In vitro comparison of primary stability of two implant designs in D3 bone

Abstract

Background: Primary stability (PS) is a key factor for implant survival rate and depends on implant design or bone quality. The aim of this study was to compare different thread designs implants, evaluating PS with periotest values (PV) and implant stability quotient (ISQ) values through resonance frequency analysis (RFA). Material and Methods: A total of 60 implants (Radhex®, Inmet-Garnick S.A., Guadalajara, Spain) were placed in freshly bovine ribs in vitro. Two designs were used: 30 tapered body with single thread design (PHI) and 30 tapered body with double thread design implants (PHIA). Both designs were 4mm wide and 12mm long. Implants were placed according to manufacturer's guidelines. Osstell™ and Periotest® devices were used to evaluate PS by a blinded independent observer. Computed tomographies (CTs) of the ribs were made (BrightSpeed Series CT systems, GE Healthcare, Milwaukee, WI, USA) and bone quality surrounding each implant was evaluated in Hounsfield Units (HU) using Ez3D Plus software (Vatech Co., Korea). Bone quality was classified according to Misch and Kircos in D1, D2, D3 or D4. Results: All implants were mechanically stable. Only implants placed in D3 bone (350-850 HU) were selected for the study: 28 PHI and 26 PHIA. The one way ANOVA showed significant difference (p < 0.005) among two implants designs in ISQ values (61,55 ± 6,67 in PHI and 68,94 ± 5,82 in PHIA). No significant difference (p = 0,171) was shown in PV between two designs 47 ± 1,77 ± 0,87 in PHIA). Conclusions: Higher PS was found using Osstell™ device in implants with double thread design (PHIA) in comparison to implants with single thread design (PHI) in D3 bone.

The influence of implant design on implant stability in low‐density bone under guided surgical template in inexperienced surgeons: A pilot randomized controlled clinical trial using resonance frequency analysis

“…Coinciding with this result, many clinical studies also reported tapered shaped implants achieving higher ISQ values than cylindrical implants 16,19,20 . Concerning thread design, implants with more threads, deep threads, and micro‐thread designs were shown to positively influence the implant stability 8,21 . A split‐mouth clinical study by Gehrke and colleagues 22 also observed greater implant stability in tapered implants with wide pitch compared with cylindrical implants with narrow pitch.…”

“…16,19,20 Concerning thread design, implants with more threads, deep threads, and micro-thread designs were shown to positively influence the implant stability. 8,21 A split-mouth clinical study by Gehrke and colleagues 22 also observed greater implant stability in tapered implants with wide pitch compared with cylindrical implants with narrow pitch. The reason why our result differs from the mentioned studies may be that TS/DT group had a higher number of female patient participants (10), while the CS/ST group had seven females.…”

Does hyperbaric oxygen therapy pressure reduce mechanical stability of implants?

“…For optimizing standardization, bone simulation blocks were used [ 17 , 18 ]. Also, there are cadaver and animal studies for primary stability evaluations in the literature [ 19 , 20 ]. Implant site preparation directly affects the mechanical implant stability [ 21 ].…”

Influence of short implants geometry on primary stability

“…In the present study, as bone tissue does not display homogenous density, bovine bone was preferred instead of polyurethane blocks that show homogeneous density ( 17 ). Nonetheless, it was therefore necessary to assess the bone quality in HU as already described ( 18 , 19 ).…”