Mechanical Comparison of Experimental Conical-Head Abutment Screws with Conventional Flat-Head Abutment Screws for External-Hex and Internal Tri-Channel Implant Connections: An In Vitro Evaluation of Loosening Torque

Coppedê, Abílio Ricciardi; Faria, Adriana Cláudia Lapria; Mattos, Maria da Glória Chiarello de; Rodrigues, Rossana Lott; Shibli, Jamil Awad; Ribeiro, Ricardo Faria

doi:10.11607/jomi.3029

Cited by 33 publications

(25 citation statements)

References 26 publications

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“…However, Tsuge and Hagiwara ( 21 ) set the implants over aluminium with an elastic modulus of 70 GPa, much greater than the elastic modulus of human bone. Coppedê et al ( 22 ), used stainless steel (elastic modulus of 190 to 210 GPa) and other authors placed the implants in metal supports; although, the type of metal used was not specified ( 12 , 18 ).…”

Section: Resultsmentioning

confidence: 99%

“…The sample size ranged between 30 ( 6 , 12 , 19 , 20 ) and 64 implants ( 21 ). The type of connections used were universal hexagon for the external connection, and the internal octagon ( 9 , 20 , 23 ), hexagon ( 6 , 18 , 20 , 23 ), or morse taper ( 6 , 12 , 20 , 22 , 24 ), or a combination of morse taper with an antirotational hexagon ( 18 ), for internal connection.…”

Section: Resultsmentioning

confidence: 99%

“…Regarding the screw material, the majority of the works used titanium alloys coated with or without tungsten carbide ( 6 , 12 , 18 , 20 , 22 , 24 , 25 ), or with gold. Another study compared these two types of coating ( 20 ).…”

Section: Resultsmentioning

confidence: 99%

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Preload loss of abutment screws after dynamic fatigue in single implant-supported restorations. A systematic review

Pardal-Peláez¹,

Montero²

2017

J Clin Exp Dent

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BackgroundTo carry out a systematic literature review of the causes of preload loss of the abutment screws, of internal and external connection implants, tightened to different torque values and subjected to cyclic loading.Material and MethodsA systematic search was conducted in PubMed, EMBASE, and Cochrane Library databases with reference to in vitro studies in which internal and external connection implants were subjected to cyclic loads to determine the degree of loosening of the abutment screws after loading.ResultsThe reviewed studies tested distinct implant connections (mostly externally hexed, and morse taper) subjected to diverse cycles (from 16667 to 1 million), with loads ranging from 0-400 Nw, using screws of different materials and designs that were tightened into torques between 20-45 Ncm, Accordingly after loading the percentage of torque loss ranges between 16.1% to 39%.ConclusionsMost of the studies indicate that the internal connection, together with the morse taper, best resists cyclic loading in terms of screw loosening in single-tooth implants. Key words:Dental Implants, Dental Implant-Abutment Design, Torque, In Vitro Techniques, Systematic Review.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Preload loss of abutment screws after dynamic fatigue in single implant-supported restorations. A systematic review

Pardal-Peláez¹,

Montero²

2017

J Clin Exp Dent

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“…Pinhata et al 2013reported a mean torque loss of 36% and 40.85% for the control and test groups, respectively. Similarly, Ricciardi et al 2013 found the mean values of 32% forthe control group and 37.2% for the test group.Also, Seol et al (2015) reported a mean torque loss of 48% for test group.Based on the results of our study, in the control groups, one-piece abutments showed signifi cantly higher removal torque value than two-pieceabutments. When opening onepiece abutments, the retention caused by the tapered part of the abutment as well as retention caused by the threads should be overcome.…”

Section: Resultsmentioning

confidence: 65%

“…Pinhata et al reported the mean torque loss values of 18.35% for the control group and 15% for the test group, Pintinha et al (2013). This value was between 15 and 20% in the study by Norton et al and between 10.5 and 5.4% in the study by Ricciardi et al (2013). A mean torque reduction of 8% by Cehreli et al (2004) and 25% by Seol et al (2015) has been reported in test groups.…”

Section: Resultsmentioning

confidence: 76%

Effect of dynamic loading on removal torque value of one-piece and two-piece abutments

Firouz¹,

Heidari²,

Alijani³

et al. 2017

Biosci. Biotech. Res. Comm

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The aim of this study was to assess the effect of dynamic loading and abutment type on removal torque value. Thirty-two analogs of fi xtures with internal taper connections were divided into two groups of 16. The one-piece (OP) group received solid (one-piece) abutments and the two-piece (TP) group received two-piece abutments. Each group was further subdivided into subgroups C (control) without mechanical loading and T (test) with mechanical loading. The screw of abutments in OPC and TPC groups, were tighten and then removed to record the removal torque value (RTV). In OPT and TPT groups, abutments were tighten, mechanically loaded (300,000 cycles), removed, and the RTV were recorded. Two-way ANOVA and Tukey's HSD post-hoc testwere used for data analysis.The signifi cance threshold was set at 0.05. The mean torque loss of OPC group was signifi cantly lower than both TPC and OPT groups (P < 0.05). But there was not signifi cant different in torque lossvalues between abutments in TPC and TPT groups.Under mechanical loading, theremoval torque of both one-piece and two-piece groups decreased and this reduction was only signifi cant for one-piece group. Also, the abutment type has signifi cant effect on removal torque value.

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Wear resistance of a pressable low-fusing ceramic opposed by dental alloys

Faria

Oliveira

Gomes

et al. 2014

Journal of the Mechanical Behavior of Biomedical Materials

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Mechanical Comparison of Experimental Conical-Head Abutment Screws with Conventional Flat-Head Abutment Screws for External-Hex and Internal Tri-Channel Implant Connections: An In Vitro Evaluation of Loosening Torque

Cited by 33 publications

References 26 publications

Preload loss of abutment screws after dynamic fatigue in single implant-supported restorations. A systematic review

Preload loss of abutment screws after dynamic fatigue in single implant-supported restorations. A systematic review

Effect of dynamic loading on removal torque value of one-piece and two-piece abutments

Wear resistance of a pressable low-fusing ceramic opposed by dental alloys

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