Journal of implantology and applied sciences ISSN:2765-7833(Print) 2765-7841(Online) 대한구강악안면임플란트학회지

Purpose : There are few studies of the effect of change in dental implant fixtures on the primary stability of implants even though a number of implant designs have been commercially used. this investigation aims to help in the choice of different dental implant designs that are currently in clinical use, based on the understanding the change of primary stability according to varying implant fixtures by researching how taper and thread number of implants have effects on primary stability characteristics. Materials and Methods : A total of 12 implant fixture samples which were 11.5mm in length and 4mm in diameter were made and each sample had 0, 1, 3, 5 degree in taper and single, double, triple thread in thread number. balsa was used by fixture site model. each implant fixture sample was placed ten times using INTRAsurg 300 plus and peak insertion torque(IT) after placement was measured. resonance frequency analysis(RFA) measurements and removal torque(RT) measurements were also performed. statistical significance was verified by 2-way ANOVA, 1-way ANOVA at the P≤0.05 level and Scheffe′test was performed. Result : IT and RT value significantly increased as the taper increased from 0 degree to 1 degree to 3 degree but decreased in 5 degree taper. there was no significantly difference between 1 degree and 3 degree(0°<5°<1°=3°). also IT and RT value increased as thread number increased from single to double to triple and there was no significantly difference between double and triple(1thread<2thread=3thread). measured RFA values were almost the same in all tested groups independent of body taper and thread number. Conclusion : Higher primary stability was retained in tapered implant body and the thread number more than one.