Procedures for Computing the Mean Age of Eruption of Human Teeth

Hayes, Richard L.; Mantel, Nathan

doi:10.1177/00220345580370052401

Cited by 53 publications

(25 citation statements)

References 3 publications

(1 reference statement)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…• Manual method [9][10][11]. For each tooth, the age was approximated to the nearest month and then all children in the sample of the same age were grouped.…”

Section: Discussionmentioning

confidence: 99%

Timing of deciduous teeth emergence in Egyptian children

Nl¹,

Ma²,

Rm³

et al. 2011

East Mediterr Health J

View full text Add to dashboard Cite

The existing eruption schedules for permanent and deciduous dentition are based on studies in industrialized countries. This study determined the dates of emergence of deciduous teeth in a cross-sectional sample of 1132 Egyptian infants aged 4-36 months selected from different governorates of Egypt. The dates of emergence of individual teeth were calculated using Probit analysis. The mandibular left and right incisors were the earliest teeth to emerge at a mean of 8.0 months in boys and 7.9 months in girls. The sequence of eruption followed a typical pattern. The average time from emergence of the first tooth to the last tooth was 17.8 months in the mandible and 15.8 months in the maxilla for boys and 22.1 and 20.1 months respectively for girls. Four active phases of emergence were identified and compared with data from other countries.

show abstract

“…• Manual method [9][10][11]. For each tooth, the age was approximated to the nearest month and then all children in the sample of the same age were grouped.…”

Section: Discussionmentioning

confidence: 99%

Timing of deciduous teeth emergence in Egyptian children

Nl¹,

Ma²,

Rm³

et al. 2011

East Mediterr Health J

View full text Add to dashboard Cite

show abstract

“…If we believe that deviations due to variations in many alleles or environmental conditions result in percentage differences, instead of additive differences, tooth emergence times should be lognormally distributed when measured from the start of emergence. Timing from conception was suggested by Kihlberg and Koski (1954) and Hayes and Mantel (1958) and has been used or discussed in a few other studies (Magnú sson, 1982;Smith et al, 1994).…”

Section: Resultsmentioning

confidence: 99%

“…A second focus extends the method to incorporate and estimate the proportion of agenic teeth. Accordingly, we follow the lead of Hayes and Mantel (1958) who described a nonparametric method for estimating median times to emergence along with an agenic proportion. An agenic fraction introduces no analytic difficulty if all individuals are followed longitudinally until all teeth that will emerge do so.…”

mentioning

confidence: 99%

“…Finally, we revisit the issue of the proper parametric distribution to use for the analysis of tooth emergence (Klein and Palmer, 1937;Kihlberg and Koski, 1954;Hayes and Mantel, 1958). Specifically, whether a normal, lognormal, or a shifted lognormal distribution 1 best describes tooth emergence.…”

mentioning

confidence: 99%

“…The resulting nonparametric distributions can be used to assess how well each parametric form estimates parameters like means, medians, and variances. We are addressing the same issues that Hayes and Mantel (1958) did when they compared a nonparametric cross-sectional analysis method to probit analysis, except that we compare two longitudinal methods: life table estimates and parametric survival analysis.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Longitudinal analysis of deciduous tooth emergence: II. Parametric survival analysis in Bangladeshi, Guatemalan, Japanese, and Javanese children

Holman

Jones

1998

Am. J. Phys. Anthropol.

View full text Add to dashboard Cite

We present a form of parametric survival analysis that incorporates exact, interval-censored, and right-censored times to deciduous tooth emergence. The method is an extension of common cross-sectional procedures such as logit and probit analysis, so that data arising from mixed longitudinal and cross-sectional studies can be properly combined. We extended the method to incorporate and estimate a proportion of agenic teeth. While we concentrate on deciduous tooth emergence, the method is relevant to studies of permanent tooth emergence and other developmental events. Deciduous tooth emergence data were analyzed from four longitudinal studies. The samples are 1,271 rural Guatemalan children examined every three months up to age two and every six months thereafter as part of the INCAP study; 397 rural Bangladeshi children examined monthly to age one and quarterly thereafter as part of the Meheran Growth and Development Study; 468 rural Indonesian children examined monthly as part of the Ngaglik study; and 114 urban Japanese children examined monthly in studies from 1910 and 1920. Although all four studies were longitudinal, many observations from the Guatemala and Bangladesh studies were effectively cross-sectionally observed. Three different parametric forms were used to model the eruption process: a normal distribution, a lognormal distribution, and a lognormal distribution with age shifted to shortly after conception. All three distributions produced reliable estimates of central tendencies, but the shifted lognormal distribution produced the best overall estimates of shape (variance) parameters. Estimates of emergence were compared to other studies that used similar methods. Japanese children showed relatively fast emergence times for all teeth. Bangladeshi and Javanese children showed emergence times that were slower than are found in most previous studies. Estimates of agenesis were not significantly different from zero for most teeth. One or two central incisors showed significant agenesis that ranged from 0.1 to 0.8% in three of the samples; even so, failure to model the agenic proportion did not seriously bias the estimates.

show abstract

Dental emergence among urban Zambian school children: An assessment of the accuracy of three methods in assigning ages

Gillett

1997

Am. J. Phys. Anthropol.

View full text Add to dashboard Cite

In situations where birth records are unavailable and stated ages are unreliable, the emergence of the permanent dentition can serve as an indicator of age. Due to substantial variation in the timing of tooth emergence, a sample (n = 721) of Zambian school children, with known ages, was examined to provide a tooth emergence reference standard for the area. Three methods for assigning ages were utilized and their accuracy assessed. A random test sample was withheld from the original study in order to further evaluate the methods' accuracy. The three methods-1) number of teeth, 2) regression and 3) probit analysis-were applied to Zambian children, and estimates of age were made. Predicted ages were compared to actual ages to determine the percentage of accuracy in three categories-(+/-) .5, +/- 1.0 and +/- 2.0 years- and paired t-tests were conducted. Each of the three methods was then applied to the test sample, and their accuracy was evaluated in the same manner. Methods 1 and 2 were found to provide the higher percentage of correct ages within +/- .5 years, assigning roughly 39% of both male and female children within this increment. This was also the case at the next increment, with methods 1 and 2 assigning a higher percentage (66-76%) of children to the +/- 1.0 year category, while the accuracy of method 3 was quite a bit lower. The results for the test sample were very similar to those of the main sample. The overall accuracy of methods 1 and 2 was very similar in both the main and test samples, while method 3 had lower accuracy and t-tests indicated significant differences. Therefore, due to ease of application in the field setting, method 1, mean age per number of teeth emerged, is the method of choice.

show abstract

Procedures for Computing the Mean Age of Eruption of Human Teeth

Cited by 53 publications

References 3 publications

Timing of deciduous teeth emergence in Egyptian children

Timing of deciduous teeth emergence in Egyptian children

Longitudinal analysis of deciduous tooth emergence: II. Parametric survival analysis in Bangladeshi, Guatemalan, Japanese, and Javanese children

Dental emergence among urban Zambian school children: An assessment of the accuracy of three methods in assigning ages

Contact Info

Product

Resources

About