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Development and eruption of dentition /certified fixed orthodontic courses by Indian dental academy

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Welcome to Indian Dental Academy …

Welcome to Indian Dental Academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.


Indian dental academy has a unique training program & curriculum that provides students with exceptional clinical skills and enabling them to return to their office with high level confidence and start treating patients

State of the art comprehensive training-Faculty of world wide repute &Very affordable.

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  • 1. Development and eruption of teeth INDIAN DENTAL ACADEMY Leader in Continuing Dental Education www.indiandentalacademy.com www.indiandentalacademy.com
  • 2. Applications of development &eruption of teeth Clinical practice forensics odontology Anthropology www.indiandentalacademy.com
  • 3.  During infancy dental age is estimated by1. No. of teeth present in the oral cavity2. Stages of eruption of teeth3. Formation of crowns & roots of the teeth at each chronological age During the period of mixed dentition , it is assessed on the basis of1. Erupted teeth present2. The amount of resorption of the roots of the primary teeth3.The amount of development & presence of permanent teeth www.indiandentalacademy.com
  • 4. Eruption : it is a process by which tooth moves withinthe jaw bones, comes out into the oral cavity & comesup to the occlusal contact & maintains its clinical position or continuous tooth movement from the dental bud to occlusal contactClinical considerations• Diagnosis & management of most disorders involving the size,shape, number, arrangement of teeth• Malformations : enamel hypoplasia www.indiandentalacademy.com
  • 5. Development of primary teeth Enamel organs do not all develop at the same rate resulting in different times of eruption for different groups of teeth Not all the primary teeth are lost at the same time Primary dentition is completely formed about the age of 3 Calcification of the primary teeth begins in utero - 13 -16 weeks postfertilization Primary tooth crown formation – 2-3 years from initial calcification to root completion. Crown formation of primary teeth continues after birth 3 months – CI, 4 months – LI, 7 months – 1 M 8.5 months – C, 10.5 months – 2M www.indiandentalacademy.com
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  • 7. Chronology of primary dentition Tooth First Crown Eruption Root (Upper) evidence of Completed ( Mean completed calcificatio ( months) age) ( Years) n( Weeks ( months) in utero) i1 14 1½ 10 1½ i2 16 2½ 11 2 c 17 9 19 3¼ m1 15 6 16 2½ m2 19 11 29 3 www.indiandentalacademy.com
  • 8. Tooth First Crown Eruption Root(lower) evidence of Completed ( Mean completed calcificatio ( months) age) ( Years) n( Weeks ( months) in utero)i1 14 2½ 8 1½i2 16 3 13 1½c 17 9 20 3¼m1 15½ 5½ 16 2¼m2 18 10 27 3 www.indiandentalacademy.com
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  • 11. Sequence of emergence ofprimary teethCentral incisor (A)Lateral incisor ( B)First molar (D)Canine (C)Second molar (E)A,B, D, C, E – upper & lower www.indiandentalacademy.com
  • 12.  Primary dentition is completed – 30 months or second primary molars in occlusion No changes from about 30 months – 6yrs of age Decidiuous teeth are most important during first years of greatest physical & mental development Important factors in the intiation & development of abnormal occlusion1. Insufficient space2. Early loss of decidiuous teeth3. Overretention of decidiuous teeth4. Congenital absence of teeth5. Dental anamolies www.indiandentalacademy.com
  • 13. Transitional ( Mixed)dention period• First transition dentition begins with eruption of mandibular first permanent molars• Transition ends with loss of lost of last primary teeth at about the age of 12 yrs• Transition period lasts – 6 - 7yrs• Eruptive movements of permanent teeth begin after crown completion.• During eruption, permanent mandibular first molars is guided by the distal surface of second primary molar www.indiandentalacademy.com
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  • 15. Permanent dentition Initiation of the formation of permanent dentition takes place in 3 steps1. CI, LI, C, M1 – 1st yr2. premolars & second molars – 2-4 yr3. Third molars – 5-7 yrs First molars are the first teeth of permanent dentition to emerge through the gingiva First molars often called – „ 6 years molars‟ They emerge distal to the decidiuous second molar Second permanent tooth to emerge – CI Permanent mandibular CI erupts before the maxillary CI www.indiandentalacademy.com
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  • 17. Ligual to the roots of decidiuous inscisors are the follicles of the developing incisors & caninesDeveloping premolars are within the bifurcation of primary molar roots Permanent incisors, Canines& Premolars are called Succedaneous teeth. After mandibular CI, LI erupts soon followed by maxillary CI Maxillary LI erupts after about a year Premolars follow the maxillary laterals in sequence at the age of 10 - 11 yrsMandibular canines appear at the same timeAfter 1yr second premolar erupt & the maxilary canine follow www.indiandentalacademy.com
  • 18. Second molars erupt at the age of about 12 yrsSecond molars are called as “ 12 year molars”Third molar erupt at the age of 17 –25 yrsSequence of eruption of permanent dentitionMaxillary teethFirst molars – M1Central incisor - CILateral incisor - LIFirst premolar – P1Second premolar – P2Canine - CSecond molar – M2Third molar – M3 www.indiandentalacademy.com
  • 19. Mandibular teethFirst molars – M1Central incisor - CILateral incisor - LICanine - CFirst premolar – P1Second premolar – P2Second molar – M2Third molar – M3 www.indiandentalacademy.com
  • 20. Chronolgy of permanent dentitionTooth First Crown Eruption Root(Upper) evidence of Completed( ( Mean age) completed calcification months) ( months) ( Years)i1 3 –4mo 4-5yr 7 – 8 yrs 10i2 10 – 12 mo 4 –5yr 8 – 9 yr 11c 4 – 5 mo 6 –7yr 11- 12yr 13 - 15P1 1½ - 1¾yr 5 –6yr 10 –11yr 12 -13P2 2 - 2¼yr 6 – 7yr 10 –12yr 12 -14M1 At birth 2 ½ - 3 yr 6 – 7 yr 9 -10M2 2 ½ -3yr 7 – 8 yr 12 –13yr 14 - 16M3 7 – 9yr www.indiandentalacademy.com 12 –16 yr 17 –21yr 18 -25
  • 21. Tooth First Crown Eruption Root(Lower) evidence of Completed( ( Mean age) completed calcification months) ( months) ( Years)i1 3 –4mo 4 - 5yr 6 – 7 yrs 9i2 3 – 4 mo 4 –5yr 7-8 yr 10c 4 – 5 mo 6 –7yr 9 - 10yr 12 - 14P1 1¾- 2yr 5 –6yr 10 –12yr 12 -13P2 2 - 2¼yr 6 – 7yr 11 –12yr 13 -14M1 At birth 2 ½ - 3 yr 6 – 7 yr 9 -10M2 2 ½ -3yr 7 – 8 yr 11 –13yr 14 - 15M3 8 – 10yr 12 –16 yr 17 –21yr 18 -25 www.indiandentalacademy.com
  • 22.  Variation of 12 –24 months ( early or late ) of the expected eruption is considered normal Deciduous teeth – 4 –8 months is considered normal www.indiandentalacademy.com
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  • 25. Thank you for watchingwww.indiandentalacademy.com www.indiandentalacademy.com