EPIX: an interactive computer application program for cross-sectional epidemiological, periodontal investigations from X-ray films

Wouters, Francis R.

doi:10.1016/0169-2607(88)90043-0

Cited by 7 publications

(9 citation statements)

References 4 publications

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“…The study was thus designed in accordance with statistically accepted principles and the presentation of the results fulfills recommendations for the presentation of periodontal disease data in epidemiological research , Okamoto et al 1988). Furthermore, the computerized system (Wouters et al 1988a) which was utilized for measurement of the interproximal alveolar bone levels from radiographs has been thorougly tested and has been shown to be precise and reliable for cross-sectional epidemiologic investigations (Wouters 1988, Wouters et al 1988b).…”

Section: Discussionmentioning

confidence: 99%

“…The reference points were registered as coordinate pairs from x 5-magnified radiographs using the personal computer/digitizer system described by Wouters et al (1988a) and the computer application program EPIX (Wouters 1988). The recordings were performed by the same examiner (FRW) on each interproximal tooth surface unit of the permanent teeth, except the 3rd molars.…”

Section: Number Of Remaining Teeth (Table 2)mentioning

confidence: 99%

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Marginal alveolar bone height in an adult Swedish population

Frithiof

Wouters

et al. 1991

J Clinic Periodontology

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The purpose of the present cross-sectional epidemiologic study was to assess the interproximal alveolar bone level within the dentition of 732 randomly selected adult individuals, stratified according to gender and age. Full mouth series of periapical radiographs were used for the assessments of the relation alveolar bone height/root length (B/R). A computer/digitizer recording method was utilized for the assessments. The results were presented as (i) mean values per age group and gender, (ii) mean frequency of subjects with sites exceeding certain thresholds of bone loss and (iii) cumulative frequencies of subjects with various number and percentual proportion of sites in relation to different B/R-ratio intervals. The results showed a reduction in mean alveolar bone/root ratio with age. The women had a significantly more favourable mean B/R-ratio than men in the ages above 40 years; the women had, however, more missing sites above age 60 years. By older age, there was observed an increased variation between individual mean B/R-ratios. Only a few subjects had a mean B/R-ratio less than or equal to 50%. A subfraction of the subjects in the different age groups had greater than 20% of their sites below a B/R-ratio of 60%. This fraction increased with age.

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Section: Discussionmentioning

confidence: 99%

Section: Number Of Remaining Teeth (Table 2)mentioning

confidence: 99%

Marginal alveolar bone height in an adult Swedish population

Frithiof

Wouters

et al. 1991

J Clinic Periodontology

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“…This study was designed as a cross-sectional epidemiological investigation [17–19]. The survey included items related to the participants' general information and medical history, the Information Collection Table of PMDD TCM Symptoms, information for TCM syndrome differentiation (based on expert experience), and a daily record of the severity of problems (DRSP).…”

Section: Methodsmentioning

confidence: 99%

Epidemiological Distribution and Subtype Analysis of Premenstrual Dysphoric Disorder Syndromes and Symptoms Based on TCM Theories

Qiao

Sun

Wang

et al. 2017

BioMed Research International

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We performed an epidemiological investigation of subjects with premenstrual dysphoric disorder (PMDD) to identify the clinical distribution of the major syndromes and symptoms. The pathogenesis of PMDD mainly involves the dysfunction of liver conveyance and dispersion. Excessive liver conveyance and dispersion are associated with liver-qi invasion syndrome, while insufficient liver conveyance and dispersion are expressed as liver-qi depression syndrome. Additionally, a nonconditional logistic regression was performed to analyze the symptomatic features of liver-qi invasion and liver-qi depression. As a result of this analysis, two subtypes of PMDD are proposed, namely, excessive liver conveyance and dispersion (liver-qi invasion syndrome) and insufficient liver conveyance and dispersion (liver-qi depression syndrome). Our findings provide an epidemiological foundation for the clinical diagnosis and treatment of PMDD based on the identification of different types.

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“…These distances are expected to cover approximately the range of distances measured to determine interproximal alveolar bone levels from periapical radiographs. The equation expressing the linear relationship between measurement accuracy and scale distance is easily integrated in a computer application program to calibrate each measurement (26). This calibration should be done with regard to the systematics of the variation, even though the variation in accuracy reported is much smaller than that due to location of landmarks on the radiographs (23)(24)(25)291.…”

Section: Component Evaluationmentioning

confidence: 99%

“…The magnification between where lAB is the distance between two points, A and B, of coordinates (xA,YA) and (xB,yB), respectively. The software was developed by one of the authors (F. R. Wouters) (26).…”

Section: Measuring Systemmentioning

confidence: 99%

A computerized system to measure interproximal alveolar bone levels in epidemiologic, radiographic investigations: I. Methodologic study

Wouters¹,

Jon-And²,

Frithiof³

et al. 1988

Acta Odontologica Scandinavica

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The aims of the study were to adapt a computerized system to epidemiologic conditions, for rapid full-mouth measurements of alveolar bone levels from X5-magnified periapical radiographs and to analyze the variations in measurement due to different system components. Full-mouth measurements of interproximal alveolar bone height in percentage of root and tooth lengths were completed within an average time of 15 min per set of radiographs. An analysis of variance showed that the examiner variation in measurement of a linear scale distance was 0.02 mm. The measurement accuracy was different for different distances; each distance (d) measured with this system should therefore be calibrated with the equation Y = -0.007-0.014 (log3d-1.50), where Y is the estimate of measurement accuracy. The present computerized system enabled rapid recordings and demonstrated good measurement precision and accuracy; these are valuable features in epidemiologic investigations.

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EPIX: an interactive computer application program for cross-sectional epidemiological, periodontal investigations from X-ray films

Cited by 7 publications

References 4 publications

Marginal alveolar bone height in an adult Swedish population

Marginal alveolar bone height in an adult Swedish population

Epidemiological Distribution and Subtype Analysis of Premenstrual Dysphoric Disorder Syndromes and Symptoms Based on TCM Theories

A computerized system to measure interproximal alveolar bone levels in epidemiologic, radiographic investigations: I. Methodologic study

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