Презентация "Types and structure of teeth".
презентация к уроку

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Types and structure of teeth Автор: преподаватель английского языка Анисимова Д.А.

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Incisors – The four front teeth in both the upper and lower jaws are called incisors. Their primary function is to cut food. The two incisors on either side of the midline are known as central incisors. The two adjacent teeth to the central incisors are known as the lateral incisors. Incisors have a single root and a sharp incisal edge .

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Canines – There are four canines in the oral cavity. Two in the maxillary arch and two in the mandibular area. They are behind and adjacent to the lateral incisors. Their main function is to tear food. They have a single, pointed cusp and a single root. They have the longest root of any tooth. They also serve to form the corners of the mouth.

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Premolars – These teeth are located behind and adjacent to the canines and are designed to crush food. There are eight premolars in the oral cavity. There are two in each quadrant of the mouth. The one closest to the midline is the first premolar and the one farthest from the midline is the second premolar. These teeth can have 3-4 cusps. The maxillary first premolar has two roots, and the remaining premolars have a single root.

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Molars – The most posterior teeth in the mouth are the molars. They have broader and flatter surfaces with 4-5 cusps. They are designed to grind food. Mandibular molars typically have 2 roots. Maxillary molars, which are located behind the second premolars, typically have 3 roots. There are 12 molars in the permanent dentition with three in each quadrant of the mouth. They are named starting with closest to the midline as first molars, second molars and third molars. Although, some people do not fully develop the third molars. Third molars are often referred to as wisdom teeth.

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Structure of the Tooth

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Enamel is the outer covering of the crown and is the hardest substance in the body . Cementum is the outer covering of the root and is structure to bone . Cementum meets enamel at the neck of the tooth . Dentine occupies the interior of the crown and root , and is very sensitive to pain . Pulp . Unlike enamel , dentine and cementum , the pulp is purely soft tissue . In contains blood vessels and nerves , and occupies the centre of the dentine . A tooth is attached to its socket in the jaw by a soft fibrous tissue called the periodontal membrane .

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A. Fill in the correct names of the types of teeth.

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Canines incisors moral premolars wisdom teeth The ________are the last teeth to grow in. 2. There are four sharp tipped _______ in the human mouth. The ________ are located between the canines and the molars. The ________ include the two large front teeth. The patient lost a _______, witch made it harder to grid food. B. Fill in the gaps with the words .