An Evaluation of the Effect of Non-Setting Calcium Hydroxide
on Human Dentine: A pilot Study

W. A. Twati*, D. J. Wood*, T. W. Liskiewicz**, N. S. Willmott*, M. S. Duggal*

ABSTRACT

AIM: To evaluate the effect of non-setting calcium hydroxide (NSCH) on the hardness and elastic modulus of dentine from extracted permanent premolar human teeth. METHODS: 30 freshly extracted single rooted human premolar teeth were decoronated and the roots then sectioned longitudinally into equal halves. In the experimental group a thin layer of NSCH was applied whilst the control group had no medicament. After 1, 3 and 6 months, nanoindentation was used to assess dentine hardness and the modulus of elasticity. Scanning Electron Microscopy (SEM) was used to visualize the depth of penetration of NSCH into the dentinal tubules. RESULTS: SEM images showed that there were no structural changes in the dentine slabs that had NSCH application after 1, 3 or even 6 months. However, penetration of NSCH into the dentine tubules was seen at both 3 and 6 months with a significant reduction in the hardness of dentine observed at 3 (p<0.02) and 6 months (p<0.01). The modulus of elasticity was significantly lower (p<0.01) at 6 months. CONCLUSION:It appears that there is a significant reduction in the hardness of dentine with increasing periods of calcium hydroxide application. Prolonged application of NSCH could have a detrimental effect on dentine, making the dentine more prone to fracture.

Key words: non-setting calcium hydroxide, dentine

Eur Archs Paediatr Dent 2009;10(2):104-109.

*Dept. Paediatric Dentistry, Leeds Dental Institute,
**School of Mechanical Engineering. University of Leeds, Leeds, England.

Postal address: Dr.W.Twati. Dept. Paediatric Dentistry, Leeds Dental Institute, Clarendon Way, Leeds, LS2 9LU England.
Email: den4wat@yahoo.co.uk