capability of retaining the provisional crown for months, but easy on removal of the temporary prosthesis; easy removal of excess cement from around the margins; good marginal seal; and compatibility with provisional restorations. Adhesive cements should be avoided as they are difficult to remove. Eugenol containing products are advantageous as they are adhesive without being difficult to remove. However, eugenol has an inhibitory effect on the polymerisation of methacrylate-based resins, and may potentially lead to a lower resin-dentine bond strength. Prior to the cementation of the provisional crown, the occlusion should be checked. Any deficiencies in the provisional crown can be amended by the addition of more temporary crown and bridge material, or a light cured composite. If a temporary crown becomes de-cemented, it is important that a dentist examine the patient as overeruption of the opposing teeth may prevent accurate fitting of the final crown. If a dentist cannot be seen in a timely manner, the temporary crown may be re-cemented by applying temporary cement to the temporary crown. Materials A systemic study found that di-methacrylate-based provisional restorations had better flexural strength and hardness than the mono-methacrylate-based ones, while, within the mono-methacrylate group, poly-methylmethacrylate showed better flexural strength than poly-ethylmethacrylate. Oral hygiene Oral hygiene tooth brushing and flossing is crucial to prevent gingival inflammation and bleeding. Patients are advised to pull the dental floss out buccally instead of pulling back up through the contact point. This is to avoid accidentally pulling out a provisional restoration. References Prosthodontology Restorative dentistry