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Figure 9
Polarity distribution in a human tooth (for more details, see Aboulfadl & Hulliger, 2015BB2), measured by absolute phase-sensitive second-harmonic microscopy (PS-SHM) using a nonlinear optical reference crystal. (Left) An area near the surface showing mono-polar alignment of collagen fibres in cementum. Here, donor (D) groups are preferentially oriented towards the surface. (Right) An area of more distributed or bipolar alignments in cementum.

IUCrJ
Volume 4| Part 4| July 2017| Pages 360-368
ISSN: 2052-2525
https://doi.org/10.1107/S205225251700700X