Purpose:The purpose of this study is to evaluate Ti-base abutment's three different heights and three different cement types on the pull-off force of zirconia-based restorations.Materials and Methods: A total of 90 fixture lab analogs were embedded in auto polymerizing resin bloack.90 Ti-base abutments heights of 3 mm, 5 mm, 7 mm were scanned and zirconia restoration were prepared from scanned files.Zirconia restoration were cemented with three different types of cements (temporary, semipermanent, permanent) following manufacturer's instructions.All 90 specimens were placed and tested in a universal testing machine for pull-out testing.Retention was measured by recording the force at load drop.Statistical analysis was performed using Kruskal-Wallis test for detecting whether there are any statistical significance along cement types or abutment heights.After that, Mann-Whitney test was used for figuring out differences regarding abutment height and the comparison between 3 cements.Results: Temp bond showed significantly lower pull-off force compared to Fujicem regardless of any abutment height.However, there were significant differences between Cem-implant and Fujicem in abutment height of 3 mm and 7 mm, but there was no significant difference in 5 mm.Temp bond and Cem-implant had significant differences only in abutment height of 5 mm. Conclusion:Although Ti-base abutment height did not influenced zirconia restorations' retentiveness, cement types showed significant differences.

Purpose : The purpose of this study was to compare the wettability of 4 type of denture relining materials by measuring contact angle with saliva substitute.0DWHULDOV DQG PHWKRGV +HDWFXUHG UHOLQH UHVLQ9HUWH[ 56 6HOIFXUHG UHOLQH UHVLQ3UREDVH &ROG 7RNX\DPD 5HEDVH soft liner(COE Soft) were fabricated as specimens.Before and after storage in saliva substitute for 24 hour, contact angle between specimens and CMC based saliva substitute(Xerova soln) were measured.&RQWDFW DQJOH DFFRUGLQJ WR GHQWXUH UHOLQLQJ PDWHULDOV ZHUH