n a process in which the normal anatomy of the restored tooth is altered by using too much restorative material. Overcontouring can destroy the natural cleaning processes present in the periodontium.
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Many operative procedures have been suggested by literature: from no additional tooth preparation to various preparations such as Chamfer, Overcontour, Internal dental groove, Bevel, Modified Bevel, Stair step chamfer.
Fracture strength of tooth fragment reattachments with postpone bevel and overcontour reconstruction.
Preservation of periodontal health depends, among other factors, on the dental preparation, which must create enough space for the restorative material, (4,8) thus preventing overcontour of the restoration.
The mean values ([micro]m) of overcontour at the positions zero, 0.
For DPT 1, when the veneers were confected without the anatomical reference tooth, statistically higher mean values of overcontour were observed at positions 1.
Evaluating variations in dental contour is an important aspect of dental research (4,12) because the presence of overcontour in restorations is an iatrogenic factor that propitiates gingival inflammation3,4,10 and dental breaking, compromising esthetically the restored element.
Aiming at eliminating the possibility of overcontour by the DPT related to lack of space for the restorative material, and also at reducing the probability of fracture of the restoration, a wear to the depth of 1 mm during tooth preparation was accurately performed to create enough space for the veneer.
Interestingly, the values of overcontour observed for DPT 3 were higher when the anatomical reference was used (Table 2).
Nevertheless, this situation was not observed in the present study since 100% of the veneers presented overcontour, even when a morphological reference was used during the sculpture of the laminate veneers.
20,21) A previous study concluded that a healthy periodontium supports overcontour or undercontour of up to 1.
If enamel structure is lost due to trauma, overcontour or chamfer is preferred.
All these parameters allowed the restoration to meet the recommended esthetic and thickness requirements for material resistance and thus avoid overcontours.