NEET MDS Lessons
Pedodontics
Soldered Lingual Holding Arch as a Space Maintainer
Introduction
The soldered lingual holding arch is a classic bilateral mixed-dentition space maintainer used in the mandibular arch. It is designed to preserve the space for the permanent canines and premolars during the mixed dentition phase, particularly when primary molars are lost prematurely.
Design and Construction
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Components:
- Bands: Fitted to the first permanent molars.
- Wire: A 0.036- or 0.040-inch stainless steel wire is contoured to the arch.
- Extension: The wire extends forward to make contact with the cingulum area of the incisors.
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Arch Form: The wire is contoured to provide an anterior arch form, allowing for the alignment of the incisors while ensuring it does not interfere with the normal eruption paths of the teeth.
Functionality
- Stabilization: The design stabilizes the positions of the lower molars, preventing them from moving mesially and maintaining the incisor relationship to avoid retroclination.
- Leeway Space: The arch helps sustain the canine-premolar segment space, utilizing the leeway space available during the mixed dentition phase.
Clinical Considerations
- Eruption Path: The lingual wire must be contoured to avoid interference with the normal eruption paths of the permanent canines and premolars.
- Breakage and Hygiene: The soldered lingual holding arch is designed to present minimal problems with breakage and minimal oral hygiene concerns.
- Eruptive Movements: It should not interfere with the eruptive movements of the permanent teeth, allowing for natural development.
Timing of Placement
- Transitional Dentition Period: The bilateral design and use of permanent teeth as abutments allow for application during the full transitional dentition period of the buccal segments.
- Timing of Insertion: Lower lingual arches should not be placed before the eruption of the permanent incisors due to their frequent lingual eruption path. If placed too early, the lingual wire may interfere with normal incisor positioning, particularly before the lateral incisor erupts.
- Anchorage: Using primary incisors as anterior stops does not provide sufficient anchorage to prevent significant loss of arch length.
Hypnosis in Pediatric Dentistry
Hypnosis: An altered state of consciousness characterized by heightened suggestibility, focused attention, and increased responsiveness to suggestions. It is often used to facilitate behavioral and physiological changes that are beneficial for therapeutic purposes.
- Use in Pediatrics: According to Romanson (1981), hypnosis is recognized as one of the most effective nonpharmacologic therapies for children, particularly in managing anxiety and enhancing cooperation during medical and dental procedures.
- Dental Application: In the field of dentistry, hypnosis is referred to as "hypnodontics" (Richardson, 1980) and is also known as psychosomatic therapy or suggestion therapy.
Benefits of Hypnosis in Dentistry
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Anxiety Reduction:
- Hypnosis can significantly alleviate anxiety in children, making dental visits less stressful. This is particularly important for children who may have dental phobias or anxiety about procedures.
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Pain Management:
- One of the primary advantages of hypnosis is its ability to reduce the perception of pain. By using focused attention and positive suggestions, dental professionals can help minimize discomfort during procedures.
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Behavioral Modification:
- Hypnosis can encourage positive behaviors in children, such as cooperation during treatment, which can reduce the need for sedation or physical restraint.
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Enhanced Relaxation:
- The hypnotic state promotes deep relaxation, helping children feel more at ease in the dental environment.
Mechanism of Action
- Suggestibility: During hypnosis, children become more open to suggestions, allowing the dentist to guide their thoughts and feelings about the dental procedure.
- Focused Attention: The child’s attention is directed away from the dental procedure and towards calming imagery or positive thoughts, which helps reduce anxiety and discomfort.
Implementation in Pediatric Dentistry
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Preparation:
- Prior to the procedure, the dentist should explain the process of hypnosis to both the child and their parents, addressing any concerns and ensuring understanding.
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Induction:
- The dentist may use various techniques to induce a hypnotic state, such as guided imagery, progressive relaxation, or verbal suggestions.
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Suggestion Phase:
- Once the child is in a relaxed state, the dentist can provide positive suggestions related to the procedure, such as feeling calm, relaxed, and pain-free.
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Post-Hypnosis:
- After the procedure, the dentist should gradually bring the child out of the hypnotic state, reinforcing positive feelings and experiences.
1. Crown Dimensions
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Primary Anterior Teeth: The crowns of primary anterior teeth (incisors and canines) are characterized by a wider mesiodistal dimension and a shorter incisocervical height compared to their permanent counterparts. This means that primary incisors are broader from side to side and shorter from the biting edge to the gum line, giving them a more squat appearance.
