Effect of cementation technique aplied for singletoothimplant crowns on residuel cement

CORDANOĞLU EREN N, Effect of cementation technique aplied for singletooth implant crowns on residuel cement. Hacettepe University Faculty of Dentistry, Thesis in Prosthodontics, Ankara, 2018. Remaining cement has been shown to be associated with periimplant inflammation. The purpose of this study was to investigate and compare the amount and distribution of excess cement after cementation with different techniques of cement application for cement-retained implant-supported restorations. Thirty implants in twenty four patients were randomized to three different technique of cement application: 1) application to all internal surfaces of the crowns using microbrush, 2) full fill the crowns and 3) filled the coronal half of the crown. For each implant, one cement-retaining PMMA test crown were produced. The abutments used for cement-retaining test crowns were selected in the mouth as the buccal margin location would be equally with gingival level. The location of the margin of each implant was measured with a periodontal probe mesially, distally, buccaly, and lingually. Test crowns were attached to abutments by use of permanent zinc polycarboxylate cement. Then the abutment/crown unit was unscrewed and remnant cement in the soft tissue were recorded. The crown-abutment complexes were scanned with the 3shape intraoral scanner. STL images were evaluated using the Geomagix Design X program. In general, in the crowns and abutment regions, the presence, the amount and distribution values of remnant cements are found to be higher in the full fill method than in the other methods, but this difference was not statistically significant (p>0.05). In addition there was also an increase in amount and distribution values of remnant cement at buccal and distal surfaces and at increased depths of abutment margins (p>0.05). There was no statistically significant difference between methods in terms of presence of cement in soft tissue (p>0.05). As a result, although there are more cement increases in the full filling method; other methods for reducing the amount of cement used do not guarantee avoidance of subgingival cement residues after crown cementation. Key Words: Cementation, dental implant, abutment, residual cement, cement application technique