Grubbs TD, et al. - Four direct restorative materials that can be used in the proximal box elevation (PBE) technique were investigated for efficacy. Researchers randomly assigned 75 molar teeth to one of five groups (n=15): type II glass ionomer (GI), type II resin-modified glass ionomer (RMGI), resin-based composite (RBC), bulk-fill (BF) resin-based composite, and a control with no box elevation procedure. Within the parameters of this study, after mechanical fatigue, results regarding margin quality and fracture resistance were not influenced by the materials used for PBE: RMGI, RBC, and BF. As per collective findings, these materials seem to be unsuitable for PBE procedures . Nevertheless, they recommended practicing caution with any PBE procedure and identified the necessity for further testing of GI materials.