Is it standard to undergo a vertical sinus lift and implant on the same day?

In answer to your question, it is possible to combine a sinus lift with placing an implant if there is sufficient bone height to achieve primary stability. If there is less than 5mm, I would recommend having the sinus lift first and then waiting for the appropriate time, usually about 6 months, before placing the implant.
However if there is 5mm or more of bone height, I would be happy to combine both treatments. This will avoid the need for a second surgical appointment and shorten the overall time period of the course of treatment.
So in summary it depends on an assessment of the bone available.
In answer to your second question, it is possible to assess the bone using an intra-oral radiograph and does not necessarily need an OPG. The most accurate way to assess the bone is a CT scan, though for an upper premolar this may not be justified.
I hope this is helpful.
Best wishes
Dr Ian Hallam MBE

Hello, The sinus lift surgeries are of two types . Direct sinus lift and Indirect sinus lift. Depending on the bone volume available in the missing tooth region, the dentist decides whether you need Direct Sinus lift or Indirect Sinus lift procedure. Usually if the bone is less than 5mm, the surgeon advises Direct Sinus lift procedure. In this condition, implant is not placed in the same visit, but delayed for 3-4 months for the bone formation.  Whereas in  Indirect sinus lift procedure, the implant placement is done on the same day. The bone volume is measured with 3D scan of the region.

Both procedures are standard, this are the advantages and disadvantages of each one:

Sinus lift, extraction and Implant in a single appointment: This treatment plan option will save you time of completion and one surgical intervention, the healing time for the sinus lift and bone graft itself takes 6-8 months and the implant osteointegration takes approximately 3-4 months more if you qualify for having them done in a single intervention you will be saving at least 4 months.

As any surgical procedure there is a risk of failure, even though the percentage is very low it still an existing risk and the disadvantage of doing everything in a single surgery is that if for any reason your case ends up inside this small percentage of failure both the bone graft and implant will be lost.

Having the sinus lift and then the surgical placement of an implant: This treatment plan is a longer way to go but some how is safer because once we wait 6-8 months after the sinus lift

The surgical placement of the implant will be performed once everything is completely healed and at no risk of failure.