Questions and Answers
What does DBA stand for?
Denture bearing area
What is meant by Modiolus?
Intersection of facial muscles
What is the definition of Palatine fovea?
What are Hamular notches?
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What is the Vibrating line?
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What is the Mylohyoid ridge?
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Is the hamular notch found on the upper or lower arch?
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What is a Retromolar pad?
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What are Frena?
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What are common areas of error for recording the DBA in the upper jaw? (Select all that apply)
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What is the Post dam area?
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What are common areas of error for recording the DBA in the lower jaw? (Select all that apply)
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What are alveolar bone age changes?
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What are Haversian systems?
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What local factors influence alveolar bone resorption?
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What is the Howell & Cawood classification of alveolar ridges - Class 1?
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What is the Howell & Cawood classification of alveolar ridges - Class 2?
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What is the Howell & Cawood classification of alveolar ridges - Class 3?
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What is the Howell & Cawood classification of alveolar ridges - Class 4?
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What is the Howell & Cawood classification of alveolar ridges - Class 5?
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What is the Howell & Cawood classification of alveolar ridges - Class 6?
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What are some consequences of alveolar bone resorption?
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How much faster does the mandible resorb than the maxilla?
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What can increase alveolar bone resorption?
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Study Notes
Dental Bearing Area (DBA)
- DBA refers to the denture bearing area, crucial in prosthodontics for stability and retention of dentures.
Anatomical Landmarks
- Modiolus: The intersection point of several facial muscles, important for facial expressions and denture fit.
- Palatine fovea: Not specified, but generally associated with the posterior palate's landmarks for impressions and prosthetic design.
- Hamular notches: Found on the upper arch; these notches are located at the distal end of the hard palate, influencing denture stabilization.
- Vibrating line: A key anatomical landmark identifying the transition between the movable and immovable parts of the soft palate.
- Mylohyoid ridge: An anatomical feature on the mandible that serves as a reference for denture extensions.
Common Recording Errors
- Errors in the upper jaw DBA can occur in areas such as:
- Post dam area
- Hamular notches
- Fraenum
- Due to over-extension or under-extension.
- Lower jaw recording errors include:
- Retromolar areas
- Disto-lingual extensions
- Mylohyoid ridge
- Overextension or underextension
- Lack of harmony with oral musculature.
Alveolar Bone Age Changes
- Age-related declines in alveolar bone include:
- General bone mass decline.
- Increased resorption of cortical bone, particularly in females.
- Incomplete maturation of Haversian systems.
- Enhanced osteoclast activity subperiosteally.
- Reduced levels of vitamin D3.
Haversian Systems
- These systems found in compact bone are made up of concentric circles known as lamellae, vital for bone strength and structure.
Factors Influencing Alveolar Bone Resorption
- Local factors affecting resorption include:
- Timing and pattern of teeth extractions.
- Bone structure at the extraction time.
- Trauma associated with the extraction process.
- Parafunctional habits, such as bruxism.
- Health of oral tissues and general pathology.
- Miscellaneous factors that may apply.
Howell & Cawood Classification of Alveolar Ridges
- Class 1: Dentate (natural teeth present).
- Class 2: Recent extraction (freshly edentulous).
- Class 3: Well-formed (adequate bone structure).
- Class 4: Knife-edged (very thin ridge).
- Class 5: Atrophied (significantly reduced bone mass).
- Class 6: 'Negative' (deformities present).
Consequences of Alveolar Bone Resorption
- Resorption leads to:
- Reduced denture-bearing area.
- Decreased volume and strength of residual bone.
- Loss of fabio-buccal vestibule.
- Compromised lip support.
- More pronounced muscle attachments.
- Increased inter-arch distance.
- Pseudo class III appearance of the mandible.
- Degenerative changes in the arterial supply of the mandible.
- More superficial positioning of the inferior alveolar nerve bundle.
Comparative Resorption Rates
- The mandible resorbs four times faster than the maxilla, emphasizing the importance of monitoring and managing mandibular resorption in prosthetic dentistry.
Factors Increasing Alveolar Bone Resorption
- High loading conditions, particularly from parafunctional habits or poor denture construction, can exacerbate alveolar bone resorption.
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Description
Explore key terms related to the dental bearing area and its structural elements. This quiz focuses on various anatomical features relevant to denture construction and jaw changes due to age. Test your knowledge of vocabulary essential for dental professionals.
