Table 5 Scoring systems of ORN

NCICTC* [31]

0

None

1

Asymptomatic and detected by imaging only

2

Symptomatic and interfering with function, but not interfering with activities of daily living

3

Symptomatic and interfering with activities of daily living

4

Symptomatic, or disabling

Store & Boysen [9]

0

Mucosal defects only

1

Radiological evidence of necrotic bone with intact mucosa

2

Positive radiological findings with denuded bone intra-orally

3

Clinically exposed radionecrotic bone, verified by imaging techniques, along with skin fistulas and infection

Glanzmann & Gratz [47]

1

Bone exposure without signs of infection and persisting for at least three months

2

Bone exposure with signs of infection or sequester and without the signs of grade 3 ± 5

3

Bone necrosis treated with mandibular resection with a satisfactory result

4

Bone necrosis with persisting problems despite mandibular resection

5

Death due to osteoradionecrosis