Thank you for your question and welcome to Just Answer.
I find it hard that if you are prepared to spend $15,000 at your dentist's office for a permanent prosthesis, why he is going to make you wait an entire week with a broken temporary bridge. I would call him tomorrow and remind him of this. Regardless of your large treatment plan, your dentist should have emergency time reserved in his schedule to take care of these kinds of things, whether it be a single tooth temporary or an entire bridge temporary like yours.
The reason I tell you this is because there is no over the counter adhesive or glue that will work to re-cement your temporary bridge successfully. Super glue, in addition to its toxicity, does very poorly in a wet environment. Marine silicone adhesive also does poorly in the mouth.
You have a legitimate dental emergency. I suggest you insist you have this taken care of in the next day or two by your dentist.
I hope this answers your question. If you would like to discuss this further or have any additional questions, please reply to my answer and I will get right back to you.
Sincerely, XXXXX XXXXX DDS
If your dentist is out of the office then he is legally obliged to have a colleague of his taking his emergency calls and you should be referred to that dentist to take care of your temporary bridge. I would hope he was NOT punishing you for seeking treatment elsewhere. Patients are still free as consumers to shop for the best value for their money and your dentist should not be bothered by this reality. I hope this helps.