Chronology of primary and permanent dention
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This document discusses the chronology and emergence patterns of primary and permanent teeth. It defines chronology as the study of the timing of tooth development from initiation to emergence and completion. It outlines the typical sequence of primary tooth emergence and the mixed dentition period between primary and permanent teeth. The chronology of permanent teeth is from ages 6 to 25 years if third molars are included. Understanding chronology is important for avoiding damage to developing teeth during treatment and for assessing growth or unknown ages.
Chronology of primary and permanent dention
- 1. CHRONOLOGY OF PRIMARY AND PERMANENT DENTITION. M. BHARATH REDDY
- 2. OBJECTIVES • INTRODUCTION • DEFINITION • TYPES • CHRONOLOGY OF PRIMARY DENTITION • MIXED DENTITION PERIOD • CHRONOLOGY OF PERMANENT DENTITION • SIGNIFICANCE OF CHRONOLOGY
- 3. INTRODUCTION • Chronology of dentition is based upon data of Logan and kronfeld reported in 1933. • Careful review was done by • masseler and shour in 1941. • morrees and fanning and hunt in 1963 • kraus and jordan in 1965 • Nystrom in 1977
- 4. DEFINITION • Chronos-time • Logos-study • Chronology is defined as “a study which deals with the timings of various stages of tooth development. starting with the initiation of the first dental tissue laid down to the emergence of tooth in the oral cavity and its completion of calcification”.
- 5. Age of attainment Types of chronologies Age of prediction Maturity assesment
- 6. • AGE OF ATTAINMENT: 3. IT IS BASED UPON TOOTH EMERGENCE 5. IT IS USED CLINICALLY TO AVOID DAMAGE TO DEVELOPING TOOTH DURING TREATMENT
- 7. • AGE OF PREDICTION: 3. IT IS BASED ON THE AVERAGE AGE OF THE SUBJECTS IN A STAGE OF DEVELOPMENT 5. AGE PREDICTION ARE USED FOR ASSESSING UNKNOWN AGE OF PATIENTS AND FORENSIC ARCHEALOGICAL APPEARANCE
- 8. MATURITY ASSESSMENT: 3. HERE THE STAGES ARE AVERAGED RATHER THEN SUBJECT AGES. 5. SUCH SCALES ARE USEFUL WHEN MATURITY IS ASSESSED OF KNOWN AGE
- 9. CHRONOLOGY OF PRIMARY DENTITION
- 11. SEQUENCE OF EMERGENCE OF PRIMARY TEETH • THE PREDOMINAT SEQUENCE OF ERUPTION OF PRIMARY TEETH IN THE INDIVIDUAL JAW IS • (A) CENTRAL INCISOR • (B) LATERAL INCISOR • (D) FIRST MOLAR • (C) CANINE • (E) SECOND MOLAR
- 12. SEQUENCE OF ERUPTION AB D C E A B D CE
- 14. MIXED DENTITION PERIOD • THE FIRST MIXED DENTITION BEGINS WITH THE EMERGENCE AND ERUPTION OF MANDIBULAR FIRST PERMANENT MOLARS • IT ENDS WITH THE LOSS OF THE LAST PRIMARY TOOTH WHICH USUALLY OCCURS AT 11-12YRS
- 15. PERMANENT DENTITION IS COMPLETED FROM 18 TO 25 YRS Of AGE IF 3RD MOLAR INCLUDED
- 16. CHRONOLOGY OF PERMANENT DENTITION
- 17. Importance of chronology • TO AVOID TREATMENT THAT CAN DAMAGE DEVELOPING TEETH • TO ASSESS UNKNOWN AGE OF THE PATIENT • TO ASSESS GROWTH • TO AVOID MALFORMATIONS OF THE TEETH
- 18. REFERENCES • WHEELER’S • SHOBHA TANDON • INTERNET