In vitro Testing of a New System for Monitoring pH at Multiple Sites

Yankell, S L; Ram, C.; Lauks, I.

doi:10.1159/000260698

Cited by 6 publications

(5 citation statements)

References 5 publications

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“…We thus found the time required for the electrodes to respond to be less than 20 s. This corresponds to clean indwelling miniature glass electrodes which respond within 15 s [Newman et al, 1979]. New iridium oxide electrodes are reported to re spond within a few seconds [Yankell et al, 1983].…”

Section: Experiments Cmentioning

confidence: 72%

“…New iridium oxide electrodes are reported to perform with an error of the regression line slope of ±0.5 mV/pH [Yankell et al, 1983]. Again, assuming that the '± ' prefix denotes the limits of the slope, and ignoring any errors associated with the regression line intercept, this figure corresponds to a deviation of a measurement from a true pH value of 7 of no more than 0.07 pH units.…”

Section: Experiments Cmentioning

confidence: 99%

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Accuracy and Precision in vitro of Beetrode® Microelectrodes Used for Intraoral pH Measurements

Küseler

Bælum²,

Fejerskov³

et al. 1993

Caries Res

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The accuracy and precision of 12 different microelectrodes were assessed through a series of pH recordings of buffer solutions with known pH values. Some electrodes were quite accurate, yielding an average deviation of recordings from true values of about 0.05 pH units, while other electrodes yielded average deviations of up to 0.20 pH units. The precision of the electrodes also varied between electrodes. While all recordings were within 0.15 pH units from the true values for some electrodes, other electrodes showed a marked dispersion with less than 25 % of the recordings being within 0.15 pH units from true values. For some electrodes accuracy depended on true pH values, while no such dependency was noted with respect to the precision of the electrodes tested. Both accuracy and precision may be impaired when pH recordings are made on solutions with pH values outside the pH range encompassed by the calibration buffers. Our results demonstrate that the accuracy and precision of these microelectrodes cannot be considered fixed and known parameters. Electrodes should therefore be checked prior to clinical use, and electrodes with low accuracy and precision should be excluded from further use.

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Section: Experiments Cmentioning

confidence: 72%

Section: Experiments Cmentioning

confidence: 99%

Accuracy and Precision in vitro of Beetrode® Microelectrodes Used for Intraoral pH Measurements

Küseler

Bælum²,

Fejerskov³

et al. 1993

Caries Res

View full text Add to dashboard Cite

show abstract

“…In vivo measurement of plaque pH has been carried out using various devices, including the antimony electrode [Stephan, 1940], glass micro-electrodes [Charlton, 1956], the pH-sensitive FET electrode [Igarashi et al, 1981] and iridium oxide wire electrodes [Yankell et al, 1983]. All have been used as indwelling electrodes, generally for food acidogenicity research, and, with the apparent exception of the FET electrode, as touch electrodes.…”

Section: Discussionmentioning

confidence: 99%

Plaque pH and Associated Parameters in Relation to Caries

et al. 1999

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Intensified plaque acidogenicity in caries–prone subjects was reported many years ago, but emerging evidence has suggested that the relationship may not be as strong as once thought. We have now determined a range of acidogenicity variables in subjects having both caries prevalence and incidence data, and have included plaque mineral data in the analysis. pH measurements were made in 20 randomly selected subjects from a high–caries group (mean DMFS = 8.95) and 20 from a caries–free group of Beijing children aged 12 years participating in a caries prediction study. Subgroups with a 12–month DMFS increment ≥2 or = 0 were also formed from the two groups, respectively. Measurements were made with an iridium oxide electrode inserted between teeth 13/14, 23/24, 34/35 and 44/45, before and every 5 min for 30 min after rinsing with 10% sucrose, and the 4 resulting ‘Stephan curves’ averaged using a plaque pH analysis program. Supragingival plaque was collected from buccal and lingual smooth surfaces of posterior and upper anterior teeth and its acid extract analysed for Ca, P and F. Caries–free subjects (based on past experience) had a significantly higher maximum plaque pH and pH value after 30 min (reflecting a faster return to resting pH), a lower minimum enamel dissolution capacity of plaque and recorded less time below pH 7.0 than did high–caries subjects. No other differences were significant, including those of the principal acidogenic parameters ‘minimum pH attained after a sugar rinse’, ‘curve area below the critical pH of 5.5’ and ‘time below the critical pH’. Selection of the caries groups on the basis of both experience and incidence did not reveal significant differences in more parameters. Upper arch plaque was significantly more acidogenic than lower arch plaque, and there was a consistently strong association between upper and lower arch values in individuals. Ca, P and F in the subjects’ plaque had little or no influence on the principal acidogenic parameters. Our failure to find a relationship between caries prevalence or activity and these principal acidogenicity parameters may be related to differences between fissure and smooth surface plaque, temporal variations in acidogenicity and/or to use of F toothpaste during the 1–year observation period. These results support the view that factors such as the frequency of acidogenic episodes may be more important in caries progression than the degree of acidogenicity during any one episode.

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“…Pace has demonstrated that a pH sensitive element, combined with a multilayer composite structure, can be used to detect a wide range of chemical species (56). This concept is quite versatile and has been proposed as the means to extend the capability of the pH sensitive chemfet to measure a variety of important biological and medical chemical constituents (57).…”

Section: Integrated Silicon-based Electrochemical Sensorsmentioning

confidence: 99%

Recent Advances in Chemically Sensitive Electronic Devices

Zemel

Spiegel

Fare

et al. 1986

ACS Symposium Series

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Significant advances have occurred in microfabricated ion sensitive and Pd gated field effect devices and fiber optic, chemically sensitive elements. These elements are beginning to find their way into commercial development. Recent advances in these devices are discussed and compared. Pyroelectric sensor devices developed here are reviewed. A discussion of the utility of these devices is presented.An important goal f of the research presented in this volume is the development of instantaneous or near instantaneous data acquisition elements which, with the assistance of suitable control algorithms, could define a system's state in real time. The need for process control information has become even more urgent as high speed, low cost, single chip microcomputers become generally available. The development of new real time sensors based on contemporary materials and phenomena knowledge requires a more systematic approach than has been the case to date. While the need for new measurement tools to advance scientific and technological inquiry is certainly well appreciated, sensor and sensor related research is frequently viewed as "widget making" by the scientific and technological communities. By and large, the development of new sensors has been a byproduct of the normal course of materials or phenomena research. It is only in the last few years that the scientific and technological community has taken note of the fact that sensor research is becoming a distinct and important topic.

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In vitro Testing of a New System for Monitoring pH at Multiple Sites

Cited by 6 publications

References 5 publications

Accuracy and Precision in vitro of Beetrode® Microelectrodes Used for Intraoral pH Measurements

Accuracy and Precision in vitro of Beetrode® Microelectrodes Used for Intraoral pH Measurements

Plaque pH and Associated Parameters in Relation to Caries

Recent Advances in Chemically Sensitive Electronic Devices

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