Strength of titanium-zirconium alloy implants with a conical connection after implantoplasty

Sweety D Shah; Fengyuan Zheng; Robert R Seghi; Damian J Lee

doi:10.1016/j.prosdent.2022.08.015

Strength of titanium-zirconium alloy implants with a conical connection after implantoplasty

J Prosthet Dent. 2022 Sep 20:S0022-3913(22)00511-X. doi: 10.1016/j.prosdent.2022.08.015. Online ahead of print.

Authors

Sweety D Shah¹, Fengyuan Zheng², Robert R Seghi³, Damian J Lee⁴

Affiliations

¹ Former Resident, Advanced Prosthodontics Program, Division of Restorative and Prosthetic Dentistry, The Ohio State University College of Dentistry, Columbus, Ohio; Private practice, Charlotte, NC.
² Associate Clinical Professor and Director, Advanced Education in Prosthodontics Program, Department of Restorative Sciences, Division of Prosthodontics, University of Minnesota School of Dentistry; Minneapolis, Minn.
³ Professor Emeritus, Division of Restorative and Prosthetic Dentistry, The Ohio State University College of Dentistry, Columbus, Ohio.
⁴ Associate Professor and Director, Advanced Prosthodontics Program, Division of Restorative and Prosthetic Dentistry, The Ohio State University College of Dentistry, Columbus, Ohio. Electronic address: Lee.6221@osu.edu.

PMID: 36150928
DOI: 10.1016/j.prosdent.2022.08.015

Abstract

Statement of problem: Peri-implantitis occurs around dental implants, and implantoplasty has been used to address this ongoing disease; however, the changes to the physical properties of an implant after implantoplasty have not been well documented.

Purpose: The purpose of this in vitro study was to determine the effect of implantoplasty on fracture strength and the load required for plastic deformation after cyclic fatigue on dental implants.

Material and methods: Twenty-six titanium/zirconium (TiZr) alloy implants (Roxolid Bone Level Implant; 4.1×10 mm) were embedded with 50% thread exposure and divided into 4 groups based on whether they had implantoplasty treatment by using different diamond rotary instruments and/or cyclic loading at 250 N for 2 million cycles: C0 (control, no cyclic loading), T0 (test, no cyclic loading), CM (control, cyclic loading), and TM (test, cyclic loading). After implantoplasty and/or cyclic loading, all implants underwent a load-to-failure test. The maximum fracture strength (FS) and load required for the onset of plastic deformation (PD) were recorded in Newtons. One-way ANOVA and nonparametric comparisons with control by using the Dunn and Wilcoxon method for joint ranking were used for statistical analysis.

Results: The mean ±standard deviation FS for C0, CM, T0, and TM was 1465.2 ±86.4 N, 1480.7 ±64.1 N, 1299.3 ±123.8 N, and 1252.1 ±85.7 N, respectively. The mean ±standard deviation load for onset of PD for C0, CM, T0, and TM was 860.2 ±88.1 N, 797.0 ±130.5 N, 776.5 ±181.8 N, and 631.3 ±84.5 N, respectively. The TM group had a significantly lower FS and PD than the C0, CM, and T0 groups (P<.05) CONCLUSIONS: Both fracture strength (FS) and the onset of plastic deformation (PD) were significantly reduced after a TiZr alloy implant received implantoplasty and cyclic loading.