Directa’s contact finder Spotit is a coloured marker available on straight and angled handle. As the marker traverses the contact between the prosthetic element and the adjacent tooth it leaves a clear and accurate indication of the adjustment needed for a perfect contact point. The whole operation can be performed without assistance - holding the crown with one hand and the marker with the other hand.
The coloured thread mounted on Spot it is too thick!
The thickness of the thread is unimportant. Spotit is not used to check the contact point but to check where to adjust a crown or bridge to achieve a good contact point. Spotit is used before your get a crown or bridge in place. Hold it firmly o supposed place, but do not force it into place. Let Spotit pass. Spotit will indicate where the correction shall be done so the crown or bridge will fit perfectly in place.