华西口腔医学杂志2025，Vol.43Issue(2)：163-174,12.DOI:10.7518/hxkq.2025.2024379
边缘区预备体边缘、修复体边缘、粘固(粘接)层及龈缘的几何位置关系——边缘位置的新分类与新方案
Geometric position relationship between gingival,preparation,restoration margins and the cementation(adhe-sive)layer in the marginal area:new classification and scheme for margin position
摘要
Abstract
The current low quality of fixed restoration margins is highly correlated with the high incidence of margin-related complications.It is also related to the unclear spatiotemporal geometric position relationship among the consen-sus definitions of the gingival margin(G),preparation margin(P),and restoration margin(R).This paper dis-cusses the existing problem of the existing term"gingival margin"as a surface anatomical landmark;proposes the term"free gingival margin line"that conforms to geome-try and measurement and has importance as a surface anatomical landmark;and clarifies the participants that exist in the marginal area.These participants include the P,R,and G;cementation(adhesive)layer;and gingival sulcus.Moreover,this paper discusses the various iatrogenic damages induced by entering the gingival sulcus via the P,R,and cementing(adhesive)layer.Through the discussion of the design deficiencies of the subgingival and biologically oriented prepara-tion technique,the physiological and clinical importance of the concept of gingival sulcus/gingival sulcus fluid+super-crestal tissue attachment(biological width)=first periodontal protective barrier was analyzed.The value of preserving the physiological role of the gingival sulcus is emphasized.Furthermore,the newly defined RPG distance represents the distance between the successive P or R line and free G line and can be measured in the clinical procedure of tooth prepa-ration.The optimal solution is 0-200 µm,that is,RPG200:the P and R are located on the free G line and the distance be-tween these margins is less than 200 µm.This distance not only has the aesthetic effect of invisibility to the naked eye,it also has a minimal effect on the G and gingival sulcus and is convenient for doctors and patients to clean.Furthermore,in accordance with the positional relationship between the three margins and cementation(adhesive)layer,a new classifi-cation of marginal positions is proposed.This classification overcomes the problems of incomplete inclusion objects and uncontrolled risk factors in the previous classification.It also has the advantages of strong practicability,good efficiency of main control geometric quantity,and clear risk control points.The new design scheme and classification of the margi-nal position of RPG200 proposed in this paper provide a new understanding for margin design and complication preven-tion in the future.关键词
龈缘(线)/预备体边缘/修复体边缘/目标修复空间/龈沟生理作用/显微修复与制作/生物学宽度/生物导向性预备技术Key words
gingival margin(line)/preparation margin/restoration margin/target restorative space/physio-physiologic function of gingival sulcus/micro-prosthodontics and fabrication/biological width/biologically orien-ted preparation technique分类
口腔医学引用本文复制引用
于海洋,罗天..边缘区预备体边缘、修复体边缘、粘固(粘接)层及龈缘的几何位置关系——边缘位置的新分类与新方案[J].华西口腔医学杂志,2025,43(2):163-174,12.基金项目
Investigator-initiated Trial Project of Health Commission of Sichuan Province(230LCYJ017) 四川省卫生健康委员会研究者发起的临床研究项目(230LCYJ017) （230LCYJ017）
