It is always better for the tooth to restore it immediately to prevent leakage of oral fluids into the root canal space. If this can not be done due to the length of the procedure or patient comfort, then a seal over the root canal area and a restoration as soon as possible is recommended.
Source: Glassman G, Bioactive Endodontic Obturation: Combining the New with the Tried and True, Oral Health, May 2014, Vol 9, No 4, pg 18-28.
Hans Skariah, B.Sc., DMD
Promenade Court Dental
2233 Hurontario St., Mississauga, ON, Canada (905) 273-7100
43 Albert St. West, Unit 8, Plattsville, ON, Canada (226) 656-1000