Enamel incremental markings in the deciduous teeth of children from the Early Bronze and modern ages

Šipovac, Milica; Petrović, Bojan; Amzirkov, Mina; Stefanović, Sofija

doi:10.1016/j.archoralbio.2023.105635

Cited by 3 publications

(1 citation statement)

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“…On the other hand, striae of Retzius, which appear under optical microscopy as dark bands running from the enamel dentine junction (EDJ) to the outer enamel, are the result of slight variations in matrix secretion due to a still debated biorhythm [20,[30][31][32][33][34][35][36]. Moreover, the identification of stress markers, such as Accentuated Lines (ALs, more pronounced striae of Retzius) and the Neonatal Line (NNL, an AL that forms at birth), allows us to identify respectively the occurrence of physiological stressors during dental development and the birth event [9,[37][38][39][40][41][42][43][44][45]. These latter lines act as permanent records of physiological stress events above a certain thresholdincluding birth, illnesses, and nutritional deficiencieswhich are permanently etched within the enamel's microstructure during its formation [11,[46][47][48][49].…”

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confidence: 99%

Enamel histomorphometry, growth patterns and developmental trajectories of the first deciduous molar in an Italian early medieval skeletal series

Magri,

Higgins,

Lugli

et al. 2024

Preprint

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Understanding the growth patterns and developmental trajectories of teeth during early life stages provides valuable insights into the ontogeny of individuals, particularly in archaeological populations where such information is scarce. This study focuses on first deciduous molars, specifically investigating crown formation times and daily secretion rates, through histological analysis. A total of 34 teeth from the Early Medieval necropolises of Casalmoro and Guidizzolo (Mantua, Lombardy, northern Italy) were analysed assessing growth parameters and identifying possible differences between sites and between sexes, which are determined through proteomic analysis. Furthermore, a robust linear regression model relating prism length and secretion time was built to estimate growth rates also in teeth in which the finest incremental markings are not visible. The daily secretion rates (DSR) in inner enamel showed a high homogeneity between dental arches, sexes and the two sites. Values fall within the known range reported in the literature for the same tooth class in archaeological populations. However, a difference in DSR was observed when compared with modern sample published values. Crown formation times and age at crown completion is different between dental arches, with maxillary first molars initiating their matrix apposition earlier than mandibular molars as formerly reported. However, no significant differences were highlighted in association with sex. This study expands our understanding of the growth and development of first deciduous molars in a medieval population, providing valuable insights into growth trajectories specific to the dental arch. These findings highlight the need for extensive investigations using similar methodologies to attain more accurate and comprehensive information about the developmental patterns of first deciduous molars and underscore the potential use of proteomic analysis to explore deciduous teeth microstructure even in archaeological populations.

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