SDA

Question 1

What is the SDA concept?

Answer 1

A dentition where most posterior teeth are missing with satisfactory oral function without the use of RPD

Question 1

What is problem associated with RPD?

Answer 1

high incidence of dental disease such as root caries and periodontal disease

Question 2

Priority is given to which teeth in SDA?

Answer 2

• anterior and premolar teeth

Question 3

How many units in a pair of occluding premolars?

Answer 3

1 Unit

Question 4

How many units in a pair occluding molars?

Answer 4

2 units

Question 5

What 5 criticisms on SDA?

Answer 5

• Reduced masticatory efficiency
• Mandibular displacement
• Aesthetics
• TMJ problems
• Alteration in food selection

Question 6

5 indications of SDA?

Answer 6

• Missing posterior teeth with 3-5 occlusal units remaning
• Sufficient occlusal contacts
• Good prognosis of remaining anteriors and premolars
• Patient does not want complicated treatment
• Limited financial resources

Question 7

5 contraindications of SDA?

Answer 7

• Poor prognosis of remaining teeth
• Periodontal disease
• TMJ dysfunction
• Signs of toothwear
• Severe Class II or III malocclusion

Question 8

2 extraoral examination to carry out for SDA?

Answer 8

• TMJ dysfunction - MoM hypertrophy or TMJ pain or sounds
• Skeletal relationship

Question 9

4 intraoral examinations to carry out for SDA?

Answer 9

• check for bruxism
• Signs of toothwear
• Periodontal assessment
• Check teeth of poor prognosis

Question 10

What is associated with SDA with poor periodontal support?

Answer 10

• Drifting of teeth and distal tooth migration
• Loss of alveolar bone compromising future denture bearing area
• Loss of space (neutral zone)

Question 11

What are the 5 factors of occlusal stability?

Answer 11

• Absence of pathology
• Periodontal support
• Number of teeth in the dental arches
• Interdental spacing
• Occlusal contacts
• Mandibular stability

Question 12

5 requirements of occlusal stability?

Answer 12

• Stable contacts in all teeth of equal intensity in ICP
• Anterior guidance in harmony with envelope function
• Disclusion of all posterior teeth during mandibular protrusive movement
• Disclusion of all posterior teeth on the non working side during mandibular lateral movement
• Disclusion of all posterior teeth on the working side during mandibular lateral movement

Question 13

4 manifestations of a traumatic occlusion?

Answer 13

• Tooth mobility
• Fracture or restorations and teeth
• Dental pain
• Tooth wear

Question 14

4 ways you can extend SDA?

Answer 14

• Conventional or adhesive bridgework max on unit on each side on each arch
• Implants
• RPD