DENTITION CHAPTER 1.DENTITION DENTITION CONCEPTS DENTITION:the teeth in the dental arch. PRIMARY DENTITION:the teeth that erupt first and are normally shed and replaced by permanent (succedaneous)teeth.Also called:DECIDUOUS ENTITION PERMANENT DENTITION:the teeth that erupt after the primary dentition that do not shed under normal conditions. MIXED DENTITION:a stage of development during which the primary and permanent teeth function together in the mouth.Also called:TRANSITIONAL ON Humans have two sets of teeth in their lifetime.The first set of teeth to be seen in the mouth is the primary or deciduous dentition,which begins to prenatally at about 14 weeks in utero and is co m leted postnatally at f age.In the absenc of congenital disorders,dental disease or trauma,the first teeth in this dentition begin to appear in the oral cavity at the mean age of 6.and the last emerge at a mean age of 28t4 months.The deciduous dentition remains intact(barring loss from dental caries or trauma) until the child is about 6 years of age At about that time the first succeda neous or permanent teeth begin to emerge into the mouth.The emergence of these teeth begins the transitional or mixed dentition period in which there is a mixture of deciduous and succedaneous teeth present.The transition period lasts from about 6 to 12 years of age and ends when all the deciduous teeth have been shed.At that time the pe nanent dentition pe od be gins Thus,t transition from h primary dentition to the permanent dentition begins with the emergence of the first permanent molars,shedding of the deciduous incisors,and emergence of the permanent incisors.The mixed dentition period is often a difficult time for the young child because of habits,missing teeth,teeth of different colors and wding of the teeth,and malpose teeth The permanent,or suc edaneous,teeth replace the exfoliated deciduous teeth in a sequence of eruption that exhibits some variance.After the shedding of the deciduous canines and molars,emergence of the permanent canines and premolars,and emergence of the second permanent molars,the -3-DENTITION - 3 - CHAPTER 1. DENTITION DENTITION Humans have two sets of teeth in their lifetime. The first set of teeth to be seen in the mouth is the primary or deciduous dentition, which begins to form prenatally at about 14 weeks in utero and is completed postnatally at about 3 years of age. In the absence of congenital disorders, dental disease, or trauma, the first teeth in this dentition begin to appear in the oral cavity at the mean age of 6, and the last emerge at a mean age of 28±4 months. The deciduous dentition remains intact (barring loss from dental caries or trauma) until the child is about 6 years of age. At about that time the first succedaneous or permanent teeth begin to emerge into the mouth. The emergence of these teeth begins the transitional or mixed dentition period in which there is a mixture of deciduous and succedaneous teeth present. The transition period lasts from about 6 to 12 years of age and ends when all the deciduous teeth have been shed. At that time the permanent dentition period begins. Thus, the transition from the primary dentition to the permanent dentition begins with the emergence of the first permanent molars, shedding of the deciduous incisors, and emergence of the permanent incisors. The mixed dentition period is often a difficult time for the young child because of habits, missing teeth, teeth of different colors and hues, crowding of the teeth, and malposed teeth. The permanent, or succedaneous, teeth replace the exfoliated deciduous teeth in a sequence of eruption that exhibits some variance. After the shedding of the deciduous canines and molars, emergence of the permanent canines and premolars, and emergence of the second permanent molars, the CONCEPTS DENTITION: the teeth in the dental arch. PRIMARY DENTITION: the teeth that erupt first and are normally shed and replaced by permanent (succedaneous) teeth. Also called: DECIDUOUS DENTITION. PERMANENT DENTITION: the teeth that erupt after the primary dentition that do not shed under normal conditions. MIXED DENTITION: a stage of development during which the primary and permanent teeth function together in the mouth. Also called: TRANSITIONAL DENTITION