Clinical performance evaluation of screw- and cement-retained implant restorations- An up to 10 year retrospective research

Abstract

Objectives: The aim of this study is to evaluate the clinical performance of two types of retained dental implant therapy on the basis of Implant Quality Scale. Materials and methods: Thirty-five patients with 41cement-retained and 38 screw-retained implant restorations were evaluated using parameters including pain/sensitivity on function, mobility, marginal bone loss (MBL), probing depth (PD), plaque index (PI), sulcus bleeding index (SBI), peri-implant inflammation. Results: No pain but one implant-retained restoration of each group showed mobility. Probing depth of cement -retained group was higher than that of screw-retained group(P<0.05). The average MBL with cement-retained and screw-retained restoration was 0.3571±0.5688 mm and 0.5395±0.78567mm, which was not significantly different between the two groups(P>0.05), yet 2 screw-retained crowns were detected with bone loss of 2-3mm. The results of plaque index, sulcus bleeding index and inflammation demonstrated that the cement-retained group accounted for a higher proportion when same score, or a higher incidence in the higher grade. There were significant positive Spearman correlations among Plaque index, sulcus bleeding index and peri-implant inflammation. Conclusion: Compared with the screw-retained group, the cement-retained group showed similar failure rates but higher success rates. However, excess cement and adaptation of porcelain materials could strengthen plaque accumulation hence resulting in more severe inflammatory performance in the cement-retained group.