# Deep Bite Management > Deep bite management for NEET-MDS Orthodontics: true versus pseudo deep bite, bite planes, utility and intrusion arches, curve of Spee leveling and retention. - Canonical URL: https://prepelephant.com/topics/neet-mds/orthodontics/deep-bite-mds - Exam / course: NEET-MDS · Subject: Orthodontics - Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team - First published: 2026-10-02 - Last updated: 2026-10-02 - How to cite: "Deep Bite Management", PrepElephant, https://prepelephant.com/topics/neet-mds/orthodontics/deep-bite-mds ## Direct answer Overbite that traps the lower incisors against the palate or upper incisors against the labial gingiva — beyond about 3 mm of vertical overlap, or covering more than two-thirds of the lower crowns — is a deep bite, and its first subdivision is therapeutic: a true deep bite combines excessive overlap with a reduced lower anterior face height (the Class II division 2 prototype), while a pseudo deep bite deepens secondarily to attrition with a normal face height, and requires restoration of the lost vertical dimension rather than pure intrusion. Correction then proceeds by three levers chosen for growth status and facial pattern — molar extrusion in growers with flat-to-normal mandibular planes, true incisor intrusion with utility or intrusion arches (or miniscrews) in adults and high-angle faces, and Le Fort I impaction with autorotation where vertical maxillary excess drives the trait — closed by retention with a bite-plane retainer, since deep bite is among the most relapse-prone of corrections. ## What you must remember - Definitions: normal overbite 2-3 mm or one-third to one-half of the lower crown; a complete deep bite contacts palatal mucosa or gingiva and constitutes traumatic occlusion demanding priority. - True deep bite: reduced lower anterior face height, Class II tendency, excessive curve of Spee, deep mentolabial fold; pseudo deep bite: normal face height, generalised attrition, deepened by wear. - Three-component analysis: over-erupted incisors, excessive curve of Spee, under-erupted molars — each dictates one lever of mechanics. - Growing patients: anterior bite planes disocclude the posteriors so molars erupt and the mandible rotates forward — extrusive levelling is appropriate only in low to normal angle, growing faces. - Incisor intrusion: Ricketts' utility arch bypassing the buccal segments to intrude and torque the incisors with light force (15-20 g per incisor region); Burstone's intrusion arch with an auxiliary to the segment; Begg mechanics use anchor bends on 0.016 round Australian wire to intrude incisors as an anchorage consequence. - Adults and high-angle faces: extrusion relapses and lengthens the face — intrude with miniscrews or accept surgical impaction for vertical maxillary excess. - Trauma hierarchy: palatal stripping and lower labial gingival trauma from incisal edges prioritise deep-bite correction in sequencing. - Retention: Hawley-type retainer with a flat anterior bite plane worn nights, because both extrusion and intrusion relapse without it. ## Correcting a division 2 deep bite A 14-year-old girl presents with a Class II division 2 malocclusion: overbite 7 mm, lower incisors striking palatal mucosa with a localised gingival furrow, deep curve of Spee, and a horizontal growth pattern — still growing, which is her greatest asset. Step one relieves the trauma: a removable anterior bite plane worn full-time disoccludes the posteriors, allowing mandibular development while the appliance plan is made. Step two aligns and corrects torque: division 2 mechanics begin with alignment on light wires, then deliberate labial root torque of the retroclined upper incisors — the bite often deepens transiently as incisors upright. Step three levels the curve of Spee to her facial pattern: in a horizontal grower, a bite-plane effect within the fixed appliance lets molars erupt and the curve flattens extrusively; where intrusion is chosen, a utility arch delivers 15-20 g of true incisor intrusion while the molars remain untouched. Step four addresses the Class II sagittal discrepancy — functional appliance or headgear as growth permits. Step five retains with a deep-bite retainer carrying a bite plane and reviews the traumatized palatal mucosa, which recovers once the trauma is removed. Contrast her 26-year-old sister: no growth remains, extrusion would rotate the mandible down and back, and her plan leans on miniscrew intrusion or Le Fort I impaction. ## Where students slip The pattern error is extruding molars in every deep bite: in the adult or high-angle face, extrusion lengthens the face, rotates the mandible backward and relapses — name the facial pattern before naming the wire. The second slip is forgetting that straight-wire levelling of a deep curve of Spee itself extrudes incisors; genuine intrusion requires utility, intrusion-arch or screw mechanics, not passive hope. The third is definitional: offering intrusion to an attritive pseudo deep bite mistakes the problem — lost tooth structure — and restoration is the actual treatment. ## Frequently asked questions ### What distinguishes true from pseudo deep bite? True deep bite has a reduced lower anterior face height with genuine vertical overlap excess; pseudo deep bite has a normal face height with the bite deepened secondarily by attrition. ### How does an anterior bite plane correct deep bite? It disoccludes the posterior teeth, permitting molar eruption and forward mandibular rotation in a growing patient — the effect is extrusive levelling, appropriate only in growing, low to normal angle faces. ### Who designed the utility arch and what does it do? Ricketts; a bypass arch from the molars to the incisors delivering true incisor intrusion with torque at light force, leaving the buccal segments untouched. ### Why is molar extrusion avoided in adults? Without growth, extrusion relapses, rotates the mandible down and back, lengthens the face and worsens the profile — intrusion or surgery is the stable route.