定深法磨牙面预备空间不足的易发区域分析

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[中图分类号] R783 [文献标志码] A [doi] 10.7518/hxkq.2025.2024320

[Abstract] Objective Digitally collect data on the preparation space of the molar occlusal surface for full crowr toration and analyze the minimum preparation spaces and areasprone to insufficientpreparation.MethodsAtotal of846 molars （excluding third molars） designated for repairwith zirconium dioxide crowns were selected.All molarswere prepared byusing the fixed-depth groove method under visual guidance.A digital impression was collected，and the occlusal surface of thepreparation was

dividedintogion：miobccalasiolingualeastobccalastolngala，ialrginalidge distalmarginal ridge.Image measurement software （3Shape Unite）was employed torecordthe smalest preparation space on the molar occlusal surface，and a space of <1mm was defined as insufficient preparation. The chi-square test was utilized forthe statistical analysis of data.ResultsSignificant differences wereobserved in theareas with the smallest preparation space on the occlusal surface of molars across different quadrants （P<0.05 ）.Notably，theareawith thesmallest preparation spaceon theoclusalsurfaceof the maxilary first molar was most frequently found inthe mesiobuccalarea，whereas thesmalest preparation spaces onother molars were predominantly located inthedistolngual area.The insufficient preparation of the occlusal surface occurred in 41.0% （347 cases） of teeth.The distribution of prone areascorespondedwiththe distributionof thesmalestspatial areas.ConclusionAlthough the fixed-depth groove method is employed，the preparation space on the molarsurface unavoidably remains uneven under visual guidance.The identificationof theareas prone to minimum preparation spaces can serveasavaluable guide for clinicians to prevent insufficient preparation.

[Key Words]molar；full-crown restoration；occlusal surface preparation；preparation space

目前，全冠修复体的牙体预备仍然以视觉引导下的定深法预备为主，由于磨牙面形态的不规则，骑面预备时可能出现不同程度的误差[2]，导致修复空间不均匀，这为修复体的制作带来了困难。（剩余7890字）