Mindblown: a blog about philosophy.
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Bell Stage
At this point, the enamel organ grows into a bell shape, and two events take place. First, cells of the enamel organ differentiate, meaning they change functions. Depending on their new function, they will fall into one of four cell groups: Inner enamel epithelium Outer enamel epithelium Stratum intermedium Stellate reticulum Together, these cell groups…
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Cap stage
Cap Stage During this stage, cells begin to shape the outside layer of the tooth, forming a cap that sits on the rest of the tooth bud. This cap is called the enamel organ because it will later form the cells that produce enamel. The rest of the tooth bud, known as the dental papilla, will…
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Bud stage
The bud stage is characterized by the appearance of a tooth bud without a clear arrangement of cells. The stage technically begins once epithelial cells proliferate into the ectomesenchyme of the jaw. Typically, this occurs when the fetus is around 8 weeks old. The tooth bud itself is the group of cells at the periphery of the…
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Initiation Stage
One of the earliest signs in the formation of a tooth that can be seen microscopically is the distinction between the vestibular lamina and the dental lamina. It occurs in the sixth to seventh week of the embryonic life. The dental lamina connects the developing tooth bud to the epithelial layer of the mouth for a significant time. This is…
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Stages
Tooth development is commonly divided into the following stages: the initiation stage, the bud stage, the cap stage, the bell stage, and finally maturation. The staging of tooth development is an attempt to categorize changes that take place along a continuum; frequently it is difficult to decide what stage should be assigned to a particular…
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Human tooth development timeline
The following tables present the development timeline of human teeth.[20] Times for the initial calcification of primary teeth are for weeks in utero. Abbreviations: wk = weeks; mo = months; yr = years. Maxillary (upper) teeth Primary teeth Centralincisor Lateralincisor Canine Firstmolar Secondmolar Initial calcification 14 wk I.U. 16 wk I.U. 17 wk I.U. 15.5 wk I.U. 19 wk I.U. Crown completed 1.5 mo 2.5 mo 9 mo 6 mo 11 mo Root…
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Molars
Molars are the largest and strongest teeth. It has a large and flat biting surface, which is well-adapted for grinding food. Humans have 12 molars, six in each jaw. Four of those are wisdom teeth, which is also called the third molar, which come in between the ages of 17 to 25. There are four types…
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Premolars
Premolars are also called bicuspids and are located behind the canines. These teeth have a flat surface with ridges, which is adapted for crushing and grinding food into smaller portions. Humans have eight premolars, two on each side of the jaws.
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Canines
Canines are also called cuspids. They are situated at the ‘corners’ of the dental arches. They are characteristically sharp, elongated and pointy surface. Their primary function is to grip and tear food (tough food such as meat). Humans have four canines, two in the upper jaw and two in the lower jaw.
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Incisors
Incisors are present at the front of the mouth. These teeth have sharp edges and are adapted for cutting food into small, chewable pieces. Humans have eight incisors, four incisors in the upper jaw and four in the lower jaw.
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