Correlazioni esistenti tra parodontologia e protesi. Utilizzo dello zirconio come materiale protesico nel rispetto dei tessuti parodontali

Traditional mechanic analysis of zirconium prosthesis does not give any biologic information about periodontal aspects. Observation of periodontal conditions are necessary in order to deepen the relationship between zirconium crowns and periodontal tissues. Our aim is evaluation of periodontal effects of zirconium prosthesis in comparison to metal-ceramic crowns. We analyse 45 zirconium crowns applied on 27 patients in study group, prosthesized elements are: 15 central incisors, 12 lateral incisors, 8 canines, 6 first premolars and 4 second premolars. 45 metal-ceramic elements are considered in control group: 6 central incisors, 8 lateral incisors, 8 canines, 15 first molars e 8 second molars. Periodontal evaluations such as plaque index, bleeding, gingival recessions and periodontal probing are performed for each element. We observed a higher rate of 0-plaque and a higher rate of elements without bleeding in study group than control one. There is a lower number of gingival recessions and a less deep probing in study group than control one. In conclusion we can say that zirconia elements are more respectful of periodontal tissues than metal-ceramic crowns.