Table 1 Modified united States public health service (USPHS) criteria adapted from Ryge’s criteria [20]

Anatomic form

The restoration is continuous with existing anatomic form.

The continuity of restoration with teeth partially degraded, but clinically acceptable.

The continuity of restoration with teeth completely deteriorated, need to be replaced.

Marginal adaptation

There is no visible evidence of a crevice along the margin into which the explorer will penetrate.

There is visible evidence of a crevice along the margin into which the explorer will penetrate or catch.

The explorer penetrates the crevice, and dentin or base is exposed.

Marginal discolouration

There is no discolouration anywhere on the margin between the restoration and the tooth structure.

Discolouration is present but has not penetrated along the margin in a pulpal direction.

Discolouration has penetrated along the margin in a pulpal direction.

Secondary caries

No evidence of secondary caries.

—

Evidence of secondary caries.

Colour match

The restoration matches the adjacent tooth structure in colour and translucency.

The mismatch in colour and translucency is within the acceptable range.

The mismatch in colour and translucency is outside the acceptable range.

Postoperative sensitivity

No postoperative sensitivity at any stage of the study

Slight sensitivity at any stage of the study.

Severe sensitivity at any stage of the study.

Retention

No loss of restorative material.

—

Fracture and/or loss of restorative material.