![]() ![]() The FDI Dental Numbering System for Adult Teethįor adults, the mouth is divided into quadrants numbered from 1 to 4 clockwise starting from the upper-left from the dentist's view. Different numbering systems are used for adult teeth and children's deciduous teeth. Information with other oral health professionals. This numbering system is used to record information on the health of a patient's teeth and to efficiently share 4.Teeth in the Care For Smiles Smile Gallery are numbered according to the internationally recognised two-digit FDI (Federation Dentaire Internationale) numbering system used by dentists. The mandibular molar is the first permanent tooth to erupt in the mouth. The primary dentition only contains eight molars. Third molars are often referred to as wisdom teeth and often have fused roots. Although, some people do not fully develop the third molars and thus can vary in size and shape or even be absent. They are named starting with closest to the midline as first molars, second molars and third molars. There are 12 molars in the permanent dentition with three in each quadrant of the mouth. Maxillary molars, which are located behind the second premolars, typically have 3 roots. Mandibular molars typically have 2 roots. They have broader and flatter surfaces with 4-5 cusps and have the largest crown of any other teeth. ![]() – The most posterior teeth in the mouth are the molars. Often the 1st premolar is the tooth that is extracted in orthodontic procedures to make room for crowded teeth to move into place. The premolars replace the primary molars when they exfoliate. There are no premolars in the primary dentition. The maxillary first premolar has two roots, and the remaining premolars have a single root. In the mandibular 1st premolar, the lingual cusp is very small and usually not functional. The facial cusp is typically longer and wider than the lingual cusp. These teeth can have 2-3 cusps (mandibular second premolar typically has 3). The one closest to the midline is the first premolar and the one farthest from the midline is the second premolar. There are two in each quadrant of the mouth. There are eight premolars in the oral cavity. – These teeth are located behind and adjacent to the canines and are designed to crush and grind food. The lingual is formed by a single lingual ridge that lies between two lingual fossae. The canines have very prominent cingulum, but the maxillary cingulum is more prominent than the one on the mandibular canines and it rarely has pits. They also serve to form the corners of the mouth. They have a single, pointed cusp and a single root. They are behind and adjacent to the lateral incisors. Two in the maxillary arch and two in the mandibular area. – There are four canines in the oral cavity. The mandibular central incisor is the smallest tooth of all the incisors. Sometimes maxillary lateral incisors can have a peg-like shape and are thus referred to as “peg laterals.” The maxillary lateral incisors may also be congenitally missing. Maxillary lateral incisors often vary the most in their shape. The maxillary central incisors are also unique in that they are larger than mandibular central incisors. Central incisors have sharper and more acute incisor angles that lateral incisors. These incisal edge mamelons are usually worn away shortly after eruption with normal biting function. The cingulum is remainder of the 4th mamelon and can have a pit formed in it where it meets the lingual surface of the tooth. ![]() When first erupted, the incisors have 3 mamelons, or bumps on the incisal edge which are remainders of the lobes from which the tooth developed. The incisors are developed from 4 lobes, in contrast to posterior teeth which develop from 4 to 5 lobes. Incisors have a single root and a sharp incisal edge. The two adjacent teeth to the central incisors are known as the lateral incisors. The two incisors on either side of the midline are known as central incisors. – The four front teeth in both the upper and lower jaws are called incisors. There are 4 types of teeth in the oral cavity: ![]()
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