NEET MDS Lessons
Pedodontics
Major Antimicrobial Proteins of Human Whole Saliva
Human saliva contains a variety of antimicrobial proteins that play crucial roles in oral health by protecting against pathogens, aiding in digestion, and maintaining the balance of the oral microbiome. Below is a summary of the major antimicrobial proteins found in human whole saliva, their functions, and their targets.
1. Non-Immunoglobulin (Innate) Proteins
These proteins are part of the innate immune system and provide immediate defense against pathogens.
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Lysozyme
- Major Target/Function:
- Targets gram-positive bacteria and Candida.
- Functions by hydrolyzing the peptidoglycan layer of bacterial cell walls, leading to cell lysis.
- Major Target/Function:
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Lactoferrin
- Major Target/Function:
- Targets bacteria, yeasts, and viruses.
- Functions by binding iron, which inhibits bacterial growth (iron sequestration) and has direct antimicrobial activity.
- Major Target/Function:
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Salivary Peroxidase and Myeloperoxidase
- Major Target/Function:
- Targets bacteria.
- Functions in the decomposition of hydrogen peroxide (H2O2) to produce antimicrobial compounds.
- Major Target/Function:
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Histatin
- Major Target/Function:
- Targets fungi (especially Candida) and bacteria.
- Functions as an antifungal and antibacterial agent, promoting wound healing and inhibiting microbial growth.
- Major Target/Function:
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Cystatins
- Major Target/Function:
- Targets various proteases.
- Functions as protease inhibitors, helping to protect tissues from proteolytic damage and modulating inflammation.
- Major Target/Function:
2. Agglutinins
Agglutinins are glycoproteins that promote the aggregation of microorganisms, enhancing their clearance from the oral cavity.
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Parotid Saliva
- Major Target/Function:
- Functions in the agglutination/aggregation of a number of microorganisms, facilitating their removal from the oral cavity.
- Major Target/Function:
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Glycoproteins
- Major Target/Function:
- Functions similarly to agglutinins, promoting the aggregation of bacteria and other microorganisms.
- Major Target/Function:
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Mucins
- Major Target/Function:
- Functions in the inhibition of adhesion of pathogens to oral surfaces, enhancing clearance and protecting epithelial cells.
- Major Target/Function:
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β2-Microglobulin
- Major Target/Function:
- Functions in the enhancement of phagocytosis, aiding immune cells in recognizing and eliminating pathogens.
- Major Target/Function:
3. Immunoglobulins
Immunoglobulins are part of the adaptive immune system and provide specific immune responses.
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Secretory IgA
- Major Target/Function:
- Targets bacteria, viruses, and fungi.
- Functions in the inhibition of adhesion of pathogens to mucosal surfaces, preventing infection.
- Major Target/Function:
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IgG
- Major Target/Function:
- Functions similarly to IgA, providing additional protection against a wide range of pathogens.
- Major Target/Function:
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IgM
- Major Target/Function:
- Functions in the agglutination of pathogens and enhancement of phagocytosis.
- Major Target/Function:
Veau Classification of Clefts
The classification of clefts, particularly of the lip and palate, is essential for understanding the severity and implications of these congenital conditions. Veau proposed one of the most widely used classification systems for clefts of the lip and palate, which helps guide treatment and management strategies.
Classification of Clefts of the Lip
Veau classified clefts of the lip into four distinct classes:
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Class I:
- Description: A unilateral notching of the vermilion that does not extend into the lip.
- Implications: This is the least severe form and typically requires minimal intervention.
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Class II:
- Description: A unilateral notching of the vermilion border, with the cleft extending into the lip but not involving the floor of the nose.
- Implications: Surgical repair is usually necessary to restore the lip's appearance and function.
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Class III:
- Description: A unilateral clefting of the vermilion border of the lip that extends into the floor of the nose.
- Implications: This more severe form may require more complex surgical intervention to address both the lip and nasal deformity.
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Class IV:
- Description: Any bilateral clefting of the lip, which can be either incomplete notching or complete clefting.
- Implications: This is the most severe form and typically necessitates extensive surgical repair and multidisciplinary management.
Classification of Clefts of the Palate
Veau also divided palatal clefts into four classes:
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Class I:
- Description: Involves only the soft palate.
- Implications: Surgical intervention is often required to improve function and speech.
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Class II:
- Description: Involves both the soft and hard palates but does not include the alveolar process.
- Implications: Repair is necessary to restore normal anatomy and function.
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Class III:
- Description: Involves both the soft and hard palates and the alveolar process on one side of the pre-maxillary area.
- Implications: This condition may require more complex surgical management due to the involvement of the alveolar process.
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Class IV:
- Description: Involves both the soft and hard palates and continues through the alveolus on both sides of the premaxilla, leaving it free and often mobile.
- Implications: This is the most severe form of palatal clefting and typically requires extensive surgical intervention and ongoing management.
Submucous Clefts
- Definition: Veau did not include submucous clefts of the palate in his classification system.
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Diagnosis: Submucous clefts may be diagnosed through physical
findings, including:
- Bifid Uvula: A split or forked uvula.
- Palpable Notching: Notching at the posterior portion of the hard palate.
- Zona Pellucida: A thin, translucent membrane observed in the midline of the hard palate.
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Associated Conditions: Submucous clefts may be associated with:
- Incomplete velopharyngeal mechanism, which can lead to speech issues.
- Eustachian tube dysfunction, increasing the risk of otitis media and hearing problems.