儿童时期恒牙釉质显微硬度及微观结构研究

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[中图分类号] R788[文献标志码] A [doi] 10.7518/hxkq.2025.2025161

[Abstract]ObjectiveThrough the investigationofthe microhardnessand microstructure of permanent tooth enamel at various eruption stages duringchildhood，this research ofers references fortheearly preventionofchildhood dental caries.MethodsForty-five premolars extracted duetoorthodonticreasons werecollctedand screened.These premolars were divided into three experimental groups according to the time since eruption： Group A（erupted forO-1year）， GroupB（eruptedfor1-3years），andGroupC（eruptedfor3-5years）.Additionally，thethirdmolarsthat wereextracted due to impactionandhadnot erupted were selectedasthecontrol group，with15teth ineach group.Samples were prepared，and thesurface microhardness，microstructure，and elemental compositionof theenamel were measured using Vickers microhardness tester，scanning electron microscope，and electron probe，respectively.ResultsCompared with thatinthecontrolgroup，themicrohardnessofenamelingroupsA，B，andCincreasedwithprolongederuptiontime，the surface porosity structure decreased considerably，the contents ofNaand Mg on the surface decreased，and that ofF increased （P<0.05） .ConclusionThe microhardness and microstructure of enamel in permanent teeth at different stages vary.Permanent teth areatasubstantially higherriskofcarieswithinoneyearafter eruption，andearly prevention should be emphasized.

[Key words] children; immature permanent teeth；enamel; post-eruptive maturation; microstructure

釉质是牙齿最外层的坚硬结构，主要由羟磷灰石晶体构成。（剩余10678字）