The University of Tennessee Research

The Dental School at the University of Tennessee conducted two separate researches.  One was to to check the use of the c- shape instrument for sealant application.  The second was to check its use as a composite instrument.

First Study

The sealants were placed using the traditional way with a combination of brushes and explorers. It was noted that when scanned under microscope, the sealant was bulky and more prone to fracture under function.  This gives a false sense of a successful procedure and actually puts the child more prone to cavities when the sealant fails without perception of failure.

When the C-shape sealants were evaluated, these things were noted: a very small amount of sealant was needed to do the procedure, the sealant material was pushed into the grooves perfectly to where it could only be felt with an explorer but not seen with the naked eye, under the microscope the sealant was perfectly placed, when tested for leakage the sealant was more than twice as strong with the C-shape.

These results were presented and shared at the IADR (International Association of Dental Research) meeting in Orlando, FL by the research team from UT Dental School.

Second Study

This study focused on the use of the C-Shape as a composite instrument.  The technique that the C-Shape employs is a compression technique where the composite is pressed into the cavity under pressure so that there is maximum interface between the filling material and the cavity surface.  The following benefits were noted: a better seal of filling, no gaps, no voids, teeth were studied under simulated intra oral conditions and the filling placed with traditional instruments showed high level of leakage whereas the C-Shape fillings showed little or no leakage at all.

These results also are planned to be presented at the IADR 2019 in Vancouver Canada.


Pre OP

Post OP

Post Op

Pre Op

Radiographic Evaluation

In this comparison between a filling that was done with the traditional technique (as seen in the pre-op x-ray) and the filling that was done using C-Shape system (as seen in the post-op x-ray), we can see that the filling that was performed using the C-Shape system appears denser in the radiograph. We can tell that because the shadow is more radiopaque. This filling, then, is more emotionally stable and stronger in the body. This makes it a stronger restoration for the patient. The filling was also placed using the bulk-fill technique, and the patient handled the treatment well, having no post-op systems.


The University of Tennessee College of Dentistry – Bioscience research study was intended to evaluate how well using the C-Shape system would benefit the final result when compared to traditional instruments and the manufacturer’s instructions.


After the filling materials were placed in extracted teeth using the traditional instrument and also using the C-Shape system, teeth were put in a thermocycler for 500 rounds and 5000 rounds in two separate evaluations. After this, the teeth were sectioned. Beneath the SEM, the adaptation and seal were then evaluated.


The study showed smooth marginal adaption. The seal achieved with the C-Shape was super and material penetrated the entire preparation.

C-Shape instruments provide exceptional marginal adaptation and solid filling body. It had superior durability and the procedure time was muss less.

As the study shows, the C-Shape instrument can be very beneficial and has many advantages. It’s something worth considering, especially considering that the investment is minor and the advantages are many.

There are more uses than simply building a restoration; it can also be used to place sealants! Check it out now. You won’t regret it.