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Questions and Answers
What effect does the loss of teeth have on the nasolabial sulcus?
What effect does the loss of teeth have on the nasolabial sulcus?
- It becomes deeper. (correct)
- It remains unchanged.
- It completely disappears.
- It becomes shallower.
What shape does the philtrum take in the absence of teeth?
What shape does the philtrum take in the absence of teeth?
- Flat (correct)
- Circular
- Triangle
- Diamond
Which term describes the depression between the lower lip and the chin?
Which term describes the depression between the lower lip and the chin?
- Mentolabial sulcus (correct)
- Philtrum
- Nasolabial sulcus
- Vermillion border
What angle is formed by the mentolabial sulcus in Angle Class II relationships?
What angle is formed by the mentolabial sulcus in Angle Class II relationships?
Which anatomical landmark shows a gentle curvature in Angle Class I relationships?
Which anatomical landmark shows a gentle curvature in Angle Class I relationships?
What is the role of the modiolus in the context of facial anatomy?
What is the role of the modiolus in the context of facial anatomy?
What anatomical feature is referred to as the transitional epithelium between the lip and skin?
What anatomical feature is referred to as the transitional epithelium between the lip and skin?
What type of angle does the mentolabial sulcus form in Angle Class III relationships?
What type of angle does the mentolabial sulcus form in Angle Class III relationships?
What is the primary function of the incisive papilla?
What is the primary function of the incisive papilla?
Which structure is considered a primary stress-bearing area in the maxilla?
Which structure is considered a primary stress-bearing area in the maxilla?
What occurs due to a prolonged edentulous state?
What occurs due to a prolonged edentulous state?
How should the median palatine raphe be treated when constructing dentures?
How should the median palatine raphe be treated when constructing dentures?
What is the primary concern regarding the torus palatinus during denture construction?
What is the primary concern regarding the torus palatinus during denture construction?
What anatomical change occurs with excessive resorption in the maxilla?
What anatomical change occurs with excessive resorption in the maxilla?
Which of the following is a key characteristic of the residual alveolar ridge?
Which of the following is a key characteristic of the residual alveolar ridge?
What effect do the palatine rugae have on speech?
What effect do the palatine rugae have on speech?
What is the primary purpose of the posterior palatal seal in a maxillary denture?
What is the primary purpose of the posterior palatal seal in a maxillary denture?
Which feature of the posterior palatal seal helps to eliminate the gag reflex?
Which feature of the posterior palatal seal helps to eliminate the gag reflex?
What is post-damming in the context of denture design?
What is post-damming in the context of denture design?
What role does the pterygo-maxillary notch play in denture design?
What role does the pterygo-maxillary notch play in denture design?
For an effective posterior palatal seal, what key characteristic must the denture have?
For an effective posterior palatal seal, what key characteristic must the denture have?
What is the importance of relieving the labial frenum in denture construction?
What is the importance of relieving the labial frenum in denture construction?
Where should the posterior border of the upper denture be positioned in relation to the fovea Palatina?
Where should the posterior border of the upper denture be positioned in relation to the fovea Palatina?
Which muscle fiber contraction does not displace the denture due to its horizontal orientation?
Which muscle fiber contraction does not displace the denture due to its horizontal orientation?
What is the significance of the soft palate in relation to the upper denture?
What is the significance of the soft palate in relation to the upper denture?
Which structure must be relieved in denture fabrication to avoid functional complications?
Which structure must be relieved in denture fabrication to avoid functional complications?
What is the vibrating line associated with in the context of the soft palate?
What is the vibrating line associated with in the context of the soft palate?
Which classification of the soft palate curvature provides a broad posterior palatal seal area?
Which classification of the soft palate curvature provides a broad posterior palatal seal area?
What is the anatomical significance of the buccal vestibule in denture construction?
What is the anatomical significance of the buccal vestibule in denture construction?
Study Notes
Anatomy of the Edentulous Ridges
- The edentulous ridges are the supporting structures for complete dentures.
- Extraoral landmarks:
- Interpupillary line: a line connecting the centers of the pupils
- Ala-Tragus line: a line connecting the ala of the nose to the tragus of the ear
- Nasolabial sulcus: a depression extending from the side of the nose downwards and backwards
- Modiolus: a muscular point located at the angle of the mouth
- Philtrum: a diamond-shaped area at the center of the upper lip
- Vermillion border: the transitional epithelium between the mucous membrane of the lip and the skin
- Angle of the mouth: the point where the upper and lower lips meet
- Mentolabial sulcus: a depression that runs horizontally between the lower lip and the chin
- Intraoral landmarks:
- Maxillary supporting structures:
- Residual alveolar ridge: usually broad, rounded and covered with dense fibrous connective tissue
- Maxillary tuberosity: the most posterior part of the alveolar ridge, distal to the last molar, considered a primary stress-bearing area
- Incisive papilla: a pear-shaped elevation of soft tissue at the midline, just palatal to the upper centrals, covering the incisive foramen
- Median Palatine Raphe: the midline of the hard palate, covered by a thin layer of mucoperiostium
- Palatine Rugae: irregular shaped elevation of ridges of dense connective tissue extending laterally from the midline in the anterior one third of the hard palate
- Torus Palatinus: bony exostosis sometimes present in the middle of the palate, must be relieved or surgically excised if large
- Fovea Palatina: two small pits or depressions found on the sides of the midline, corresponding to the opening of the ducts of minor salivary glands
- Root of Zygoma: formed by the lower portion of the zygomatic process of the maxilla, provides resistance to vertical forces
- Maxillary limiting structures:
- Labial Frenum: a fold of mucous membrane attaching the upper lip to the alveolar ridge
- Labial vestibule: a reflection of the mucosa of the upper lip to the mucosa of the alveolar process
- Buccal frenum: a fold of mucous membrane varying in size and number, containing muscle fibers of levator anguli oris
- Buccal vestibule: a reflection of the mucous membrane from the cheek to the alveolar ridge distal to the buccal frenum
- Soft Palate: divided into an immovable (adjacent to the hard palate) and movable part (more posterior), their junction is called the vibrating line (AH line)
- Posterior Palatal Seal: a slight compression applied by the denture over the resilient soft tissues at the vibrating line to aid in retention
- Post-damming: elevation at the posterior border of the maxillary denture to prevent air passage, food ingress, improve retention, and compensate for polymerization shrinkage
- Maxillary supporting structures:
Changes After Tooth Loss:
- Resorption of alveolar supporting bone: this leads to changes in the shape and size of the edentulous ridge
- Lack of support of the facial muscles: this can lead to a change in the position of the lips and chin
- Chin-nose approximation: due to the loss of vertical dimension, the chin and nose may appear closer together
- *Angular Cheilitis: inflammation at the angle of the mouth, can be caused by prolonged edentulous state due to dripping saliva
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Description
This quiz covers the anatomical features of edentulous ridges crucial for effective denture support. It examines both extraoral and intraoral landmarks, including key definitions and their significance in dentistry. Test your knowledge on these important concepts!
