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Approximal morphology as predictor of approximal caries in primary molar teeth

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Abstract

Objective

To evaluate the predictive power of the morphology of the distal surface on 1st and mesial surface on 2nd primary molar teeth on caries development in young children.

Sample and methods

Out of 101 3-to 4-year-old children from an on-going study, 62 children, for whom parents’ informed consent was given, participated. Upper and lower molar teeth of one randomly selected side received a 2-day temporarily separation. Bitewing radiographs and silicone impressions of interproximal area (IPA) were obtained. One-year procedures were repeated in 52 children (84%). The morphology of the distal surfaces of the first molar teeth and the mesial surfaces on the second molar teeth (n=208) was scored from the occlusal aspect on images from the baseline resin models resulting in four IPA variants: concave-concave; concave-convex; convex-concave, and convex-convex. Approximal caries on the surface in question was radiographically assessed as absent/present.

Results

Of the 52 children examined at follow-up, 31 children (60%) had 1–4 concave surfaces. In total 53 (25%) of the 208 surfaces were concave. A total of 22 children (43%) had 1–4 approximal lesions adding up to 59 lesions. Multiple logistic regression analyses disclosed that gender, surface morphology on one of the approximal surfaces (focus-surface), and adjacent-surface morphology were significantly related to caries development (p values ≤ 0.03). The odds ratio for developing caries in the focus-surface/adjacent-surface in the four IPA variants were convex-convex, 1.0; convex-concave, 5.5 (CI 2.0–14.7); concave-convex, 12.9 (CI 4.1–40.3); and concave-concave, 15.7 (CI 5.1–48.3).

Conclusion

Morphology of approximal surfaces in primary molar teeth, in particular both surfaces being concave, significantly influences the risk of developing caries.

Clinical relevance

The concave morphology of approximal surfaces can predict future caries lesions supporting specific home-care and in-office preventive strategies.

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Acknowledgements

The authors would like to thank the community department, the dental school at Universidad El Bosque, and the Social District Secretary of Integration, Usaquén for their collaboration in the children location. Cristhian Cardenas is acknowledged for examining the radiographs and Dennis Pipenbring for assistance with the statistical analyses. Staff members at UNICA are acknowledged for support at the clinical examinations and staff members of the kindergartens for their valuable help during the daily running of this study. We are also grateful to the children and their parents involved in the study.

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Correspondence to Kim Rud Ekstrand.

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The authors declare that they have no conflict of interest.

Funding

The study was partially funded by COLCIENCIAS (646–2014), Universidad El Bosque University of Copenhagen and Colgate Palmolive U.K.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed consent

Informed consent was obtained from all individual participants included in the study.

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Cortes, A., Martignon, S., Qvist, V. et al. Approximal morphology as predictor of approximal caries in primary molar teeth. Clin Oral Invest 22, 951–959 (2018). https://doi.org/10.1007/s00784-017-2174-3

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  • DOI: https://doi.org/10.1007/s00784-017-2174-3

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