Repairs won’t stay for long actually, if you want to save money and fitting of old bridge is fine then get same fixed back but in all circumstances a new one with current measurements will be best to use.
Next Steps
Get fitting of your old bridge evaluated by your dentist, if fitting and sealing is serving then go for same with it without repair. Else get a new one made so that for next 15-20 yrs you are safe.
Health Tips
Always opt warranted product you can opt metal ceramic bridge with warranty. Cost 4-6k per unit(for metal ceramic) and your bridge has three units.