2, 7Ĭorrect placement of LTLAs is essential to achieve a natural result however, the reproduction technique remains challenging. 5, 6 Improper reproduction of the lines results in the restoration appearing different, even if it is identical in size to the contralateral tooth. Restorative studies have identified LTLAs as the primary anatomy for restorations, and their recreation has been emphasized for wax-up and prosthesis design. 3, 4 The interaction of LTLAs with adjacent teeth optimizes the appearance of the smile. 2, 3 The closer or further the lines are to the tooth’s center, the narrower or wider the tooth appears.
1, 2, 3 When light strikes, the area between the LTLAs directly reflects it back, giving the tooth’s perceived length and width, while the area outside the LTLAs deflects the light and is less noticeable (illusion phenomenon). 1 Labial transitional line angles (LTLAs) delimit the labial surface of the tooth and significantly influence the visual perception of the teeth and smile. Transitional line angles (or line angles), known as the contour height of marginal ridges, mark the transition from the labial (buccal) and lingual surface to the proximal surface.
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