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. 2022 Feb 1;14(2):e138-e143.
doi: 10.4317/jced.58886. eCollection 2022 Feb.

In vitro evaluation of the influence of bone cortical thickness on the primary stability of conventional- and short-sized implants

Luiz-Antônio-Borelli Barros  1 , Caio-Fossalussa da Silva  2 , Germana-de Villa Camargos  3 , Elcio Marcantonio Jr  4 , Guilherme-José-Pimentel-Lopes de Oliveira  3 , Luiz-Antônio-Borelli Barros-Filho  5
Affiliations

In vitro evaluation of the influence of bone cortical thickness on the primary stability of conventional- and short-sized implants

Luiz-Antônio-Borelli Barros et al. J Clin Exp Dent. .

Abstract

Background: The aim of this in vitro study was to evaluate the influence of the cortical thickness on the primary stability of short and conventional-sized implants with two types of prosthetic connection.

Material and methods: Seventy-two implants were used. These implants were placed in polyurethane blocks that simulated low-density bone tissue (type IV bone), with two bone cortical heights (type I bone): 1mm and 3mm. The implants were divided into 6 groups with 12 implants each according to the type of prosthetic connections (external-hexagon -EH and morse taper- MT) and implant sizes (conventional- 4x10mm and short 5x5mm; 5.5x5mm; 5x6mm; 5.5x6mm). Insertion torque (IT) and resonance frequency analyzes (RFA) were performed to evaluate the primary stability of the implants.

Results: All implants installed in blocks with 3mm of cortical thickness showed greater IT than those installed in 1mm. The short-sized MT implants had a higher IT than conventional implants of the same connection. Short-sized EH implants showed less IT than short-sized MT implants in blocks with 3mm of cortical. In blocks with 1mm of cortical, conventional EH implants had a higher IT compared to short-sized EH implants. The conventional sized implants presented higher RFA values despite the thickness of the cortical in the blocks.

Conclusions: The greater bone cortical thickness and implants size provides greater primary stability of the implants regardless the prosthetic connection. Key words:Implants connection, implants macrostructure, primary stability.

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Conflict of interest statement

Conflicts of interest The authors declares to have no conflicts of interesting.

Figures

Figure 1
Figure 1
The design of the implants placed in this study. A) Conventional-sized implant with EH prosthetic connection; B) Conventional-sized implant with MT prosthetic connection; C) Short-sized implant (5 mm) with EH prosthetic connection; D) Short-sized implant (6 mm) with EH prosthetic connection; E) Short-sized implant (5 mm) with MT prosthetic connection; F) Short-sized implant (6 mm) with MT prosthetic connection. Note that conventional implants, in addition to the differences in platform type, present important differences in the region of the implant neck where the EH type implant has micro-threads and a smooth collar whereas conventional implants with MT connection have a neck without micro-threads with microroughness collar. Short implants have a similar configuration except for the type of prosthetic connection.
Figure 2
Figure 2
A) Specimen with 1mm of cortical thickness; B) Specimen with 3mm of cortical thickness.
See this image and copyright information in PMC

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