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Journal of Oral Science & Rehabilitation Volume 2 | Issue 1/2016 53 in vitro study compared the primary stability of implant designs with symmetric or progressive threads in soft and hard bone placed byclinicians with different levels of surgical experience. There is great variability in the definition of level of experience used in previous studies. Lambert et al. regarded an experienced clinician as one who had placed more than 50 implants and an inexperienced one as having placedfewer than 50 implants.13 PreiskelandTsolka consider ed experienced clinicians those periodontists and oral and maxillofacial surgeons with more than two years of experience with dental im- plants and they considered as inexperienced those oral and maxillofacial surgeons just be- ginning their involvement in dental implants.16 Hinckfuss et al. classified level of experience as novice (dental students with no clinical surgical implant experience who had completed an in structionallaboratorycourse in placing implants intypodonts), intermediate (graduate periodon- tology residents who had placed between 20 and 80 implants clinically) and experienced (periodontists who had placed over 300 im- plants clinically).17 The present experimental study assigned to the surgeonstwo levels ofexperience: expert (25 years’ experience in implant dentistry and more than 10,000 implants placed) and intermediate (15 years’ experience in implant dentistry and fewer than 5,000 implants placed). Compared with other studies, this is one of the strictest measurements ofclinician experience.The ratio nale is based on a study in psychology that de- monstrated that level of experience is deter- mined, among others, bylearning (skills acquired through repetition) and performance (quality of the procedures that is dependent on the perfor- mer);18 therefore,itcanbeassertedthatthenum- ber of years of experience and the number of proceduresperformedusedinthepresentexper iment are reasonable. The results of the present work showed that the effects of the thread design were beneficial for primary stability, especially in the soft bone, as measured by ISQ value and that there was no Fig. 4 Implant insertion level for the evaluation of the IT and the ISQ values. The implants were placed with the most coronal portion of the platform flush with the block surface. 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 Fig. 4 Volume 2 | Issue 1/201653