Denehy G E, Doering J V, Torney D L
J Prosthet Dent. 1980 Sep;44(3):274-8. doi: 10.1016/0022-3913(80)90010-4.
Properly placed acid-etch Class IV restorations may be dislodged due to occlusal interferences. When restoring an anterior tooth, the dentist should check the three regions of possible incisal prematurities: centric incisal contact, protrusive incisal contact, and midprotrusive incisal contact. By correcting potential problems in these regions before tooth restoration, the dentist helps to ensure longer lasting retention for the restoration.
放置得当的酸蚀处理IV类修复体可能会因咬合干扰而松动。在修复前牙时，牙医应检查可能出现切端早接触的三个区域：正中切端接触、前伸切端接触和前伸正中切端接触。通过在牙齿修复前纠正这些区域的潜在问题，牙医有助于确保修复体获得更持久的固位。
