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My topic of today's presentation is revisiting treatment strategies for periodontally compromised teeth in the aesthetic zone, which is a very challenging situation. I think everybody has a concern in daily practice. So first of all, when it comes to thinking about intraoral aesthetic treatment planning, there is a fundamental objective to be taken into consideration. It sounds like a lot, but quite basic stuff, and then besides those elements, intraorally, we have to think about how to evaluate the smile and the face frame outside of the intraoral element. So in terms of the patient's replant smile we care about how much gingiva displays the patient exports. According to a classic smile classification by Dr. Miller there are three types of replant smiles. First thing is a low replant smile, the patient doesn't expose any gingiva display at the smile. Adelaide's Repline SMI, the patient exposed soft tissue, interdental space only. Highly plant SMI, the patient displays all margins of soft tissue. So that classification was quite famous a long time ago, but classification is only a classification. Sometimes it's not practical to elaborate on the actual treatment plan, especially the high plan because it varies a lot. So some patients show more and some patients show less. That's why it's kind of difficult and sometimes we need to modify this like a smile classification. 
- Excerpt from the beginning of the lecture.