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Primary Molars: The crowns of primary molars are also shorter and narrower in the mesiodistal direction at the cervical third compared to permanent molars. This results in a more constricted appearance at the base of the crown, which is important for accommodating the developing permanent teeth.
2. Root Structure
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Primary Anterior Teeth: The roots of primary anterior teeth taper more rapidly than those of permanent anterior teeth. This rapid tapering allows for a more pronounced root system that is essential for anchoring the teeth in the softer bone of children’s jaws.
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Primary Molars: In contrast, the roots of primary molars are longer and more slender than those of permanent molars. This elongation and slenderness provide stability while also allowing for the necessary space for the developing permanent teeth beneath them.
3. Enamel Characteristics
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Enamel Rod Orientation: In primary teeth, the enamel rods in the gingival third slope occlusally (toward the biting surface) rather than cervically (toward the root) as seen in permanent teeth. This unique orientation can influence the way primary teeth respond to wear and decay.
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Thickness of Enamel: The enamel on the occlusal surfaces of primary molars is of uniform thickness, measuring approximately 1 mm. In contrast, the enamel on permanent molars is thicker, averaging around 2.5 mm. This difference in thickness can affect the durability and longevity of the teeth.
4. Surface Contours
- Buccal and Lingual Surfaces: The buccal and lingual surfaces of primary molars are flatter above the crest of contour compared to permanent molars. This flatter contour can influence the way food is processed and how plaque accumulates on the teeth.
5. Root Divergence
- Primary Molars: The roots of primary molars are more divergent relative to their crown width compared to permanent molars. This divergence is crucial as it allows adequate space for the developing permanent dentition, which is essential for proper alignment and spacing in the dental arch.
6. Occlusal Features
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Occlusal Table: The occlusal table of primary molars is narrower in the faciolingual dimension. This narrower occlusal surface, combined with shallower anatomy, results in shorter cusps, less pronounced ridges, and shallower fossae. These features can affect the functional aspects of chewing and the overall occlusion.
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Mesial Cervical Ridge: Primary molars exhibit a prominent mesial cervical ridge, which serves as a distinguishing feature that helps in identifying the right and left molars during dental examinations.
7. Root Characteristics
- Root Shape and Divergence: The roots of primary molars are not only longer and more slender but also extremely narrow mesiodistally and broad lingually. This unique shape contributes to their stability while allowing for the necessary divergence and minimal curvature. Additionally, primary molars typically have little or no root trunk, which is a stark contrast to the more complex root structures of permanent molars.
Classification of Oral Habits
Oral habits can be classified based on various criteria, including their nature, impact, and the underlying motivations for the behavior. Below is a detailed classification of oral habits:
1. Based on Nature of the Habit
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Obsessive Habits (Deep Rooted):
- International or Meaningful:
- Examples: Nail biting, digit sucking, lip biting.
- Masochistic (Self-Inflicting):
- Examples: Gingival stripping (damaging the gums).
- Unintentional (Empty):
- Examples: Abnormal pillowing, chin propping.
- International or Meaningful:
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Non-Obsessive Habits (Easily Learned and Dropped):
- Functional Habits:
- Examples: Mouth breathing, tongue thrusting, bruxism (teeth grinding).
- Functional Habits:
2. Based on Impact
- Useful Habits:
- Habits that may have a positive or neutral effect on oral health.
- Harmful Habits:
- Habits that can lead to dental issues, such as malocclusion, gingival damage, or tooth wear.
3. Based on Author Classifications
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James (1923):
- a) Useful Habits
- b) Harmful Habits
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Kingsley (1958):
- a) Functional Oral Habits
- b) Muscular Habits
- c) Combined Habits
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Morris and Bohanna (1969):
- a) Pressure Habits
- b) Non-Pressure Habits
- c) Biting Habits
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Klein (1971):
- a) Empty Habits
- b) Meaningful Habits
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Finn (1987):
- I. a) Compulsive Habits
- b) Non-Compulsive Habits
- II. a) Primary Habits
4. Based on Functionality
- Functional Habits:
- Habits that serve a purpose, such as aiding in speech or feeding.
- Dysfunctional Habits:
- Habits that disrupt normal oral function or lead to negative consequences.
