Prepare notes on the internal structural similarity and functional difference of teeth
Answers
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.
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.
Premolars (Bicuspids) – 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. There are no premolars in the primary dentition.
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. The primary dentition only contains eight molars.
Explanation:
The answer is from dental anatomy.. hope it might help you
Answer:
Teeth are one of the strongest parts of the human body. It is mainly composed of proteins (collagen) and minerals (calcium). Apart from the digestion, teeth also play an important role in our speech. An adult will have 32 teeth, including the Wisdom teeth. Molars are the first permanent teeth to develop in, and most of the adults will have their complete set of permanent teeth in place by the age of 21.
Overall adults have 32 teeth in total, called permanent or secondary teeth, and it includes:
Eight incisors – Four incisors in the upper jaw and four incisors in the lower jaw.
Four canines – Two canines in the upper jaw and two canines in the lower jaw.
Eight premolars– Four premolars in the upper jaw and four premolars in the lower jaw.
Twelve molars- Six molars in the upper jaw and six in the lower jaw. It also includes four wisdom teeth.
Babies are born toothless as their primary source of food is mother’s milk. As the babies start to wean, milk teeth gradually start to appear. Milk teeth get replaced by permanent teeth by the time the individual turns six years old. Among the four types of teeth, the lower incisors are the first primary teeth to develop in, and most kids will have all their twenty primary teeth by age 3, which includes:
Eight incisors – Four incisors in the upper jaw and four incisors in the lower jaw.
Four canines – Two canines in the upper jaw and two canines in the lower jaw.
Eight molars – Four molars in the upper jaw and four molars in the lower jaw.
Also, during this phase, an individual will have a combination of milk and permanent teeth. Consequently, this stage is called mixed-stage.