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Citing articles via Google Scholar. Scandcleft randomized trials of primary surgery for unilateral cleft lip and palate: occlusion in 8-year-olds according to the Modified Huddart and Bodenham index.

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Scandcleft randomized trials of primary surgery for unilateral cleft lip and palate: maxillary growth at eight years of age. Scandcleft randomized trials of primary surgery for unilateral cleft lip and palate: dental anomalies in 8-year olds. Looking for your next opportunity? The stimulus for sutural bone growth is thought to be related to the tension produced by the displacement of bone.

Growth carries the maxilla forwards and downwards as it increases in size.

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Reproduced by kind permission of R. Development of the vestibular band and dental lamina At 7 weeks of intrauterine life. The primary epithelial band develops two processes the vestibular band and the dental lamina. The vestibular band forms buccally and will eventually form the vestibule, separating the lips and checks from the teeth and gingivae.

The dental lamina forms lingually and develops into an arch shape band on which the tooth germs will develop Figure 1. Development of the tooth germ The tooth germ develops in three stages: bud, cap and bell Figure 1.

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At 8 weeks of intrauterine life, clumps of mesenchymal cells induce the dental lamina to form swellings known as enamel organs. Each enamel organ will be responsible for the development of each tooth Figure 1. As the enamel organs grow and increase in size, the inner aspect becomes concave resembling skull caps.

By the late cap stage, at 12 weeks of intrauterine life, cells on the inner aspect of the enamel organ change from cuboidal to columnar forming the inner enamel epithelium. The outer layer of cells remains cuboidal and is known as the outer enamel epithelium. Beneath the inner enamel epithelium the condensation of mesenchymal cells is termed the dental papilla ; this will eventually become the pulp. A fibrous capsule surrounds each enamel organ and this is termed the dental follicle ; this will eventually become the periodontal ligament. Bell By 14 weeks of intrauterine life Figure 1. At the late bell stage the dental lamina disintegrates and is ready for the formation of dental hard tissue.

Dentine formation always precedes enamel formation.

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Enamel maturation During maturation from pre-enamel to mature enamel, the enamel crystallites increase in size and the organic content is reduced. The reduced enamel epithelium protects the enamel during eruption and will eventually become the junctional epithelium.

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Formation of the root Occurs when the crown has completed. These cells differentiate into cementoblasts cementum-forming cells. Cementoblasts are cuboidal in shape and form a single layer on the surface of the root dentine. The cementoblasts secrete cementum matrix and crystallites of hydroxyapatite are deposited in this matrix and mineralisation occurs. During formation, a thin layer of unmineralised cementum is always present on the surface; this is known as cementoid. Formation of the periodontal ligament Cells within the dental follicle give rise to fibroblasts that secrete collagen.

Once cementum formation has begun, collagen fibres within the dental follicle orientate themselves into bundles, which are perpendicular to the root surface.

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These fibres will form the principal fibres of the periodontal ligament. Tooth eruption Tooth eruption is the bodily movement of a tooth from its development position into its functional position in the oral cavity. It can be broken down into two phases; the per-functional eruptive phase and the functional eruptive phase Figure 1. The eruptive force of tooth eruption is unclear; however, several theories have been put forward although there is little evidence to support them.

These are:. The approximate initial calcification and eruption dates are listed in Tables 1. Table 1. The surface of the oral mucosa consists of epithelial tissue.

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Epithelial tissue is first classified according to the shape of the cells as being squamous flat cells , cuboidal cube shaped or columnar tall, narrow cells and second by the number of cell layers. Convert currency. Add to Basket. Book Description Thieme Medical Pub, Condition: Good. Item may show signs of shelf wear. Pages may include limited notes and highlighting. May include supplemental or companion materials if applicable. Access codes may or may not work.

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