Esthetics & Function: Incisal Edge Pitch

December 8, 2017 Lee Ann Brady DMD

The incisal edge anatomy of anterior teeth is quite complex. This complexity is fundamental to the esthetics of the tooth, as well as the function of incisors. How do we re-create the full anatomic form of the tooth in ceramics and composite? 

Components of Incisal Edge Anatomy Function and Esthetics: Pitch

When the full anatomic form is not precisely recreated, this can lead to esthetic and functional challenges. To successfully mimic this form, the clinician can rely on three components of incisal edges (from a lateral perspective): 1 pitch and 2 bevels.

We can visualize the pitch as the flat top of the incisal edge.

Pitch

Dimensions: Labio-lingual width of at least 1mm that increases from attrition or parafunction in edge to edge position.

Characterization: Pitch is not always parallel to the horizon and its relative position is dependent on the inclination of the incisor. Incisors are inclined just a little bit further to the labial at the incisal edge and the pitch has an upward slant toward the lingual.

Esthetics: The tooth shape and inclination results in an incisal edge esthetic of thinner enamel at the labio-incisal junction. It also creates the highly desirable visual translucence. Leveling the pitch to the horizon can change light reflection which is critical to esthetics of the tooth.

Restorative Approach: Often in ceramics we create a pitch that is level to the horizon and has decreased width of the pitch. This can compromise the esthetics of the translucency, but that can be gained back using stains.

Challenge: The challenge with this shape change in ceramics is that patients often sit in edge to edge position during parafunction. Insufficient pitch width may result in the patient experiencing functional challenges, not finding a comfortable spot to rest and increased parafunctional movement.

I’ll expand on understanding the two bevels in my next incisal edge anatomy blog …

What aspects of incisal edge anatomy do you find most challenging? Let us know in the comments!

 

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Lee Ann Brady DMD

Dr. Lee Ann Brady is passionate about dentistry, her family and making a difference. She is a general dentist and owns a practice in Glendale, AZ limited to restorative dentistry. Lee’s passion for dental education began as a CE junkie herself, pursuing lots of advanced continuing education focused on Restorative and Occlusion. In 2005, she became a full time resident faculty member for The Pankey Institute, and was promoted to Clinical Director in 2006. Lee joined Spear Education as Executive VP of Education in the fall of 2008 to teach and coordinate the educational curriculum. In June of 2011, she left Spear Education, founded leeannbrady.com and joined the dental practice she now owns as an associate. Today, she teaches at dental meetings and study clubs both nationally and internationally, continues to write for dental journals and her website, sits on the editorial board of the Journal of Cosmetic Dentistry, Inside Dentistry and DentalTown Magazines and is the Director of Education for The Pankey Institute.

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