Hello Sir, if there are teeth missing they can be replaced by Dental Implants (screws as u mentioned). This is a fixed treatment option available for replacing missing teeth.
However since you are Diabetic, normal blood
sugar levels are essential for this implant surgical procedure to be carried out. Also Diabetic patients tend to have a faster rate of bone loss, so the amount of bone inside needs to be analysed to plan for a Dental Implant.
HbA1c is a test done to check for
diabetes control and if the control is good and all values are normal and sugar levels are maintained normal even in future, after implant treatment, then u could go for it.