Deep bite.pptx over bite Deep bite.pptx over bite

Deep bite
Over bite

1. Contents Types of deep bite Etiology

2. INTRODUCTI O N Deep overbite is one of the most common malocclusion seen in children as well as in adults. One of the major challenges in orthodontics has been and still continues to be the correction of deep overbite. It is one of the frequently seen malocclusions.

3. DEFINITION STRANG has defined overbite as overlapping of the upper incisors over the lower in a vertical plane. He described average overbite as equal to one third the length of the maxillary incisor.

4. GRABER has defined deep bite as a condition of excessive overbite, where the vertical measurement between the maxillary and mandibular incisal margins is excess when the mandible is brought into habitual or centric occlusion.

5. 2-3-mm Traumatic>7mm N o n T ra u ma t i c ; 5 - 7 mm

6. ‘The amount and percentage of overlap of lower incisors by the upper incisors . The overbite may be calculated as a percentage of the clinical crown height of one of the ma nd i bu l ar ce n tral inciso r s. ’ (NA N D A )

7. Deep bite according to its origin Dental deep bite occur to due to over eruption of anteriors and/or infraocclusion of molars , This type characterized by absence of any skeletal complicating features. Simple deep curve of Spee in the mandibular Reverse curve of Spee in the maxillary dentition A. Dental deep bite (simple)

8. B. Skeletal deep bite (complex) Skeletal deep bite usually genetic origin, and caused by upward and Forward rotation of the mandible, and its characterized by: 1. Patients exhibit a horizontal growth Patton 2. The anterior facial height is reduced 3. A reduced inter- occlusal clearance 4. A cephalometric examination Complex deep bite is frequently associated with class 11 div 2 and occasionally with Class III

9. Skeletal Deep bite: The skeletal deep bite is characterized by a reduction in the mandibular plane angle and a decrease in the vertical height of the maxilla, which has been described as the short face syndrome. Mandibular growth is predominantly horizontal. The palatal ,occlusal, mandibular and supra orbital planes are horizontal and almost parallel to each other. The upper face height is more than the lower face height.

10. A. Hereditary It is a malocclusion type in families due to genetic factors. Particularly, a common cause is when the lower jaw (or maxilla) is small, and in general, the vertical mandible grows toward the maxilla.

11. Habits a. lateral Tongue thrust swallow b. Finger sucking, c. Lip sucking

12. CLASSIFICATION Deep bite is classified into Deep bite Copmplete Traumatic bite ■ skeletal deep bite. ■ dentoalveolar deep bite

13. Skeletal deep bite T h e y a r e usuall y o f g e n e ti c o r i g i n . It i s c aus e d b y : U p w a r d an d fo r w a r d r otat i o n o f m and i b l e . D o w n w a r d an d ba c k w a r d i n c l i n a t i o n o f m ax ill a . Combination. 1 . S ke l e t a l re l a t ion s h i p du e t o u p w ar d a n d f o r w ar d r o t a t io n o f ma ndibl e 2. Skeletal deep bite due to downward and backward rotation of maxilla 3 . C omb i n a t i o n o f 2 & 3.

14. Dentoalveolar Deep bite : This kind of deep bite is characterized by the absence of any skeletal complicating features which are seen in skeletal deep bite. Dental deep bite occur due to: 1. Over eruption of anteriors. (TRUE DEEP BITE) 2. lnfra occlusion of molars. ( PSEUDO DEEP BITE)

15. Deep bite due to infraocclusion of molars Deep bite due to over eruption of anteriors

16. 1) Deep bite due to over eruption of anteriors : Dental deep bite associated with over eruption of lower incisors are usually seen in class II malocclusions. The presence of an increased overjet allows the lower incisors to over erupt until they meet the palatal mucosa. These patients exhibit an excessive curve of spee. The inter occlusal clearance is usually normal as the molars are fully erupted.

17. 2) Deep bite due to infra occlusion of molars: Deep bites can occur due to infra occlusion of the molars. The presence of a lateral tongue posture or lateral tongue thrust may prevent the molars from erupting to their normal occlusion level. lt can also occur due to premature loss of posterior teeth. Deep bite caused by infra occlusion of molars are characterized by the presence of partially erupted molars (i.e. reduced crown height ) and large inter-occlusal clearance.

18. A. Complete over bite B. Incomplete over bite Deep bite depending on the Extent of deep bite An incisor relationship in which the lower incisor fails to occlude with either the upper incisors or the mucosa of the palate when teeth are occluded. An incisor relationship in which lower incisor contacts the palatal surface of the upper incisors or the palatal tissue when the teeth are in centric occlusion

19. DIAGN O SIS The routine diagnostic aids such as clinical examination, study models and lateral cephalograms are used for the diagnostic exercise. We should be able to differentiate skeletal deep bite from dental deep bites. Lateral cephalometric analysis of the skeletal pattern helps in diagnosing a skeletal deep bite.

20. The mandible in skeletal deep bite shows certain distinct features: The ramus is broad anteroposteriorly with a big coronoid process indicating a strong temporalis muscle. Flaring of the gonial process laterally is seen indicating a strong masseter action, with the absence of the ante gonial notch. 3 )The ramus and corpus lengths are almost equal. 4)The mandibular symphysis is broad antero posteriorly but short vertically.