If you’ve followed this website, you have seen a lot of partial coverage restorations by me. I am very conservative in my decisions on when to “cover” cusps or where to leave margins. After completing thousands of partial coverage restorations, the hard guidelines that we tend to follow don’t always seem to be of importance. There is one thing that could be agreed by most dental clinicians: tooth structure is the best material for teeth.
However, when tooth structure is compromised by recurrent caries, fracture, etc. it needs the best material for the job. In my opinion, eMax CAD is the “sweet spot” of dental materials. It has great strength, can be bonded, and has excellent esthetics.
This is a case of partial coverage (3/4 crowns, gigantic onlays) that takes out the “bad parts” and leaves the “good parts.” 🙂 While deciding on the preparation design, it is important to consider what is being bonded, and to have some resemblance of mechanical resistance and retention forms. These features are certainly not as important when luting a crown, but it should still be considered.