Effect of Quality of Dental Restorations and Time Elapsed Since Placement on Biofilm Retention

Svrha: U istraživanju se željela procijeniti povezanost zadržavanja biofilma i vremena proteklog otkako je postavljen na smolom restaurirane površine prednjih zuba. Metode: Uzorak se sastojao od 120 zuba 40 pacijenata obaju spolova u dobi između 16 i 60 godina. Ukupno je na njima bilo 230 restauriranih površina. Za mjerenje stupnja zadržavanja biofilma i površinske hrapavosti materijala te vrste kaviteta i rubova bili su potrebni indeks zadržavanja plaka i opseg restauracija (PRRI), a procjenjivala su se i vanjska svojstva preparacije kaviteta. Rezultati: Gotovo sve proučavane površine bile su postavljene prije jedne do pet godina. Najčešći PRRI za zadržavanje biofilma je bio II i IV, 83 posto uzoraka imalo je grubu površinu, a 46,5 posto kavitete II. razreda. subgingivno je bilo 62,2 posto rubova, a kod 38,6 posto zabilježen je višak korištenog restaurativnog materijala. Površinska hrapavost restauracije bila je usko povezana sa zadržavanjem biofilma i vremenom postavljanja (oba p<0,01). Vanjska svojstva restauracije (prekonturiranje, manjak materijala za restauraciju, spoj zub – restauracija) također su značajno bili povezani s vremenom proteklim od postavljanja (svi p<0,05). Zaključak: Vrijeme proteklo od postavljanja smolaste restauracije utječe na hrapavost površine i stupanj zadržavanja biofilma.Objective: The aim of this study was to evaluate associations of biofilm retention on resin-restored surfaces of anterior teeth with quality and time elapsed since placement. Methods: The study sample comprised 120 teeth with 230 restored surfaces in 40 patients of both sexes aged 16–60 years. The Plaque Retention and Extension in Restoration Index (PRRI) was used to measure the degree of biofilm retention, and the surface roughness of the material, cavity type and margins, and external cavity preparation characteristics were also evaluated. Results: Most surfaces analysed had been placed 1–5 years previously. The most prevalent PRRI biofilm retention scores were III and IV, 83.0% of samples presented surface roughness, 46.5% of cavities were class III, 62.2% of surfaces had subgingival margins, and 38.6% retained excessive restorative material. Surface roughness was significantly associated with the degree of biofilm retention and time elapsed since placement (both p < 0.01). Three external cavity preparation characteristics (over-contouring, lack of restorative material, tooth–restoration interface) were also associated significantly with the time elapsed since placement (all p < 0.05). Conclusion: The time elapsed since the placement of resin restorations influences surface roughness and the degree of biofilm retention