21-State of dentition.pdf

State of dentition at different ages Dr Sandeep Gupta Assistant Professor The state of dentition At Birth Deciduous Teeth Half crown of lower A. Less than half crown of lower B. Cusp tip of lower C Occlusal 1/3 of lower D& cusp tips of E. Permanent Teeth Mesiolingual cusp tip of lower 6 The state of...

State of dentition at different ages Dr Sandeep Gupta Assistant Professor The state of dentition At Birth Deciduous Teeth Half crown of lower A. Less than half crown of lower B. Cusp tip of lower C Occlusal 1/3 of lower D& cusp tips of E. Permanent Teeth Mesiolingual cusp tip of lower 6 The state of dentition At 6 Months old Deciduous Teeth lower A erupted & 1/3 of root formed. lower B not erupted & less 1/3 of root formed More parts of lower C,D & E are formed. Permanent Teeth Incisal thirds of 1 & 2 are formed. Cusp tip of lower 3 is formed. Occlusal1/3 of lower 6 is formed. The state of dentition At 3 Years old Deciduous Teeth All are formed with their roots. Permanent Teeth Crowns of lower 1&2 not completed yet Half crown of lower canine. Parts of lower 4 & 5 are formed. Crown of lower 6 is completed. Occlusal 1/3 of lower 7 is formed. The state of dentition At 6 year old Deciduous Teeth lower A may be shedded & replaced lower 1. B, C & D show different amounts of root resorption. E starts root resorption at 7 years old. Permanent Teeth Lower 1 erupted with 1/3 root is formed. Lower 2 not erupted with less than 1/3 root is formed. Crowns of lower 3,4 & 5 may be completed. Lower 6 is erupted with 1/3 of root is formed. Crown of lower 7 is not completed yet. The state of dentition At 9 Years old Deciduous Teeth All primary teeth are shedded except second molar E Permanent Teeth Lower 1 is erupted with full root. Lower 2 is erupted without full root. Lower 3 may be erupted with 1/3 root is formed. Lower 4 & 5 are not erupted yet. Lower 6 is erupted with full root. Crown of lower 7 is completed with less than 1/3 root. Lower 8 begins calcification. The state of dentition At 12 Years old Deciduous Teeth All primary teeth are shedded Permanent Teeth All teeth are erupted except lower 8. All root are completed except lower 7. Thank You