NEET MDS Shorts
24956
OrthodonticsThe high labial-bow is typically used for molar retraction and is not designed for incisor retraction. In contrast, Roberts retractors, split labial-bows, and apron springs are all instruments that can be used effectively for retracting incisors during orthodontic treatment.
31656
Orthodontics
SOLUTION The mesial incline of the upper canine occludes with the distal incline of the lower [canine]; the distal incline of the upper canine occludes with the mesial incline of the buccal cusp of the lower first premolar.
88098
OrthodonticsVestibular appliances are designed to influence the vestibular musculature and include oral screen, lip bumper, and Frankel appliance. The activator is an intraoral functional appliance, not vestibular.
74776
Orthodontics
SOLUTION According to Simon, in normal arch relationship, the orbital plane passes through the distal axial aspect of the maxillary canine Malocclusions described as anteropostenor deviations based on their distance from the orbital plane are as follows: 1. Protraction: The teeth, one or both, dental arches, andYor jaws are too far forward, i.e. placed forward or anterior to the plane as compared to the normal where the plane passes through the distal incline of the canine. 2. Retraction: The teeth, one or both dental arches and/or jaws are too far backward, i.e. placed posterior to the plane than normal
Simon used the orbital plane (a plane perpendicular to the F-H plane at the margin of the bony orbit directly under the pupil of the eye).
36963
Orthodontics
SOLUTION Optimum orthodontic force is one, which moves teeth most rapidly in the desired direction, with the least possible damage to tissue and with minimum patient discomfort. Oppenheim and Schwarz following extensive studies stated that the optimum force is equivalent to the capillary pulse pressure, which is 20-26 gm/sq. cm of root surface area. From a clinical point of view, optimum orthodontic force has the following characteristics: From a histologic point of view the use of optimum orthodontic force has the following characteristics: 1) The vitality of the tooth and supporting periodontal ligament is maintained
1) Products rapid tooth movement
2) Minimal patient discomfort
3) The lag phase of tooth movement is minimal
4) No marked mobility of the teeth being moved
2) Initiates maximum cellular response
3) Produces direct or frontal resorption
15034
OrthodonticsThe lymphoid system, which includes lymph nodes, spleen, and other lymphatic tissues, undergoes significant growth during childhood. By the age of 9-10 years, the lymphoid tissue can reach approximately 200% of its adult size due to the increased demand for immune function during this period. This growth is part of the body's preparation for increased exposure to pathogens as children interact more with their environment.
61420
Orthodontics
SOLUTION The key to success is to use an appliance that is both comfortable, easily retained and predictable such as a simple Hawley retainer with recurve springs or a fixed labial-lingual appliance (including a vertical removable arch for ease of adjustment with a recurve spring to jump the cross-bite). Both of these appliances work by tipping the maxillary teeth forward so they are in a normal dental relationship to the mandibular teeth. Once this is accomplished, it will allow future coordinated growth between the maxilla and the mandible
24182
Orthodontics
SOLUTION Children and adults with a skeletal Class II relationship and an underlying skeletal Class II jaw relationship position the mandible forward in a “Sunday bite,” making the occlusion look better than it really is.
14634
Orthodontics
The ugly duckling stage refers to the transient malocclusion seen during the eruption of maxillary canines, where the upper central incisors show spacing and flaring. It typically occurs when the maxillary canines erupt, exerting pressure on the roots of the lateral incisors, which in turn causes the crowns of the central incisors to flare apart. This stage is self-correcting once the canines fully erupt and the incisors return to normal alignment.
51862
OrthodonticsPassive tooth-borne functional appliances are removable and do not require active muscle participation, such as Andersen activator, Woodside and Hawley activator, and expansion activator. The Herbst appliance is a fixed functional appliance.