Trauma From Occlusion

Question 1

Primary vs secondary trauma from occlusion

Answer 1

Primary: injury due to excessive forces in teeth with normal support

Secondary: injury due to normal or excessive forces in teeth with reduced support

Question 2

What are the two zones in glickman’s theory of co destruction

Answer 2

Zone of irritation ie margins and interdental gingiva

Zone of co destruction which is apical to zone of irritation ie root cementum, PDL, alveolar bone

Question 3

GLickman’s theory of co destruction: Occlusal trauma on top of bacterial plaque results in what kind of bone loss

Answer 3

Angular bone loss

When you have occlusal trauma, bacteria is directed down PDL space, dento alveolar and transseptal fibres will dissolve and realign and become parallel to root surface

Angular bony defects and infrabony defects

TFO is a codestrucrive factor

Question 4

What does waerhaugs concept state about tfo 1979

Answer 4

Intrabony defect occured at teeth not affected by trauma from occlusaion but because plaque front happened to move in this direction

Question 5

How do mobile teeth respond to perio txt

Answer 5

Do not respond as well, should splint teet so that blood clot more stable, better CAL gain, good formation of junctional epithelium to reduce PPD

8 year longitudinal study 1980 fleszar et al

Question 6

TFO and success of perio txt

Answer 6

Teeth with occlusal discrepancies at baseline had significantly deeper ppds and greater mobility. Teeth with occlusal adjustments responded better to non surgical perio therapy —> reduce PPD

Harrel and Nunn 2001

Question 7

HOW DO YOU get hyalinisation of PDL

Answer 7

Ortho. At pressure zone, forces get very great, PDL cells no longer maintain vitality as bloodsupply to PDL occluded —> sterile necrosis —> hyalinisation of PDL

Hyalinisation tissue removed via resorption of alveolar bone