The Effects of Calcium Hydroxide on Dentin Permeability

Abstract

Calcium hydroxide paste was applied to human dentin in vitro to determine its effects on dentin permeability. Discs of dentin were acid-etched on both sides to permit determination of their maximum permeability. Smear layers were then applied to the enamel sides of the discs, thereby reducing dentin permeability 99%. Topical application of Ca(OH) ₂ paste to the smear layer reduced dentin permeability further, to levels 48% below that of untreated smear layers. When the Ca(OH)₂-treated smear layers were exposed to 6% citric acid for two min, dentin permeability returned to the initial acid-etched value, demonstrating that Ca(OH)₂ offers little protection to acid challenge. Treatment of acid-etched dentin with Ca(OH)₂ produced a similar reduction in dentin permeability, which was restored to normal following acid challenge. Thus, Ca(OH)₂ is effective at reducing the permeability of both the smear layer and of acid-etched dentin, in vitro.

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References

Bergenholtz, G. and Reit, C. (1980): Reactions of the Dental Pulp to Microbial Provocation of Calcium Hydroxide Treated Dentin, Scand J Dent Res 88:187-192.

Brannstrom, M. ; Isacsson, G. ; and Johnson, G. (1976): The Effects of Calcium Hydroxide and Fluorides on Human Dentine, Acta Odontol Scand 34:56-67.

Calvo, P. (1884): Treatment of Sensitive Dentine, Dental Cosmos 22:139-141.

Eidelman, E. ; Finn, S.B. ; and Koulourides, T. (1965): Re-mineralization of Carious Dentin Treated with Calcium Hydroxide, J Dent Child 32:218-225.

Garberoglio, M. and Brannstrom, M. (1976): Scanning Electron Microscopic Investigation of Human Dentinal Tubules, Arch Oral Biol 21:355-362.

Greenhill, J.D. and Pashley, D.H. (1981): The Effects of Desensitizing Agents on the Hydraulic Conductance of Human Dentin in vitro, J Dent Res 60:686-698.

Green, L.L. ; Green, M.L. ; and McFall, W.T. (1977): Calcium Hydroxide and Potassium Nitrate as Desensitizing Agents for Hypersensitive Root Surfaces , J Periodontol 48:667-672.

Jorkjend, L. and Tronstad, L. (1972): Treatment of Hypersensitive Root Surfaces by Calcium Hydroxide, Scand J Dent Res 80:264-266.

Levin, M.P. ; Yearwood, L.I. ; and Carpenter, W.N. (1973): The Desensitizing Effect of Calcium Hydroxide and Magnesium Hydroxide on Hypersensitive Dentin, Oral Surg 35:741-746.

10.

Michelich, V. ; Pashley, D.H. ; and Whitford, G.M. (1978): Dentin Permeability: A Comparison of Functional versus Anatomical Tubule Radii, J Dent Res 57:1019-1024.

11.

Mjor, I.A. (1969): Dentinets Permeabilitet, Odontol Tidskr 77 :257-276.

12.

Mjor, I.A. (1983): Reaction Patterns in Human Teeth, Boca Raton : CRC Press, Inc., pp. 118-123.

13.

Mjor, I.A. and Furseth, R. ( 1968): The Inorganic Phase of Calcium Hydroxide and Corticosteroid-covered Dentine Studied by Electron Microscopy, Arch Oral Biol 13:755-763.

14.

Pashley, D.H. (1984): The Smear Layer: Physiological Considerations , Oper Dent (Suppl 3): 13-29.

15.

Pashley, D.H. and Galloway, S.E. (1985): The Effects of Oxalate Treatment on the Smear Layer of Ground Surfaces of Human Dentine, Arch Oral Biol 30:731-737.

16.

Pashley, D.H. ; Kepler, E.E. ; Williams, E.C. ; and Okabe, A. (1983): The Effects of Acid Etching on the in vivo Permeability of Dentine in the Dog, Arch Oral Biol 28:555-559.

17.

Pashley, D.H. and Livingston, M.J. (1978): Effect of Molecular Size on Coefficients in Human Dentine, Arch Oral Biol 23 :391-395.

18.

Pashley, D.H. ; Livingston, M.J. ; Reeder, O.W. ; and Hor-Ner, J. (1978): Effects of the Degree of Tubule Occlusion on the Permeability of Human Dentine in vitro, Arch Oral Biol 23 :1127-1133.

19.

Pashley, D.H. ; Michelich, V. ; and Kehl, T. (1981): Dentin Permeability: Influence of Smear Layer Removal, J Prosthet Dent 46:531-537.

20.

Pashley, D.H. ; Nelson, R. ; and Kepler, E.E. (1982): Effects of Plasma and Salivary Constituents on Dentin Permeability, J Dent Res 61:978-981.

21.

Pashley, D.H. ; Stewart, F.P. ; and Galloway, S.E. (1984): Effects of Air-Drying in vitro on Human Dentine Permeability, Arch Oral Biol 29:379-383.

22.

Seltzer, S. and Bender, I.B. (1984): The Dental Pulp: Biologic Considerations in Dental Procedures, 3rd ed. Philadelphia, PA: J.B. Lippincott Company, pp. 289-291.

23.

Trowbridge, H. ; Edwall, L. ; and Panopoulos, P. (1982): Effect of Zinc Oxide-eugenol and Calcium Hydroxide on Intra-dental Nerve Activity, J Endodont 8:103-106.