Shortened dental arch

Question 1

what are problems with RPD?

Answer 1

• root caries because of bad OH
• periodontal disease

Question 2

what is the SDA concept?

Answer 2

• A dentition where most posterior teeth are missing
• Satisfactory oral function without use of RPD
• Priority given to maintaining an anterior and premolar dentition in one or both jaws
• In the right circumstances, non-replacement of posterior missing teeth can provide a stable and acceptable dentition
• Sufficient adaptive capacity in subjects when 3 to 5 occlusal units are left:
• a pair of occluding premolars = 1 unit
• a pair of occluding molars = 2 units

Question 3

what is the most ideal one here slide 6 picture?

Question 4

what is criticism of SDA concept?

Answer 4

Loss of molars associated with:
- reduced masticatory efficiency
- mandibular displacement
- alterations in food selection
- aesthetic issues
- loss of occlusal stability
- TMJ problems

Question 5

what are some conclusions of SDA (3-5 OU)

Answer 5

• SDAs provide sufficient oral function and oral comfort in terms of chewing function, aesthetics, and signs and symptoms of TMD
• SDAs provide sufficient mandibular stability: the absence of molar support is not a risk factor for the development of TMD problems.
• SDAs provide sufficient occlusal stability: minor changes in interdental spacing occur shortly after extractions leading to an SDA, but a new occlusal equilibrium remains stable and these changes do not pose any problem to the oral function. Vertical overbite is not influenced by the SDA.
• Occlusal attrition in SDAs does not differ significantly from that of complete dental arches.
• Alveolar bone height scores in SDAs tend to decrease at the same degree as in complete dental arches.