For amalgam and and resin based restoration material

Tunnel canal preparation

*Presentation prepared by: Allan Magid Hassan

In an effort to be conservative of tooth structure removal, other investigators advocate a tunnel tooth preparation.

This preparation joins an occlusal lesion with a proximal lesion by means of a prepared tunnel under the involved marginal ridge.

In this way, the marginal ridge remains essentially intact.

Amalgam Tunnel Tooth Preparations

The tunnel preparation, as described earlier, also has been advocated for composite restorations. Usually, it also is advocated to use an RMGIC liner under the composite, and some investigators suggest that this preparation design be partially or completely restored with a GIC restorative material.

Composite Tunnel Tooth Preparations

Tunnel preparation and restoration with a glass ionomer cement (GIC) is possible due to the chemical adhesion of the cement,

The transference of fluoride ions. Since the material allows the flow of moisture, the dehydration of the cusps is reduced, making them less vulnerable to future fracture. If there is any likelihood of occlusal load more than glass ionomer can withstand, then reduce the cement to DE junction and laminate with composite resin

use of tunnel preparation can be considered when proximal carious lesion necessitate restoration

preparation should be avoided in :1. large carious lesion are diagnosed , when

access is particularly difficult.2. overlying marginal ridge is subjected to heavy

occlusion or demonstrates a crack.

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