Effects of Acid Etchants on Dentin

Lee, Henry L.; Orłowski, Jan; Scheidt, Gary C.; Lee, John Y.K.

doi:10.1177/00220345730520061101

Cited by 67 publications

(17 citation statements)

References 6 publications

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“…The morphologic changes observed agree with previous reports, although the studies show some diversity. Whereas Garrett et al,15 using the transmission electron microscope, found morphologic change extending to the depth of 4 µ , others have found acid effects ranging from 11 µ to 20 )xm 18,48 et a] 49 however, failed to show any acid penetration into the tubules, but did describe surface changes after 2 minutes of citric acid application. These variations probably reflect the use of different experimental models and techniques.…”

Section: Discussionmentioning

confidence: 97%

Root Dentin Morphology After Different Modes of Citric Acid and Tetracycline Hydrochloride Conditioning

Fahrenbach

Clark

et al. 1992

Journal of Periodontology

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The purpose of this study was to assess the effect of citric acid and tetracycline HCl application to dentin surfaces by a "passive dripping" or an "active burnishing" technique. Twenty dentin blocks were prepared from freshly extracted non-diseased human impacted third molars. The blocks were root planed and randomly assigned to two groups for treatment with either citric acid or tetracycline HCl. The duration of treatment was 30, 60, 120, or 240 seconds. Control blocks were treated with distilled water. After treatment the blocks were processed for observation and measurements in the scanning electron microscope (SEM). Application of either of the acid solutions resulted in removal of the smear layer. Measurements indicated a time dependent increase in the mean dentinal tubule orifice diameter ranging from 1.05 microns in control specimens to 3.18 microns after 4 minutes treatment (citric acid group). The increase in tubule diameter was significantly greater (P less than or equal to 0.01) for both citric acid treatment modalities than tetracycline HCl treatment. There was also a time dependent increase in the depth of penetration as measured by a trumpeting of the tubule profiles, and this penetration was significantly greater (P less than or equal to 0.01) after citric acid treatments. Passive or active application of the acids did not seem to have any major impact on the measurements or on the surface morphology. It was concluded that citric acid causes more extensive changes than tetracycline HCl and that the mode of application of the agent is probably not critical.

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Section: Discussionmentioning

confidence: 97%

Root Dentin Morphology After Different Modes of Citric Acid and Tetracycline Hydrochloride Conditioning

Fahrenbach

Clark

et al. 1992

Journal of Periodontology

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“…6. The dentinal tubules were unplugged (Lee et al, 1973;Berry et al, 1987), and their diameter increased, as with HCl, to about 5-10 pum. The dentin surface appeared to be covered with a precipitate that probably contained both the Si-rich layer and some reaction products of the etching reaction.…”

Section: Methodsmentioning

confidence: 94%

Adhesion to Bovine Dentin-Surface Characterization

Ruse

Smith

1991

J Dent Res

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X-ray photo-electron spectroscopy (XPS) and secondary ion mass spectrometry (SIMS) were used to characterize the dentin surface, to determine the effects of different pre-conditioning procedures on the elemental composition of the dentin surface, and to investigate the interaction between dentin and a dentin bonding agent (ScotchBond) by studying the changes in the elemental composition of dentin as a result of the interaction. Scanning electron microscopy (SEM) was used to characterize sample surface morphology, which was then correlated with surface elemental composition. The results showed that: (a) the elemental composition of the smear layer was similar to that of the underlying dentin; (b) cleaning with hydrogen-peroxide did not produce any modification in the elemental composition of the dentin surface; and (c) acid-etching led to an almost complete demineralization of the dentin, leaving behind an organic-rich surface. The results suggest that bonding systems that use acid-etching as a pre-conditioning procedure should be based on agents able to interact with the organic components of dentin, since bonding agents that rely on a chelation-to-calcium reaction are unlikely to be successful. The investigation of the interaction between the bonding agent and dentin led to a postulated adhesive-bonding reaction mechanism and suggested a partially cohesive failure in the bonding agent during fracturing of a dentin-bonding-agent-bonded assembly.

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“…Investigators applying weak acids to dentin (Lee et al 1973, Gwinnett 1973, Brannstrotn & Johnson 1974, have ieported some minor demineralization in the openings of dentinal tubules but none have found a demineralized, collagen coiitaining, surface zone. The discrepancies between these results and the results of the present study are probably related to different acid strengths.…”

Section: Discussionmentioning

confidence: 99%

Effects of citric acid on diseased root surfaces

Garrett

Crigger

Egelberg

1978

J of Periodontal Research

192

100

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The effect of topically applied citric acid on periodontally diseased root surfaces was evaluated using the scanning (SEM) and transmission (TEM) electron microscopes. Results with the SEM indicate that acid application had no effect on specimens that had not been root planed. After application to root planed surfaces, however, the acid priduced a fiber‐like surface with frequent depressions. TEM observations showed that the acid application produced a four micron wide demineralized zone, which was characterized by exposed collagen fibrils. These fibrils seemed to be continuous between the mineralized and demineralized zones of the root. It appears that the relative success of the citric acid application in periodontal reattachment procedures is realted to the fact that the acid causes exposure of collagen fibrils in the dentin matrix, thus providing a suitable nidus for splicing with new fibrils during the healing process.

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Effects of Acid Etchants on Dentin

Abstract: The ability of acid etchants to penetrate dentin was tested under simulated clinical conditions. No penetration of the dentinal tubules by acid was detected by use of two different test methods, although pronounced roughening of the treated surfaces was observed.

Cited by 67 publications

References 6 publications

Root Dentin Morphology After Different Modes of Citric Acid and Tetracycline Hydrochloride Conditioning

Root Dentin Morphology After Different Modes of Citric Acid and Tetracycline Hydrochloride Conditioning

Adhesion to Bovine Dentin-Surface Characterization

Effects of citric acid on diseased root surfaces

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