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Aims: The aim of the current study is to compare the impact of using different drilling protocols on the dental implants primary stability inserted in the low-density bones. Materials and Methods: Out of twenty-two, ten oxen ribs were used in this in-vitro study. Using computed tomography (CT) scan, the most proximal three centimeters (cm) of the rib was confirmed to be a low-density bone comparable to human edentulous jaw bones. Forty dental implants were inserted, each rib received four dental implants using four different techniques that are arranged into four study groups:Group (I): includes a number of ten dental implants where the drilling burs and implants have the same size. Fit-size technique (F.G).Group (II): includes a number of ten dental implants where the diameter of the drilling burs is less than the implant diameter. Under-sized technique (U.G) Group (III): includes a number of ten dental implants where the simplified drilling protocol (Drill bypass) (D.G) was used for insertion.Group (IV): includes a number of ten dental implants where combined drilling protocols (C.G) (Undersized U.G+ Drill bypass D.G) were used for insertion. Results: Results revealed a statistically significant difference in the mean of insertion torque values (IT) between combined group (C.G) (65.000 N.cm) and fit-sized group (F.G) (45.0000 N.cm).Concerning Periotest M, a statistically significant difference was found in the mean of (PTV) between combined group (C.G) (-6.4500) and fit-sized group. A statistically highly significant correlation was found between insertion torque values (ITs) and Periotest M values (PTVs). Conclusions: Dental implant insertion in low-density bones using simplified drilling protocol (Drill bypass) (D.G) is better to be combined with undersized implant bed preparation (U.G) to enhance The Effects of Combining Drill Diameters Bypass, and Implant Bed under Preparation Protocols on Primary Stability of Dental Implant in LowDensity Bones (Experimental Study) ISSN: 1812–1217 EISSN: 1998-0345 Al – Rafidain Dent J Vol. 20, No1, 2020 135 implant primary stability and with less time.

al-rafidain dental journal/maǧallaẗ al-rāfidayn li-ṭibb al-asnān

The Effects of Combining Drill Diameters Bypass, and Implant Bed under Preparation Protocols on Primary Stability of Dental Implant in Low-Density Bones (Experimental Study)