Additively manufactured implant abutment screw-access guide to remove a cement-retained implant crown: A technique

2021 ◽  
Author(s):  
Marta Revilla-León ◽  
Delaram Seyedeh Abaei ◽  
Adam Tittle ◽  
Amirali Zandinejad
Keyword(s):  
Implant Abutment ◽  
Implant Crown ◽  
Abutment Screw

scholarly journals In vitro effect of chlorhexidine gel on torque and detorque values of implant abutment screw

2017 ◽  
Vol 28 (3) ◽  
pp. 314
Author(s):  
BardiaVadiati Saberi ◽  
HamidNeshandar Asli ◽  
ArezooSadat Fatemi
Keyword(s):  
Implant Abutment ◽  
Vitro Effect ◽  
Chlorhexidine Gel ◽  
Abutment Screw

scholarly journals The Evolution of External and Internal Implant–Abutment Connections: A Review

2012 ◽  
Vol 2 (2) ◽  
pp. 37
Author(s):  
D.R. Prithviraj ◽  
Ninad Muley ◽  
Vikas Gupta
Keyword(s):  
Native Speakers ◽  
Screw Loosening ◽  
Implant Abutment ◽  
Primary Determinant ◽  
Native Speakers Of English ◽  
Over Time ◽  
Abutment Screw

A study of the implant–abutment connection is of great importance because it is the primary determinant of the strength and stability of an implant-supported restoration, which, in turn, determines the restoration’s prosthetic stability. Traditionally, Brånemark’s external hexagon has been used, but significant complications, such as abutment screw loosening, rotational misfit at the implant–abutment interface, and microbial penetration have led to modification of the external hexagon and the development of internal implant–abutment connections. In this review, we describe various implant–abutment connections that have evolved over time from the traditional external hexagon.  How to cite this article: Alharissy M, Dayoub S. The Evolution of External and Internal Implant–Abutment Connections: A Review. Int Dent Res 2012;2:37-42. Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

scholarly journals In Vitro Evaluation of Manual Torque Values Applied to Implant-Abutment Complex by Different Clinicians and Abutment Screw Loosening

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Onur Dincer Kose ◽  
Burcin Karataslı ◽  
Sabit Demircan ◽  
Taha Emre Kose ◽  
Erhan Cene ◽  
...  
Keyword(s):  
Dynamic Loading ◽  
Optical Microscope ◽  
Control Group ◽  
Screw Loosening ◽  
Loading Test ◽  
Torque Wrench ◽  
Implant Abutment ◽  
Torque Values ◽  
Abutment Screw

Preload is applied to screws manually or using a torque wrench in dental implant systems, and the preload applied must be appropriate for the purpose. The aim of this study was to assess screw loosening and bending/torsional moments applied by clinicians of various specialties following application of manual tightening torque to combinations of implants and abutments. Ten-millimeter implants of 3.7 and 4.1 mm diameters and standard or solid abutments were used. Each group contained five implant-abutment combinations. The control and experimental groups comprised 20 and 160 specimens, respectively. Implants in the experimental group were tightened by dentists of different specialties. Torsional and bending moments during tightening were measured using a strain gauge. Control group and implants with preload values close to the ideal preload were subjected to a dynamic loading test at 150 N, 15 Hz, and 85,000 cycles. The implants that deformed in this test were examined using an optical microscope to assess deformities. Manual tightening did not yield the manufacturer-recommended preload values. Dynamic loading testing suggested early screw loosening/fracture in samples with insufficient preload.

scholarly journals An Indirect Method to Measure Abutment Screw Preload: A Pilot Study Based on Micro-CT Scanning

2015 ◽  
Vol 26 (6) ◽  
pp. 596-601 ◽  
Author(s):  
Carlos Eduardo E. Rezende ◽  
Jason Alan Griggs ◽  
Yuanyuan Duan ◽  
Amanda M. Mushashe ◽  
Gisele Maria Correr Nolasco ◽  
...  
Keyword(s):  
Ct Scanning ◽  
Measuring Method ◽  
Micro Ct ◽  
Ct Scanner ◽  
Removal Torque ◽  
Ct Technique ◽  
Original Length ◽  
Implant Abutment ◽  
Torque Values ◽  
Abutment Screw

This study aimed to measure the preload in different implant platform geometries based on micro-CT images. External hexagon (EH) implants and Morse Tapered (MT) implants (n=5) were used for the preload measurement. The abutment screws were scanned in micro-CT to obtain their virtual models, which were used to record their initial length. The abutments were screwed on the implant with a 20 Ncm torque and the set composed by implant, abutment screw and abutment were taken to the micro-CT scanner to obtain virtual slices of the specimens. These slices allowed the measurement of screw lengths after torque application and based on the screw elongation. Preload values were calculated using the Hooke's Law. The preloads of both groups were compared by independent t-test. Removal torque of each specimen was recorded. To evaluate the accuracy of the micro-CT technique, three rods with known lengths were scanned and the length of their virtual model was measured and compared with the original length. One rod was scanned four times to evaluate the measuring method variation. There was no difference between groups for preload (EH = 461.6 N and MT = 477.4 N), but the EH group showed higher removal torque values (13.8±4.7 against 8.2±3.6 Ncm for MT group). The micro-CT technique showed a variability of 0.053% and repeatability showed an error of 0.23 to 0.28%. Within the limitations of this study, there was no difference between external hexagon and Morse taper for preload. The method using micro-CT may be considered for preload calculation.

scholarly journals PRECISION OF PRODUCTION CROWN MANUFACTURING USING 3D-PRINTING TECHNOLOGY. IMMEDIATE TEMPORARY RESTORATION AFTER DENTAL IMPLANTATION

2021 ◽  
Vol 16 (4) ◽  
pp. 109-114
Author(s):  
Yuri Melnikov ◽  
Sergey Zholudev ◽  
Elena Vladimirova ◽  
Dmitry Zaikin
Keyword(s):  
Electron Microscopy ◽  
3D Printing ◽  
Three Dimensional ◽  
Internal Surface ◽  
Implant Placement ◽  
Dental Implantation ◽  
Implant Abutment ◽  
Implant Crown ◽  
Simultaneous Loading ◽  
Microscopy Data

Subject. Currently, tooth loss prosthetics using implants are widely used. An important problem is the loss of bone tissue due to infections around the implant. Micro-gaps at the implant-abutment interface can contribute to infection with microorganisms.The aim of this study was to investigate the precision of connecting the implant-abutment components with simultaneous loading and temporary restoration. Methodology. The precision of the "implant – abutment – artificial crown" connection was studied on a clinical case with simultaneous removal of a tooth root, followed by implant placement and temporary restoration. Before installing the implant, specialized programs combined a three-dimensional CT model of the jaw with a 3D model of the dentition obtained as a result of scanning. To study precision, a duplicate plastic crown was made according to this virtual plan and fixed in a similar implant. The "implant-crown" model was fixed in plaster and a section was made up to the level of the "implant-abutment-artificial crown" connection, which was studied using electron microscopy at magnification of 50, 100 and 200 times. Results. Electron microscopy data showed that the junction of the internal surface of the implant with the plastic "abutment" had a gap width in the range of 54-77 microns. Conclusion. The exact fit of the restoration on the implant was confirmed by electron microscopy. In the presented example, due to the production of temporary restoration, it was possible to reduce the number of manipulations with the implant-abutment components. Modern milling and 3D printing technologies show high precision.

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