#1 Classification of Malocclusion 2024.ppt

ORTHO I COURSE OVERVIEW, NTRODUCTION TO DENTAL OCCLUSIO AND CLASSIFICATION SARAH ABU ARQUB “I’m going to be a General Dentist – what do I really need to know about Ortho?”  Diagnosis Orthodontic Appliances...

ORTHO I COURSE OVERVIEW, NTRODUCTION TO DENTAL OCCLUSIO AND CLASSIFICATION SARAH ABU ARQUB “I’m going to be a General Dentist – what do I really need to know about Ortho?”  Diagnosis Orthodontic Appliances & Materials Orthodontic sI Treatment Planning and Interceptive Strategies Orthodontics Growth and Development New Way to Look at Patients Does this patient need orthodontic treatment? Would this patient benefit 15 yrs. old from orthodontic treatment? Initial Panorex Treatment options??? 1)Extract #T and align #29 2)Extract #T and #29 and place an implant to replace #29 Progress Progress Progress Progress Progress Progress Would orthodontics be useful in this case? 32 yr old female patient Introduction to Dental Occlusion  Overview of Lecture Development of occlusion Primary dentition Mixed dentition Class I, II and III occlusion Space maintainers Preventing occlusion problems Some Terms…  Overbite: Vertical overlap of Max teeth over Mand teeth  Overjet: Horizontal overlap of Max teeth over Mand teeth  Physiologic Occlusion: Ideal occlusion, Class I, promotes health and good function  Pathological Occlusion/Traumatic Occlusion: causes destruction of periodontium and wear of the teeth Some more terms…  Mixed Dentition: phase when some teeth are primary and some are permanent  Earliest indication is that permanent 1st molars and lower incisors have erupted  Mixed dentition analysis  Helps predict space available for permanent teeth  Moyers Space Analysis: the size of unerupted canines and premolars is predicted from the MD widths of mandibular incisors Moyers Mixed Dentition Analysis  Measure the greatest mesiodistal width of each of the four mandibular incisors. (X)  Measure the distance between the mesial of 1st permanent molar to the distal of the lateral incisor (Y) Moyers Mixed Dentition Analysis Classifications of Occlusion Class I Class II Class III  Development of AP Problems Mixed to Permanent Dentition Flush Terminal Plane Mesial Step Distal Step Class I Occlusion Class III Occlusion Class II Occlusion End on Class II Occlusion Occlusal Relationship of Primary and Permanent Teeth Normal Class I Molar End on Class II Molar Class I Molar End on Class II Molar Class II Molar Class III Molar Normal Findings in Primary Dentition  Primate Spaces  Leeway Space  Flush terminal plane occlusion  Primate Spaces  Normal spacing found in the primary dentition to accommodate width of wider permanent teeth  Maxilla: Space between lateral and canine  Mandible: Space between canine and first molar Proffit WR, Fields HW, Sarver DM. Contemporary Orthodontics. St. Louis, Mosby Elsevier, 2007, p. 86 Leeway space  The difference in the sum of the mesiodistal widths of primary and permanent teeth Primary canines, first molar and second molar Compared to… Permanent canines, first premolar and second premolar Mand: 3-4mm Max: 2.2.5mm Early loss of E: Permanent molar moves into space of E: A-P Classification of Malocclusion Etiology of Skeletal Class II  Maxillary Prognathism Etiology of Skeletal Class II  Maxillary Prognathism  Mandibular Retrognathism Etiology of Skeletal Class II  Maxillary Prognathism  Mandibular Retrognathism  Combination of both Skeletal and Soft Tissue A-P Classification Class I Class II Classification of Class II Malocclusion  Class II Division 1  Class II Division 2 Class II Division 2 Etiology of Class II Malocclusion  Mesial drift of maxillary first molars Premature loss of maxillary primary 2nd molars Ectopic eruption of 1st molars  Patient R.B. 7.9 yrs old Early loss of Primary Maxillary 2nd molars Class II molar relationship  Space Maintainers  Premature extraction of D  Band and loop  Unilateral  Premature loss of E  Distal Shoe  Prevents mesial migration of 6  Unilateral  If bilateral loss of E: lingual arch or Nance Space Maintainers Crown and loop Distal Shoe Nance Lingual Arch Band and loop Class II Subdivisions  Class II only on one side Etiology of a Skeletal Class III  Maxillary Retrognathism Etiology of a Skeletal Class III  Maxillary Retrognathism  Mandibular Prognathism Etiology of a Skeletal Class III  Maxillary Retrognathism  Mandibular Prognathism  Combination Skeletal and Soft Tissue Classification Class I Class II Class I Class II Class III Slightly Convex Convex Concave Classification of Class III Malocclusion  True  Skeletal  Dental  Pseudo Class III True Class III True Class III Pseudo Class III  Normal A-P skeletal relationship: Good profile  Dental prematurity produces an anterior shift  Dentoalveolar relationship There is no apparent skeletal discrepancy  Anterior teeth in cross-bite  Labial tipping of mandibular incisors and lingual of maxillary incisors Pseudo Class III Pseudo Class III  Functional Shift/ Interferences Problems with Numbers  Missing Teeth: Anodontia:complete absence of teeth, extremely rare, ectodermal dysplasia, partial anodontia is relatively more common Hypodontia: missing 1-5 teeth Oligodontia : missing >6 teeth Most common supernumerary tooth?  Answer: Midline mesiodens Problems with Space  Too much space  Large jaw and/or Small teeth  Too little space  Small jaw and/or Large teeth Quiz: Molar Classification What type of malocclusion is this? What type of malocclusion is this? Answer: Class II, Division I Full cusp right, End-on left What type of malocclusion is this? What type of malocclusion is this? Answer: Class III What type of malocclusion is this? What type of malocclusion is this? Answer: Class II, Division I What type of malocclusion is this? What type of malocclusion is this? Answer: Class I What type of malocclusion is this? What type of malocclusion is this? Answer: Class II, Division II What type of malocclusion is this? What type of malocclusion is this? Answer: Class II, Division I What type of malocclusion is this? What type of malocclusion is this? Answer: Class II subdivision left What type of malocclusion is this? What type of malocclusion is this? Answer: Class II subdivision left (with posterior crossbite) What type of malocclusion is this? What type of malocclusion is this? Answer: Class III What type of malocclusion is this? What type of malocclusion is this? Answer: Class II subdivision left What type of malocclusion is this? What type of malocclusion is this? Answer: Class I What type of malocclusion is this? What type of malocclusion is this? Answer: Class II, Division I What type of malocclusion is this? What type of malocclusion is this? Answer: Class I molar  Enough! Can we start the Weekend now? Questions? [email protected]