Chan K C, Boyer D B
J Prosthet Dent. 1980 Aug;44(2):187-9. doi: 10.1016/0022-3913(80)90136-5.
The retention of Class V inlays cemented to cavities in extracted teeth was significantly increased by placing opposing retentive grooves in the inlays and cavity walls. The set cement formed a bridge between the two retentive grooves.