12 Questions
What type of epithelial tissues cover the oral cavity?
Squamous epithelial tissues
Which part of the oral cavity has non-keratinised epithelium?
Cheek
Where is the submucosa not present in the oral cavity?
Hard palate
What structure in the oral cavity serves as a landmark for an inferior alveolar nerve block?
Pterygomandibular raphe
Which area in the oral cavity forms the vestibule?
Between teeth and cheeks
What is the function of keratinisation in the oral cavity?
Prevents friction and provides protection
What is the function of cementum?
Provides attachment to periodontal fibers and protects the root dentin
Which cells are responsible for the formation and maintenance of cementum?
Cementoblasts and cementocytes
What is the relationship between cementum and enamel at the cemento-enamel junction (CEJ)?
The relationship can vary between overlap, meeting, or a small gap
What is the characteristic of the alveolar bone that lines the tooth socket?
Bundle bone or lamina dura
Which layer of the oral mucosa is keratinized?
Stratum corneum
What is the difference between ortho-keratinized and para-keratinized tissues?
Ortho-keratinized tissues do not have nuclei, while para-keratinized tissues do
Study Notes
Tooth Structure
- Enamel is derived from the enamel organ
- Dentine is derived from the dental papilla
- Cementum is derived from the dental follicle
- Periodontal ligament is derived from the dental follicle
- Alveolar bone is derived from the dental follicle
- Gomphosis is the type of joint that holds the tooth in place
Cementum
- Derived from dental follicle
- Mineralized, calcified tissue
- Composed of 50-55% organic fibrous (proteins) and 40-50% inorganic (minerals) components
- Acellular (no cells) in the coronal area and cellular (has cells) in the apical area
- Provides attachment to periodontal fibers
- Covers and protects the root dentin, sealing the opening of dentinal tubules
- Cells in cementum: cementocytes (inside), cementoblasts (outside, produces cementum), and cementoclasts (clears cementum)
Cementum Thickness
- Thickest at the apex of the tooth or inter-radicular areas (molars)
- Thinnest in the coronal area
CEJ (Cemento-Enamel Junction)
- Can be seen in three forms: cementum overlaps enamel (60% of people), cementum just meets enamel (30% of people), and small gap between cementum and enamel (10% of people, sensitive dentine)
Ageing of Cementum
- Continuous deposition of cementum occurs
- Cementum resorption and root dentin resorption can occur
Periodontium
- Consists of gingiva, cementum, periodontal ligament, and alveolar bone
- Supports the tooth
Alveolar Bone
- Outer cortical plates (hard bone)
- Central spongiosa (spongy bone, cancellous, or trabecular bone)
- Lining the alveolus is bundle bone or lamina dura or alveolar bone proper
Oral Mucosa
- Overlying oral epithelium
- Underlying connective tissue (lamina propria and submucosa)
- Structure similar to skin, with epidermis and dermis layers
Epithelium
- Stratum corneum (keratinized cell)
- Stratum granulosum (granular cell)
- Stratum spinosum (prickle cell)
- Stratum basale (basal cell)
- Ortho-keratinized (has keratin, no nucleus), para-keratinized (has keratin, has nucleus), and non-keratinized (no keratin, has nucleus)
Oral Cavity
- Soft tissues: squamous epithelial tissues (non-keratinized)
- Keratinized areas: hard palate and attached gingiva
- Non-keratinized areas: tongue, cheek, and soft palate
Mucosa and Submucosa
- Mucosa consists of epithelium and supporting loose connective tissue (lamina propria)
- Submucosa consists of deeper connective tissue that supports the mucosa
- Two areas without submucosa: hard palate and attached gingiva
Test your knowledge on the structures of the oral cavity soft tissues, including the types of epithelial tissues that cover the oral cavity and the composition of soft and hard tissues. Learn about keratinised and non-keratinised tissues found in different parts of the oral cavity.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
