Mathematical Methods for Assessing the Prognostic of Fixed Partial Dentures Resulting from Evaluating a Group of Dental Patients in Romania

Table 3

The parameters found for evaluating the periodontal prognosis.

𝑎 (1); 𝑆 = (sum of functional values of abutments) − (sum of functional values of missing teeth) (according to Table 1)	𝑎 (2); 𝐿 = (length of the edentulous space)/(sum of the maximum 𝑀-𝐷 size of the missing teeth) * 100	𝑎 (3); Plaque index	𝑎 (4); Gingival index	𝑎 (5); periodontal risk as assessed by Florida Probe software
≥0; 𝑎1=−𝑆∗5; pg = pg + 10; rii = rii + 1	10%–20%; 𝑎2=100−𝐿; pg = pg + 1	0–25%; 𝑎3=PI−100; pg = pg + 4	0–25%; 𝑎4  = GI; pg = pg + 4	High; 𝑎5=100; pg = pg − 4
<0; 𝑎1=−𝑆∗5; pg = pg − 10;	20–30%; 𝑎2=100−𝐿; pg = pg + 2	26–39%; 𝑎3  = PI; pg = pg + 3	26–39%; 𝑎4  = GI; pg = pg + 1	Medium; 𝑎5=66; pg = pg − 3
	30–40%; 𝑎2=100−𝐿; pg = pg + 3	40–69%; 𝑎3  = PI; pg = pg − 2; rii = rii + 1; rcp = rcp + 1; rip = rip + 1	40–69%; 𝑎4  = GI; pg = pg − 2; rii = rii + 1; rcp = rcp + 1; rip = rip + 1	Low; 𝑎5=33; pg = pg + 1
	>40%; 𝑎2=100−𝐿; pg = pg + 4	70–100%; 𝑎3  = PI; pg = pg − 4; rii = rii + 2; rcp = rcp + 2; rip = rip + 2	70–100%; 𝑎4  = GI; pg = pg − 4; rii = rii + 2; rcp = rcp + 2; rip = rip + 2	0; 𝑎5=0