differences in the morphology, orientation, volume, or mineralization of hydroxyapatite crystals [Carlström, 1964;Sousa et al, 2006] in different enamel depths and areas. It has already been described that the inorganic components of enamel are more evident on outer enamel surfaces [De Menezes Oliveira et al, 2010;Setally et al, 2014]. On the other hand, the differences in form birefringence observed may also be related to the distribution of organic components that are usually found in higher volumes in the inner enamel, near the dentin- enamel junction [De Menezes Oliveira et al, 2010;Setally et al, 2014].…”

Section: Discussionmentioning

confidence: 89%

“…It has already been described that the inorganic components of enamel are more evident on outer enamel surfaces [De Menezes Oliveira et al, 2010;Setally et al, 2014]. On the other hand, the differences in form birefringence observed may also be related to the distribution of organic components that are usually found in higher volumes in the inner enamel, near the dentin- enamel junction [De Menezes Oliveira et al, 2010;Setally et al, 2014]. Based on the intrinsic and form birefringence information obtained by polarized light microscopy in the present study, cervical enamel was the most frequently affected dental area by radiotherapy.…”

Section: Discussionmentioning

confidence: 99%

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Structural Analysis of Enamel in Teeth from Head-and-Neck Cancer Patients Who Underwent Radiotherapy

Madrid

Paglioni²,

Line³

et al. 2017

Caries Res

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Objective: To analyze macroscopic, microscopic, and ultrastructural aspects of enamel from head-and-neck cancer patients submitted to radiotherapy. Materials and Methods: Twenty sound extracted permanent molars were used and divided into 2 groups. The experimental group consisted of 10 molars from head-and-neck cancer patients submitted to radiotherapy with total doses that ranged from 50 to 70 Gy. Ten molars from patients who did not receive radiotherapy were matched with experimental-group samples by anatomic tooth group and comprised the control group. To perform a macroscopic analysis, standardized photos of different enamel faces were taken with a camera. Teeth were subjected to longitudinal cuts and hand polished to a final thickness of 0.1 mm. Enamel was analyzed under polarized light microscopy, and optical retardation values of birefringence were calculated in cervical, cusp, and occlusal pit areas. Subsequently, the same enamel areas were analyzed by scanning electron microscopy. Data from optical retardation values were statistically analyzed by 2-way ANOVA and Fisher's test (α < 0.05). Results: No macroscopic differences were observed between the irradiated and control groups. Polarized light microscopy analysis revealed that cervical enamel exhibited darker areas characterized by discrete birefringence patterns compared to the control enamel. Optical retardation values were only significantly different in the cervical enamel of the irradiated and control groups (p < 0.0001). Scanning electron microscopy analysis revealed more evident interprismatic spaces in the cervical and outer cusp enamel of irradiated samples. Conclusions: Head-and-neck radiotherapy reduced optical retardation values of birefringence in cervical enamel, and the interprismatic spaces became more evident.

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Section: Discussionmentioning

confidence: 50%

Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Structural Analysis of Enamel in Teeth from Head-and-Neck Cancer Patients Who Underwent Radiotherapy

Madrid

Paglioni²,

Line³

et al. 2017

Caries Res

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“…In behaving like this, ameloblasts act at a distance of up to 2 mm and their effectiveness must thus be a function of a diffusion gradient. This appears to set up a parallel gradient in the mature tissue in chemical composition [35,36,37,38,39] that is also mirrored in some mechanical properties, as described below.…”

Section: Enamel Structurementioning

confidence: 99%

The Wear and Tear of Teeth

Lucas¹,

Casteren²

2014

Med Princ Pract

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A review is presented of the mechanical damage suffered by tooth crowns. This has been the subject of much recent research, resulting in a need to revise some of the thinking about the mechanisms involved. Damage is classified here by scale into macro-, meso- and microfracture. The focus is on the outer enamel coat because this is the contact tissue and where most fractures start. Enamel properties appear to be tailored to maximize hardness, but also to prevent fracture. The latter is achieved by the deployment of developmental flaws called enamel tufts. Macrofractures usually appear to initiate as extensions of tufts on the undersurface of the enamel adjacent to the enamel-dentine junction and extend from there into the enamel. Cracks that pass from the tooth surface tend to be deflected by an enamel region of high toughness; if they find the surface again, a chip (mesofracture) is produced. The real protection of the enamel-dentine junction here is the layer of decussating inner enamel. Finally, a novel analysis of mechanical wear (microfracture) suggests that the local toughness of the enamel is very important to its ability to resist tissue loss. Enamel and dentine have contrasting behaviours. Seen on a large scale, dentine is isotropic (behaving similarly in all directions) while enamel is anisotropic, but vice versa on a very small scale. These patterns have implications for anyone studying the fracture behaviour of teeth.

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“…and loosely bound water) [17][18][19][20][21][22][23][24], which accumulates at sites where mineral density is low such as intercrystallite and interprismatic spaces [16]. Details regarding the microstructural features are described later in this review.…”

Section: Introductionmentioning

confidence: 99%

Influence of structural hierarchy on the fracture behaviour of tooth enamel

Yılmaz

Schneider

Swain

2015

Phil. Trans. R. Soc. A.

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Tooth enamel has the critical role of enabling the mastication of food and also of protecting the underlying vital dentin and pulp structure. Unlike most vital tissue, enamel has no ability to repair or remodel and as such has had to develop robust damage tolerance to withstand contact fatigue events throughout the lifetime of a species. To achieve such behaviour, enamel has evolved a complex hierarchical structure that varies slightly between different species. The major component of enamel is apatite in the form of crystallite fibres with a nanometresized diameter that extend from the dentin-enamel junction to the oral surface. These crystallites are bound together by proteins and peptides into a range of hierarchical structures from micrometre diameter prisms to 50-100 µm diameter bundles of prisms known as Hunter-Schreger bands. As a consequence of such complex structural organization, the damage tolerance of enamel increases through various toughening mechanisms in the hierarchy but at the expense of fracture strength. This review critically evaluates the role of hierarchy on the development of the R-curve and the stress-strain behaviour. It attempts to identify and quantify the multiple mechanisms responsible for this behaviour as well as their impact on damage tolerance.

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A comparative study on component volumes from outer to inner dental enamel in relation to enamel tufts

Cited by 29 publications

References 32 publications

Structural Analysis of Enamel in Teeth from Head-and-Neck Cancer Patients Who Underwent Radiotherapy

Structural Analysis of Enamel in Teeth from Head-and-Neck Cancer Patients Who Underwent Radiotherapy

The Wear and Tear of Teeth

Influence of structural hierarchy on the fracture behaviour of tooth enamel

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