Splinting different connection implants?
I have a 78 year old patient. He had some zimmer/MIS internal hex connection implants placed 6 years ago. As show on x-rays, He wants to get an implants on the site of #30 and #14. As #13 is missing my idea is to place a wide implant on #14 and then splint it to the implant on #12. We currently place hiossen implants at my practice.
my questions are-
1) Can I place hiossen (Morse connection) on #14 site and then connect it with the internal hex implant on #12. Will there be any issues on stress distribution with the two different types of connections?
2) on implant #29, we can see the micro threads are not in the bone but are just covered by the keratinized gingiva. There is no pain or any symptoms. Is it safe to restore it?
3) can I place an implant between sites of 30 and 31 , and then splint it to the implant on #29 will there be any problems?
Please give your answers based on the case of 79 year old patient, and will you do it any differently if the patient was younger?