定深法磨牙面預(yù)備空間不足的易發(fā)區(qū)域分析

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[中圖分類(lèi)號(hào)] R783 [文獻(xiàn)標(biāo)志碼] 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，全冠修復(fù)體的牙體預(yù)備仍然以視覺(jué)引導(dǎo)下的定深法預(yù)備為主，由于磨牙面形態(tài)的不規(guī)則，騎面預(yù)備時(shí)可能出現(xiàn)不同程度的誤差[2]，導(dǎo)致修復(fù)空間不均勻，這為修復(fù)體的制作帶來(lái)了困難。（剩余7890字）