Stainless Steel Crowns
Stainless steel crowns (SSCs) are a common restorative option for primary teeth, particularly in pediatric dentistry. They are especially useful for teeth with extensive carious lesions or structural damage, providing durability and protection for the underlying tooth structure.
Indications for Stainless Steel Crowns
- Primary Incisors or Canines:
- SSCs are indicated for primary incisors or canines that have extensive proximal lesions, especially when the incisal portion of the tooth is involved.
- They are particularly beneficial in cases where traditional restorative materials (like amalgam or composite) may not provide adequate strength or longevity.
Crown Selection and Preparation
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Crown Selection:
- An appropriate size of stainless steel crown is selected based on the dimensions of the tooth being restored.
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Contouring:
- The crown is contoured at the cervical margin to ensure a proper fit and to minimize the risk of gingival irritation.
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Polishing:
- The crown is polished to enhance its surface finish, which can help reduce plaque accumulation and improve esthetics.
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Cementation:
- The crown is cemented into place using a suitable dental cement, ensuring a secure fit even on teeth that have undergone significant carious structure removal.
Advantages of Stainless Steel Crowns
- Retention:
- SSCs provide excellent retention and can remain in place even when extensive portions of carious tooth structure have been removed.
- Durability:
- They are highly durable and can withstand the forces of mastication, making them ideal for primary teeth that are subject to wear and tear.
Esthetic Considerations
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Esthetic Limitations:
- One of the drawbacks of stainless steel crowns is their metallic appearance, which may not meet the esthetic requirements of some children and their parents.
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Open-Face Stainless Steel Crowns:
- To address esthetic concerns, a technique known as the open-face stainless steel crown can be employed.
- In this technique, most of the labial metal of the crown is cut away, creating a labial "window."
- This window is then restored with composite resin, allowing for a more natural appearance while still providing the strength and durability of the stainless steel crown.
Erythroblastosis fetalis
Blue-green colour of primary teeth only. It is due to excessive haemolysis of
RBC. The Staining occurs due to diffusion of bilirubin and biliverdin into the
dentin
Porphyria
Purplish brown pigmentation. to light and blisters on The other features hands
and face e Hypersensitivity are are red red coloured urine, urine,
Cystic fibrosis
(Yellowish gray to dark brown. It is due to tetracycline, which is the drug of
choice in this disease
Tetracycline
Yellow or yellow-brown pigmentation in dentin and to a lesser extent in enamel
that are calcifying during the time the drug is administered. The teeth
fluoresce yellow under UV light
Wright's Classification of Child Behavior
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Hysterical/Uncontrolled
- Description: This behavior is often seen in preschool children during their first dental visit. These children may exhibit temper tantrums, crying, and an inability to control their emotions. Their reactions can be intense and overwhelming, making it challenging for dental professionals to proceed with treatment.
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Defiant/Obstinate
- Description: Children displaying defiant behavior may refuse to cooperate or follow instructions. They may argue or resist the dental team's efforts, making it difficult to conduct examinations or procedures.
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Timid/Shy
- Description: Timid or shy children may be hesitant to engage with the dental team. They might avoid eye contact, speak softly, or cling to their parents. This behavior can stem from anxiety or fear of the unfamiliar dental environment.
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Stoic
- Description: Stoic children may not outwardly express their feelings, even in uncomfortable situations. This behavior can be seen in spoiled or stubborn children, where their crying may be characterized by a "siren-like" quality. They may appear calm but are internally distressed.
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Overprotective Child
- Description: These children may exhibit clinginess or anxiety, often due to overprotective parenting. They may be overly reliant on their parents for comfort and reassurance, which can complicate the dental visit.
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Physically Abused Child
- Description: Children who have experienced physical abuse may display heightened anxiety, fear, or aggression in the dental setting. Their behavior may be unpredictable, and they may react strongly to perceived threats.
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Whining Type
- Description: Whining children may express discomfort or displeasure through persistent complaints or whining. This behavior can be a way to seek attention or express anxiety about the dental visit.
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Complaining Type
- Description: Similar to whining, complaining children vocalize their discomfort or dissatisfaction. They may frequently express concerns about the procedure or the dental environment.
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Tense Cooperative
- Description: These children are on the borderline between positive and negative behavior. They may show some willingness to cooperate but are visibly tense or anxious. Their cooperation may be conditional, and they may require additional reassurance and support.