Effect of Er: YAG laser irradiation on wettability, surface roughness, and biocompatibility of SLA titanium surface: an in vitro study Nader Ayobian-Markazi,*Mohammadreza Karimi,Ali Safar-Hajhosseini *Periodontic Department,Dental Branch,Islamic Azad University
Abstract
Purpose: The purpose of this study was to
evaluate the effects of the surface treatment on the retention of implant
supported zirconia restorations over short abutments. Material and methods: Eighty solid abutments reduced to 3 mm in height and their corresponding fixture replicas were embedded vertically in autopolymerizing acrylic resin blocks. Eighty zirconia copings (Cercon) with an occlusal loop were fabricated and divided into 2 groups (n¼40). One group was airborne-particle abraded with 110 mm aluminium oxide and the other group was treated with silica coating (Rocatec System). Each group was then divided into 4 subgroups (n¼10). The subgroups received either no treatment (control) or were treated with silane (Clearfil Porcelain Bond ActivatorSE Primer), acid etching followed by silane, or ceramic primer (Clearfil). All copings were luted with a self-adhesive luting agent (Clearfil SA). After 1 week of conditioning in artificial saliva and thermal cycling (5000 cycles, 5_C-55_C), the removal force of the copings were tested with a universal testing machine at a 5 mm/min crosshead speed. The dislodgment force and failure mode were recorded. Two-way ANOVA and the Tukey honestly significant difference and the Fisher exact tests were used for data analysis (a¼.05). Results: The highest retentive values
were obtained for airborne-particle abrasion–ceramic primer (228.84 N) and
silica coating–ceramic primer (230.37 N), which were not significantly
different from silica coating alone (216.26 N; P¼.95) or a combination of
airborne-particle abrasion followed by silanation (211.67 N; P¼.87). The
failure mode was primarily adhesive and cement principally remained on the
copings. Conclusions: Within the limitations of this study, ceramic primer that contains adhesive phosphate monomer significantly improved the retention of zirconia ceramic restorations. Silicoating as a mechanical treatment provided greater retention for zirconia copings than airborne-particle abrasion when a resin-luting agent was used.
The Journal
of Prosthetic Dentistry / 2014;112:38-44. | 
