The application of the hottelling statistic for detecting the defects in the dental enamel surface
by
José Italo Cortez
Coauthors: González Flores Marcos, Caldera Miguel Javier, Cortez Liliana, Ramírez Popo J, Reyes Cervantes Hortensia

This work will show the acquisition and the process of the roughness data of the dental enamel surface, which will permit to detect the physical defects (desmineralize areas) in the dental enamel through the comparison of the medium values and the generated samples by the orthodontic sequence process. In fact, the computer problem needs to compare the medium values of the two samples; it is synthesized by the Covariance matrix from the data matrix of each sample, after it is obtained an estimation of both matrixes. , the matrix obtains the inverse and the hottelling statistics are calculated T2 and F for the multidifferent data to demonstrate the differences in the medias vectors. The performed experiment permitted to confirm that the orthodontic treatment generates physical changes in the dental enamel; it was proved the null hypothesis, it states that the equal medias vectors, are rejected.

As a conclusion it was used the third part of the mesial as the main are in the experiment, where the samples were compared, without treatment and the samples with toothpaste application; samples without treatment and samples with engraving acid and samples without treatment and samples with the application of glass ionomer cement; samples with toothpaste and engraving acid; with toothpaste and glass ionomer cement and the last with the engraving acid application. Therefore, the comparison permits to prove the hypothesis that the medias vectors are equals or no; on the other hand, it demonstrates that there are physical changes in the application of each stage of the orthodontic process. The results permit to reject the hypothesis that the medias vectors are equal; it is more evident during the application of the stages in the orthodontic process.

Finally, the results are satisfactory and it is necessary to keep working in this technique for future analysis and distinct areas of the tooth.

Date received: October 28, 2005