Inlay, Onlay or Overlay in 3D Ceramic Restorations? Telling Them Apart by Defect Location and Extent of Coverage｜證據鏈

FAQ

What is the simplest way to tell an inlay, an onlay and an overlay apart?

Look at **how far it covers** (the three boundaries below are general dental terminology; the sources cited in this card do not define them verbatim): an inlay sits within the cavity and covers no cusp; an onlay covers one or more cusps; an overlay covers the whole occlusal surface and every cusp. In the literature, onlays, occlusal veneers and partial crowns are grouped together as **partial coverage restorations**, a category that **does not include inlays** [F1]. The reason for choosing between them is equally concrete: MOD-prepared teeth carry a significant risk of cusp fracture, and both crowns and onlays can reinforce such teeth through cuspal coverage [F3].

インレー、アンレー、オーバーレイの最も簡単な分け方は何ですか — **どこまで覆うか**を見ることです（以下の三つの線引きは歯科の一般的な用語説明であり、本カードが引用した文献は逐語的には定義していません）。インレーは窩洞内に詰めて咬頭を被覆せず、アンレーは一つまたは複数の咬頭を被覆し、オーバーレイは咬合面全体とすべての咬頭を被覆します。文献ではアンレー、オクルーザルベニア、パーシャルクラウンの三つをまとめて**部分被覆修復物**と呼び、**この範疇にインレーは含まれません** [F1]。どれを用いるかを決める理由も具体的です。MOD 形成を受けた歯には有意な咬頭破折のリスクがあり、クラウンとアンレーはいずれも咬頭被覆によってこうした歯を補強できるからです [F3]。

What is the simplest way to tell an inlay, an onlay and an overlay apart? — Look at **how far it covers** (the three boundaries below are general dental terminology; the sources cited in this card do not define them verbatim): an inlay sits within the cavity and covers no cusp; an onlay covers one or more cusps; an overlay covers the whole occlusal surface and every cusp. In the literature, onlays, occlusal veneers and partial crowns are grouped together as **partial coverage restorations**, a category that **does not include inlays** [F1]. The reason for choosing between them is equally concrete: MOD-prepared teeth carry a significant risk of cusp fracture, and both crowns and onlays can reinforce such teeth through cuspal coverage [F3].