In vitro effect of chlorhexidine gel on torque and detorque values of implant 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.

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Evaluation of implant abutment screw tightening protocols on reverse tightening values: An in vitro study

Journal of Prosthetic Dentistry ◽

10.1016/j.prosdent.2020.02.035 ◽

2020 ◽

Author(s):

Abdullah H. Alnasser ◽

Chandur P.K. Wadhwani ◽

Todd R. Schoenbaum ◽

Mathew T. Kattadiyil

Keyword(s):

In Vitro Study ◽

Vitro Study ◽

Implant Abutment ◽

Abutment Screw

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Effect of lubricant on the reliability of dental implant abutment screw joint: An in vitro laboratory and three-dimension finite element analysis

Materials Science and Engineering C ◽

10.1016/j.msec.2016.11.041 ◽

2017 ◽

Vol 75 ◽

pp. 297-304 ◽

Cited By ~ 12

Author(s):

Tingting Wu ◽

Hongyi Fan ◽

Ruiyang Ma ◽

Hongyu Chen ◽

Zhi Li ◽

...

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Dental Implant ◽

Three Dimension ◽

Element Analysis ◽

Implant Abutment ◽

Screw Joint ◽

Dental Implant Abutment ◽

Abutment Screw

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Comparative effect of implant-abutment connections, abutment angulations, and screw lengths on preloaded abutment screw using three-dimensional finite element analysis: An in vitro study

The Journal of Indian Prosthodontic Society ◽

10.4103/jips.jips_219_17 ◽

2018 ◽

Vol 18 (2) ◽

pp. 161 ◽

Cited By ~ 1

Author(s):

DileepNag Vinnakota ◽

KrishnaChaitanya Kanneganti ◽

SrinivasRao Pottem ◽

Mahesh Pulagam

Keyword(s):

Finite Element Analysis ◽

Three Dimensional ◽

In Vitro Study ◽

Comparative Effect ◽

Element Analysis ◽

Implant Abutment ◽

Dimensional Finite Element ◽

Three Dimensional Finite Element ◽

Abutment Screw

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Effect of Application of a Bio-Adhesive on the Removal Torque Value and Rotational Misfit at the Implant–Abutment Junction: An In Vitro Study

Materials ◽

10.3390/ma14226832 ◽

2021 ◽

Vol 14 (22) ◽

pp. 6832

Author(s):

Mahnaz Arshad ◽

Sina Khayat Zadeh ◽

Mohammad Atai ◽

Gholamreza Shirani ◽

Georgios E. Romanos ◽

...

Keyword(s):

In Vitro Study ◽

Vitro Study ◽

Control Group ◽

Removal Torque ◽

Cell Vitality ◽

Implant Abutment ◽

Measuring Machine ◽

Adhesive Application ◽

Abutment Screw

The aim of this study was to assess the effect of application of a recently developed bio-adhesive (Impladhesive) to abutment screw threads on the removal torque value and rotational misfit at the implant–abutment junction. This in vitro study evaluated 20 implant fixtures and 20 straight abutments. Specimens were randomly divided into two groups (n = 10) with/without adhesive application. In the adhesive group, the abutment was dipped in Impladhesive before torquing. In the control group, the abutment was torqued conventionally without adhesive application. The removal torque value was recorded after completion of the cyclic loading of 500,000 cycles with 2 Hz frequency and 75 N load. Rotational misfit was recorded using a video measuring machine. After applying the torque, the change in the bisector angle on the abutment hex was recorded for each implant. The biocompatibility of Impladhesive was evaluated using a MTT cell vitality assay. Normal distribution of data was assessed using the Kolmogorov–Smirnov test. Data were analyzed using a t-test and Pearson’s correlation coefficient The application of Impladhesive at the implant–abutment interface resulted in significantly greater mean removal torque value compared to the control group (p = 0.008). In addition, the mean rotational misfit at the implant–abutment interface was significantly lower in the use of Impladhesive compared to the control group (p = 0.001). In addition, the cell vitality was found to be greater than 80% at all evaluated time points. It can be concluded that the application of Impladhesive on the abutment screw significantly decreased rotational misfit and increased the removal torque value. Future studies are needed to evaluate the efficacy of this bio-adhesive an in vivo setting.

