NEET MDS Shorts
71069
OrthodonticsThe servo system theory, which relates to the control mechanisms in orthodontics, was proposed by Petrov ic (option 2). This theory helps in understanding how forces applied to teeth can be controlled and adjusted to achieve desired tooth movements during orthodontic treatment.
55237
OrthodonticsIn a homogeneous population, the genetic variation is less compared to a heterogeneous population. Malocclusion is influenced by both genetic and environmental factors. A homogenous population, which is more genetically similar, would be expected to have a more uniform expression of dental traits, including a lower incidence of malocclusion, assuming that the specific genetic factors for malocclusion are not prevalent in that particular population. In a heterogeneous population, the greater genetic diversity can lead to a higher incidence of malocclusion due to a wider range of genetic combinations contributing to dental misalignments.
29493
OrthodonticsIndicators for Class II activator include mandibular retrusion, horizontal/anterior mandibular growth, and upright lower anteriors. Crowding in lower anteriors is not a specific indicator for its use.
90838
OrthodonticsPterygoid muscle response to the activator is typically evaluated after 6-8 weeks of wear to assess adaptation and growth stimulation.
47857
Orthodontics
In a child with a skeletal Class I relationship and slight overjet, thumb sucking can contribute to the maintenance of the overjet due to the anterior teeth being pushed forward by the thumb. If the child discontinues thumb sucking, the anterior teeth may naturally reposition themselves, leading to a reduction in overjet.
Option 2 is incorrect because while the eruption of permanent canines can influence the occlusion.
Option 3 is also incorrect; the lower incisors would not necessarily incline labially if the thumb sucking habit is stopped.
57056
Orthodontics
SOLUTION Stress is the force applied per unit area while strain can be defined as the internal distortion per unit area.
Stress and strain are inter-related terms as stress is an external force acting upon a body while strain is the resultant of stress on that body.
Strain can be expressed in the form of a change in either the external dimension or internal energy of the body.
59209
OrthodonticsEarnest Klein's classification of habits distinguishes between intentional habits (those that are consciously performed) and non-intentional habits (those that occur unconsciously or without deliberate intention). This classification helps in understanding the nature of habits, particularly in the context of dental and orthodontic practices.
88280
OrthodonticsOne of the main disadvantages of using a loop lingual arch to upright the first molar is that it can lead to flaring of the mandibular incisors due to the forces applied.
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.
52558
Orthodontics
Reverse labial bow is so called as activation of the bow is done by opening the U-loop, instead of compressing as is seen in the conventional labial bows.