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Journal of Oral Science & Rehabilitation 48 Volume 2 | Issue 1/2016 F a c t o r s a f f e c t i n g p r i m a r y s t a b i l i t y o f t a p e r e d i m p l a n t s w i t h d i f f e r e n t t h r e a d d e s i g n Primary stability of dental implants with different thread geometries placed by clinicians with different clinical experience: An in vitro study Rafael Arcesio Delgado Ruiz,* José Luis Calvo Guirado,† José Eduardo Maté Sánchez de Val,† Gerardo Gómez Moreno,‡ Fawad Javed§ & Georgios Romanos* * School of Dental Medicine, Stony Brook University, N.Y., U.S. † International Dentistry Research Cathedra, Universidad Católica San Antonio de Murcia, Murcia, Spain ‡ Faculty of Medicine and Dentistry, University of Granada, Granada, Spain § School of Medicine and Dentistry, University of Rochester, N.Y., U.S. C o r r e s p o n d i n g a u t h o r : Prof. Rafael Arcesio Delgado Ruiz School of Dental Medicine 11 Westchester Hall Stony Brook NY 11794-8712 USA T +1 631 786 1839 F +1 631 631 6931 rafael.delgado-ruiz@stonybrookmedicine.edu H o w t o c i t e t h i s a r t i c l e : Delgado Ruiz RA, Calvo Guirado JL, Maté Sánchez de Val JE, Gómez Moreno G, Javed F, Romanos G. Primary stability of dental implants with different thread geometries placed by clinicians with different clinical experience: an in vitro study. J Oral Science Rehabilitation. 2016 Mar;2(1):48–55. Abstract O b j e c t i v e Theobjectiveofthisstudywastoestablishtheprimarystabilityofimplants with two different designs placed into artificial bone (Type II and Type IV density) by clinicians with different levels of experience using the same implant bed preparation protocol. M a t e r i a l s a n d m e t h o d s Aninvitroexperimentwasperformedusingpolyurethaneresinboneblocks resemblingType IVandType II bone density. Eightycontrol implants (Re- place Select Tapered with symmetric threads, Nobel Biocare) and 80 test implants (NobelActive, tapered with progressive threads, Nobel Biocare) were placed. The implant diameter was 4.3 mm and the length was 11.5 mm for both groups. Implant beds were prepared by two clinicians with different levels of experience (expert and intermediate), and subse- quentlyimplantswere placedwiththe platforms at crestal level.The sta- bility parameters of insertion torque and implant stability quotient were recordedwhentheimplantsreachedtheinsertiondepth.Atwo-wayANO- VAwas used to evaluate differences within the groups; multiple compar- isonswereperformedusingtheTukeytest.Significancewassetatp<0.05. R e s u l t s Stability parameters were significantly higher for Type II bone for both clinicianscomparedwithTypeIVbone(p<0.05).Implantswithaprogres- sivethreaddesignshowedatendencytoincreasedstabilitycomparedwith implants with a symmetric thread design in Type IV bone (p < 0.05). The clinicians’levelofexperiencedidnotaffecttheimplantstability(p>0.05). C o n c l u s i o n Withinthelimitationsofthisinvitrostudy,thefollowingconclusionswere drawn: - Theclinician’slevelofexperiencedoesnotaffecttheimplantstabilityinType IVandTypeIIbonewhenthesameimplantbedpreparationprotocolisused. - Thestabilityoftaperedimplantswithsymmetricthreadsandthosewith progressive threads is increased in Type II bone density. - Theimplantstabilityinsoftboneissimilarfortaperedimplantswithasym- metricthread design andforthosewith a progressivethread design. K e y w o r d s Implantdesign,implantstability,softbone,hardbone,levelofexperience. T +16317861839 F +16316316931