Back to Basics
I was working on a tissue management CE course last week and it triggered me to share a few thoughts. Certainly, tissue management is one of the most important subjects in operative dentistry. In my early days at school, I loved full mouth reconstruction. This caused me to become engaged in the research of better ways to achieve predictable tissue management. I realized then that poor impressions can lead to ill-fitting crown margins and that this ultimately leads to crowns and bridges prematurely failing. In contemporary adhesive dentistry, there are even times where we need to prepare and seal/bond margins subgingivally. Even when taking extra care, some soft tissue might be cut. Historically, we've used chemical mechanical packs against the cut tissues to move them away from the margins and to stop bleeding at the same time. I discovered that trying to do both of these simultaneously can be challenging and unpredictable. I began studying the problem in 1973 when I was a young dental student at Loma Linda. I later studied the status quo of impressions in commercial labs and came to realize the vast majority of the impressions did not show all of the margin. When our crowns etc don't fit, it is most always the fault of our incomplete impressions, not the fault of laboratory technicians.
A specific case comes to mind where a patient with a Class III skeletal deformity received surgical correction. The surgeon chose to remove the lower first molars and close the space surgically. Prior to this, two different dentists had placed crowns on the two lower molars. The same technician had made the crowns for the molar crown albeit placed a couple of years apart. I still have pictures of the two extracted teeth with the crowns in place. One crown is significantly shy of the margin, while the other fits nicely. The same technician constructed both crowns. How do we know this? The patient is/was sister to the technician. I was once again reminded of the critical need to adequately displace tissue and to obtain quality hemostasis prior to impression making. Quality tissue management, be it the direct or the indirect procedure, is paramount!
Thank you,
Dan
