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Orthodontics NEET MDS Synopsis - Lecture Notes
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📖 Orthodontics

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Anterior Crossbite
Orthodontics

Anterior Crossbite

Anterior crossbite is a dental condition where one or more of the upper front teeth (maxillary incisors) are positioned behind the lower front teeth (mandibular incisors) when the jaws are closed. This misalignment can lead to functional issues, aesthetic concerns, and potential wear on the teeth. Correcting anterior crossbite is essential for achieving proper occlusion and improving overall dental health.

Methods to Correct Anterior Crossbite

  1. Acrylic Incline Plane:

    • Description: An acrylic incline plane is a removable appliance that can be used to guide the movement of the teeth. It is designed to create a ramp-like surface that encourages the maxillary incisors to move forward.
    • Mechanism: The incline plane helps to reposition the maxillary teeth by providing a surface that directs the teeth into a more favorable position during function.

  2. Reverse Stainless Steel Crown:

    • Description: A reverse stainless steel crown can be used in cases where the anterior teeth are significantly misaligned. This crown is designed to provide a stable and durable solution for correcting the crossbite.
    • Mechanism: The crown can be adjusted to help reposition the maxillary teeth, allowing them to move into a more normal relationship with the mandibular teeth.

  3. Hawley Retainer with Recurve Springs:

    • Description: A Hawley retainer is a removable orthodontic appliance that can be modified with recurve springs to correct anterior crossbite.
    • Mechanism: The recurve springs apply gentle pressure to the maxillary incisors, tipping them forward into a more favorable position relative to the mandibular teeth. This appliance is comfortable, easily retained, and predictable in its effects.

  4. Fixed Labial-Lingual Appliance:

    • Description: A fixed labial-lingual appliance is a type of orthodontic device that is bonded to the teeth and can be used to correct crossbites.
    • Mechanism: This appliance works by applying continuous forces to the maxillary teeth, tipping them forward and correcting the crossbite. It may include a vertical removable arch for ease of adjustment and recurve springs to facilitate movement.

  5. Vertical Removable Arch:

    • Description: This appliance can be used in conjunction with other devices to provide additional support and adjustment capabilities.
    • Mechanism: The vertical removable arch allows for easy modifications and adjustments, helping to jump the crossbite by repositioning the maxillary teeth.
Orthodontics Wire Slot Play
Orthodontics
Wire Size Slot Size Play (Degrees)
21.5 x 28 0.022 " 2°
21 x 25 0.022 " 4°
19 x 25 0.022 " 10°
Deciduous Teeth Spacing & Crowding Prediction
Orthodontics
Class Spacing Crowding Risk in Permanent Dentition
I Crowded 10/10
II No spaces 7/10
III 3 mm spacing 5/10
IV 3 – 6 mm spacing 2/10
V >6 mm spacing None
Nail Biting Habits
Orthodontics

Nail Biting Habits

Nail biting, also known as onychophagia, is one of the most common habits observed in children and can persist into adulthood. It is often associated with internal tension, anxiety, or stress. Understanding the etiology, clinical features, and management strategies for nail biting is essential for addressing this habit effectively.

Etiology

  1. Emotional Problems:

    • Persistent nail biting may indicate underlying emotional issues, such as anxiety, stress, or tension. It can serve as a coping mechanism for dealing with these feelings.

  2. Psychosomatic Factors:

    • Nail biting can be a psychosomatic response to stress or emotional discomfort, manifesting physically as a way to relieve tension.

  3. Successor of Thumb Sucking:

    • For some children, nail biting may develop as a successor to thumb sucking, particularly as they transition from one habit to another.

Clinical Features

  • Dental Effects:

    • Crowding: Nail biting can contribute to dental crowding, particularly if the habit leads to changes in the position of the teeth.
    • Rotation: Teeth may become rotated or misaligned due to the pressure exerted during nail biting.
    • Alteration of Incisal Edges: The incisal edges of the anterior teeth may become worn down or altered due to repeated contact with the nails.

  • Soft Tissue Changes:

    • Inflammation of Nail Bed: Chronic nail biting can lead to inflammation and infection of the nail bed, resulting in redness, swelling, and discomfort.

Management

  1. Awareness:

    • The first step in management is to make the patient aware of their nail biting habit. Understanding the habit's impact on their health and appearance can motivate change.

  2. Addressing Emotional Factors:

    • It is important to identify and treat any underlying emotional issues contributing to the habit. This may involve counseling or therapy to help the individual cope with stress and anxiety.

  3. Encouraging Outdoor Activities:

    • Engaging in outdoor activities and physical exercise can help reduce tension and provide a positive outlet for stress, potentially decreasing the urge to bite nails.

  4. Behavioral Modifications:

    • Nail Polish: Applying a bitter-tasting nail polish can deter nail biting by making the nails unpalatable.
    • Light Cotton Mittens: Wearing mittens or gloves can serve as a physical reminder to avoid nail biting and can help break the habit.

  5. Positive Reinforcement:

    • Encouraging and rewarding the individual for not biting their nails can help reinforce positive behavior and motivate them to stop.