Tooth Exfoliation and Eruption Dates - Tagged PDF

Tooth Exfoliation and Eruption Mrs Priti Songra, Tutor Dental Therapist GDC Learning Outcomes: 1.15, 1.16, 1.2.4, 1.2.5, 1.2.7, 1.7.7, 1.8.3, 8.2 1 Aim: To enable the student to understand the sequence and importan...

Tooth Exfoliation and Eruption Mrs Priti Songra, Tutor Dental Therapist GDC Learning Outcomes: 1.15, 1.16, 1.2.4, 1.2.5, 1.2.7, 1.7.7, 1.8.3, 8.2 1 Aim: To enable the student to understand the sequence and importance of the chronology for eruption and exfoliation of primary dentition, and eruption of secondary dentition 2 Learning Outcomes To know the terminology used in the eruption and exfoliation sequence Understand the reasons why we need to learn these; knowing normal from abnormal To know calcification dates – primary and permanent dentition To know eruption dates – primary and permanent dentition To know exfoliation dates – primary dentition 3  Reasons for Learning Eruption/Exfoliation Patterns  Primary teeth hold a place in the jaw for the permanent teeth, which move into place as primary teeth are shed  Know and understand the normal sequence of exfoliation and eruption to determine the deviations from normal  Gender specific – girls’ dentition erupt sooner than boys’ delayed-tooth-eruption.jpg (275×183) (ctkidsdentist.com) 4 Impact to Permanent Dentitions - Systemic or Local  Systemic – can cause delayed eruption, non formation (missing dentition) or Molar-Incisor Hypomineralisation (MIH)  Genetic  Nutrition  Metabolic - hormonal disorders/endocrine disorders  Pyrexia – systemic infections  Diseases – kidney/cancer  Medications – chemotherapy/ epilepsy drugs eg phenytoin  Fluorosis  Other – low birth weight/smoking environment 5 Impact to Permanent Dentitions - generalised or localised  Local - can cause delayed eruption, non formation (missing dentition) or Molar-Incisor Hypomineralisation (MIH)  Early loss of deciduous teeth – why could this happen?  Impacted teeth/misplaced/ectopic teeth – permanent teeth may be out of position - Most commonly maxillary 3’s and mandibular 8’s  Missing dentition – usually maxillary 2s and mandibular 8s  Supernumerary teeth  Trauma  Gingival hyperplasia/fibrosis  Oral Clefts  Eruption Cysts 6 Tooth Chronology Deciduous Dentition 1 TOOTH INITIAL COMPLETION COMPLETION (MAXILLARY) CALCIFICATION OF CROWN ERUPTION OF ROOTS First Incisor (A) 3-4 months in utero 4 months 7.5 months 1.5-2 years (IU) Second Incisor 4-5 months in utero 5 months 8 months 1.5-2 years (B) (IU) Canine (C) 5 months in utero (IU) 9 months 16-20 months 2.5-3 years First molar (D) 5 months in utero (IU) 6 months 12-16 months 2-2.5 years Second Molar (E) 6months in utero (IU) 10-12 months 1.75-2.5 years 3 years 7 Tooth Chronology Deciduous Dentition 2 TOOTH INITIAL COMPLETION COMPLETION (MANDIBULAR) CALCIFICATION OF CROWN ERUPTION OF ROOTS First Incisor (A) 4-5 months in utero 4 months 4 months 1.5-2 years IU) Second Incisor (B) 4-5 months in utero 4.5 months 4.5 months 1.5-2 years (IU) Canine (C) 5 months in utero 9 months 9 months 2.5-3 years (IU) First molar (D) 5 months in utero 6 months 6 months 2-2.5 years (IU) Second Molar (E) 6 months in utero 10-12 months 10-12 months 3 years (IU) 8 Order of Eruption – Deciduous Dentition  Maxillary A B D C E  Mandibular A B D C E 9 Tooth Eruption Chronology – Permanent Dentition 1 10 Tooth Eruption Chronology – Permanent Dentition 2 11 Order of Eruption – Permanent Dentition Maxillary 6 1 2 4 5 3 7 8 Mandibular 6 1 2 3 4 5 7 8 12 Dentopantomograph (DPT) of Mixed Dentition NB – note missing UL/UR2 NB – note missing LL5 13 Delayed Eruption/Impacted Upper Right Canine https://www.bing.com/images/ 14 Impacted 8s 15 Impact to Permanent Dentitions - generalised or localised Primary tooth infection can damage the permanent teeth developing under them Photo courtesy of KCL Paediatric Dept 16 Impact to Permanent Dentitions - generalised or localised  Need for orthodontic  Trauma to primary teeth can assessment/intervention affect the permanent successor orthodontic assessment - Bing images https://www.iadt- dentaltrauma.org / 17 Eruption Cysts Tooth Eruption Cyst - Bing images NigerJClinPract_2017_20_9_1216_217244_f4.jpg (813×298) (njcponline.com) 18  Comparison of Radiograph and Teeth Present f7cb9453b04a1ce8cd862d5fb7c5bcc5.jpg (2076×857) (pinimg.com) atlas_of_tooth_development_in_English.pdf (qmul.ac.uk) 19 References  Beek, G.C.v (1983) Dental Morphology, An illustrated Guide. 2nd Edition. Bristol: John Wright & Sons Ltd.  Leeds University (2014) Tooth Morphology Lab. [online] Available at: http://www.dentistry.leeds.ac.uk/students/vlab/morphology/ [Accessed 20 March 2021].  AlQahtani S J (2008). Atlas of tooth development and eruption. Barts and the London School of Medicine and Dentistry. London, Queen Mary University of London. MClinDent.  Chronology of eruption and exfoliation, King’s College London, School of Hygiene and Therapy, accessed 2006 20