Patho-morphological study of the supplemental groove

Authors

  • Y Awazawa
  • K Hayashi
  • H Kiba
  • I Awazawa
  • H Tobari

Keywords:

groove contents, primary caries, supplemental groove, light and electron microscopy

Abstract

The following results have been obtained in consequence of patho-morphological examination regarding the supplemental groove.

1. Light microscopic observation of cross-sectioned supplemental grooves revealed that most of them were shallow in the form of plate or bowl. Some of the supplemental grooves had contents not described in the past and the structure of the contents was not clear under a light microscope. The contents were found in 22% of the supplemental grooves examined.

2. The contents in supplemental grooves which were confirmed under a light microscope were found to consist of enamel itself when examined by means of an electron microscope. Microhardness measurements of this enamel showed less than one third the values of normal enamel. By means of microradiography, it was established that radiolucency of this enamel was, for the most part, much higher than normal enamel.

3. It was ascertained that enamel with low hardness and high radiolucency constitutes the contents of supplemental grooves. Judging from its tissue properties, the contents were believed to be susceptible to attack by caries. This view was supported by the results of an investigation of caries sites in supplemental grooves.

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Published

2020-04-17

Issue

Vol. 32 No. 3 (1989)

Section

Original Research Articles

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I hereby certify that the authors of the above manuscript have all:

1. Conceived, planned, and performed the work leading to the report, or interpreted the evidence presented, or both;

2. Written the report or reviewed successive versions and shared in their revisions; and

3. Approved the final version.

Further, I certify that:

1. This work has not been published elsewhere and is not under revision in another journal;

2. Humane procedures have been followed in the treatment of experimental animals (if applicable);

3. Investigations in humans was done in accordance with the ethical standards of the responsible committee on human experimentation or with the Helsinki Declaration (if applicable).

4. This paper has been carefully read by a native English speaker who is familiar with the field of work (this applies to authors who are not fluent in English); and

5. The copyright of the article is transferred from the authors to the Bulletin du Groupement International pour la Recherche Scientifique en Stomatologie et Odontologie upon acceptance of the manuscript.