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ePaper created 2017-03-17, 10:24:23 | version 1.38.0
involve both clinicians and dental techni- cians with the aim of achieving a perfect anatomical, functional and esthetic inte- gration of the prosthetic restoration into the patient’s mouth. In this regard, the preparation of the tooth has always rep- resented one of the most important pro- cedures for the patient’s rehabilitation by fixed prosthesis. The modified chamfer described by Dr. Massironi consists of a preparation design with a more rounded chamfer curve compared with the traditional chamfer and longer than the rounded shoulder, in order to gain a profile that adapts well to diferent types of restorative material. This modification results in a shallow (and thus less aggressive) preparation that is less operator sensitive compared with the more traditional shapes, such as a rounded shoulder or 90° shoulder. The choice of marginal finish for full- crown prosthetic preparation is usually according to the clinician’s skill. The latter depends on what the clinician learned during his or her undergraduate education or in postgraduate courses presented by more experienced colleagues, or his or her personal expertise. For these reasons, such choice is often motivated by ease and experience criteria, though some- times it may depend on the type of restor- ative material or on the intrinsic charac- teristics of the tooth. Furthermore, abutment height, number of teeth to be splinted, adhesive cementation system and esthetic needs may afect the choice. The proposed modified chamfer design is innovative and universal, because it may be adapted to every kind of prosthetic restoration and marginal closure, includ- ing the complete marginal border, the microborder where the metal, opaque material and ceramic converge, metal- free methods and CAD/CAM technolo- gies, and shoulder structures or full feld- spathic ceramic. Its great versatility is also associated with its easy clinical use, because its particular shape makes it less sensitive to clinical ability; thus, it is less operator dependent compared with other common horizontal marginal finish designs. The main challenge nowadays is finding the right balance between a minimally invasive approach and an excellent esthet- ic result. Esthetics is a direct consequence of maintaining the tooth’s health and function. Article Esthetic and Restorative Dentistry issue 2017 — 11