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Efficacy of Various Implant Abutment Screw Access Channel Sealing Materials in Preventing Microleakage: A Systematic Review

Journal of Oral Implantology ◽

10.1563/aaid-joi-d-21-00085 ◽

2021 ◽

Author(s):

Saurabh Jain

Keyword(s):

Systematic Review ◽

English Literature ◽

In Vitro Studies ◽

Sealing Capacity ◽

Access Channel ◽

Implant Abutment ◽

Materials Used ◽

Meta Analyses ◽

Abutment Screw

The aim of this systematic review is to evaluate the effectiveness of different materials used for sealing dental implant abutment screw access channel (ASAC), in preventing microleakage. As per the searched indexed English literature, this study is the first review of its kind. Indexed English literature published up to 20 th February 2021 was systematically searched on relevant electronic data bases. The recommendations specified by the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) were applied for constructing framework, and reporting the current review. The focused PICO question was: “Which material (C) is more effective in sealing (I) implant ASAC (P) in terms of causing minimal microbial leakage (O)”. Quality of articles was assessed with modified CONSORT scale for in vitro studies. Five in vitro studies were selected for qualitative analysis after final stage screening. Modified CONSORT scale suggested that out of the five selected studies, one each was of low and high quality, whereas three studies were of moderate quality. Included studies had contrasting results related to the efficacy these materials as sealants in ASAC. Sealing capacity against microleakage should be considered as one of the important criteria while selecting the material to fill implant ASAC. Definitive conclusions asserting superiority of a single material over others are difficult to draw, due to non-homogeneity in study design of the included papers. More studies should be conducted in the near future to investigate the efficacy of various combination of materials in preventing micro leakage.

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Evaluation of the Sealing Capability of the Internal Conical Connections of Implants with Titanium and Zirconia Abutments

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-2149 ◽

2017 ◽

Vol 18 (10) ◽

pp. 915-922 ◽

Cited By ~ 2

Author(s):

Ilser Turkyilmaz ◽

Damian L Black ◽

Chol H Chong

Keyword(s):

P Value ◽

Colony Forming Units ◽

Significant Difference ◽

Implant Abutment ◽

Level Of Significance ◽

Torque Values ◽

Post Hoc ◽

Positive Controls ◽

Abutment Screw

ABSTRACT Aim The purpose of this in vitro investigation was to evaluate the sealing capability of the conical implant–abutment interfaces under different abutment screw torque values using titanium and zirconia abutments with Morse taper designs. Materials and methods A total of 42 dental implants (n = 21 for titanium abutments and n = 21 for zirconia abutments) were inoculated internally with three bacteria. These assemblies were divided into four test groups (n = 10) based on screw fixation torques of 35 or 20 Ncm and placed in sterile broth; the remaining abutments were used as positive controls and torqued to 10 Ncm. Microleakage was quantified by enumerating the bacteria from the colony-forming units. An analysis of variance for the estimates of bacteria enumerated and microgaps was used with a post hoc analysis as indicated. A p-value of 0.05 was used as the level of significance. Results There was no statistically significant difference in microleakage among the four test groups; there were no significant effects of screw torque or abutment type on the bacteria enumerated. There was a significantly smaller mean microgap with the zirconia abutments. Conclusion The results of this study indicated no statistically significant difference in the sealing capabilities between titanium and zirconia abutments, having internal conical connections, after increasing the abutment screw torque. Clinical significance It is important for clinicians to follow the guidelines suggested by the implant companies to avoid biomechanical complications over time. How to cite this article Black DL, Turkyilmaz I, Lien W, Chong CH. Evaluation of the Sealing Capability of the Internal Conical Connections of Implants with Titanium and Zirconia Abutments. J Contemp Dent Pract 2017;18(10):915-922.

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