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Introduction: The resin cement is recommended to cement the implant fixed prosthesis. Efforts to remove the excess cement
protruding after seating restoration, an entrapment of residual cement in the peri-implant tissues can be detected.
Objective: The aim of this study was to detect the retained excess resin cement around tissue level and bone level dental
implants following two different cementation techniques.
Materials and Methods: Fourteen tissue level implants (group A) and fourteen bone level implants (group B), (OCO
Biomedical, Inc. Albuquerque, USA) were screwed in a drilled models (Salvin Dental Specialties, Inc. Charlotte, USA) having
a rubber surface covering, simulating the gingiva. Twenty-eight metal copings were fabricated and were cemented to the
implant???s abutments by RelyX U200 dual cure resin cements. Each group was further sub-divided according to the cementation
technique into two subgroups (n=7): sub-groupA1, B1: Tack cure of the excess cement for three seconds and the excess partially
set resin cement was carefully removed before complete cure. And subgroup A2, B2: 1mm occlusal vent was performed on
the occlusal surface of the metal copings. Excess cement from the vent and the margins was carefully removed followed by
a full cure. The rubber coverage on the models was removed and any retained cement was collected and the net weight was
determined. All specimens were visually examined from all sides under 30X magnification using Stereomicroscope (SZ-11,
Results: The tissue level implant following the tack cure protocol had less retained excess cement percentage than the occlusal
vent protocol. Statistically comparison showed a significant difference in the retained excess cement percentage within the tissue
level subgroups (p=0.018), no statistically significant difference was observed within the bone level sub-groups techniques
(p=0.096). There was statistically significant difference between non-vented tack cure and occlusal vent techniques regardless
of the implant type (P=0.004), with more retained excess cement percentage with the vent technique. No statistically significant
difference between tissue level and bone level implants regardless of the cementation technique, with more retained excess
cement percentage in the bone level implants. Our result also showed complete seat of the prosthetic core on the abutments
with 1 mm vent hole that sealed the margins properly. Again stereomicroscope showed seepage of the cement around the
micro thread at the bone level implants.
Conclusions: Tack curing of excess resin cement during the cementation of implant-supported restorations might reduce the
cement residue, but still couldn???t remove the problems of excess resin cement around dental implants. Implants inserted at the
bone level might need extra precautions to avoid the problem of retained excess cement that may affect implant.
Diana Mohamed Abdelazeem Abduallah, an assistant lecturer of Operative Dentistry in the Department of Conservative Dentistry. She has obtained bachelor degree in 2011 followed by masters degree in 2018 from Alexandria University. She is a member of American Academy of Cosmetic Dentistry.