Answer:
Pyorrhea, or periodontal disease, is only related to Type 1 Diabetes, and is not directly linked to it being the cause of Type 1 Diabetes or vice versa.
Periodontal disease is only related to Type 1 Diabetes in the sense that a study showed that Type 1 Diabetics showed deeper periodontal pockets and more periodontal attachment loss as opposed to non-diabetics. Those traits are the most common on patients with Pyorrhea, or periodontal disease.
These symptoms of periodontal disease seem to appear among Type 1 Diabetics because some Type 1 Diabetics do not have very great metabolic control, which could lead to higher susceptibility and a greater sign of symptoms in Type 1 Diabetics. Type 1 Diabetics do not have these symptoms, but rather have a greater appearance of what a symptom is close to and thus have a higher susceptibility to Pyorrhea.
View the Related Link below for the study (you need a PDF Document viewer).