Influence of Different Maintenance Times of Torque Application on the Removal Torque Values to Loosen the Prosthetic Abutment Screws of External Hexagon Implants

Sella, Gustavo Castellazzi; Neto, Armando Rodrigues Lopes Pereira; Volpato, Cláudıa Ângela Mazıero; Vasconcellos, Diego Klee de; Pekkan, Gürel; Özcan, Mutlu

doi:10.1097/id.0b013e31829e548d

Cited by 6 publications

(9 citation statements)

References 22 publications

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“…The studyindicated that 20 second maintenance time is the preferred option when considering greater detorque values compared to the instant torque application; however, de-torque value after 30 second torque maintenance time was higher than that of 20 seconds but not significantly different 13. The studyindicated that 20 second maintenance time is the preferred option when considering greater detorque values compared to the instant torque application; however, de-torque value after 30 second torque maintenance time was higher than that of 20 seconds but not significantly different 13.…”

mentioning

confidence: 78%

“…12 Moreover, 20 seconds maintenance time of torque application was found to increase the removal torque value and decrease the screw loosening by reducing the settling effect between the threads of single dental implants. 12,13 However, the effect of different maintenance time of torque application and screw loosening in full-arch implant-supported prosthesis remains uninvestigated. 12,13 However, the effect of different maintenance time of torque application and screw loosening in full-arch implant-supported prosthesis remains uninvestigated.…”

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confidence: 99%

“…13 These findings were investigated in single implantsupported restorations. 12,13 However, the effect of different maintenance time of torque application and screw loosening in full-arch implant-supported prosthesis remains uninvestigated. Therefore, the aim of this in vitro analysis was to evaluate the effect of different maintenance time of torque application on detorque values of implant abutment screw in full-arch implant-supported fixed complete denture.…”

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confidence: 99%

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Effect of different maintenance time of torque application on detorque values of abutment screws in full‐arch implant‐supported fixed prostheses

Al-Otaibi

Alfouzan

Al-Mufleh

et al. 2018

Clin Implant Dent Rel Res

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The application of 35 N-cm for different maintenance time of torque application on implant abutment screw did not appear to affect the detorque value in a multiple implant-supported fixed prosthesis. Maintaining the torque for prolonged time (10 seconds or 30 seconds) was not significantly associated with higher preload than instant torque application in full-arch implant-supported prosthesis.

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confidence: 78%

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confidence: 99%

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confidence: 99%

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Effect of different maintenance time of torque application on detorque values of abutment screws in full‐arch implant‐supported fixed prostheses

Al-Otaibi

Alfouzan

Al-Mufleh

et al. 2018

Clin Implant Dent Rel Res

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“…However, the preload should not be too large and should be within the elastic limit to prevent the screw from yielding or breaking. Previous studies have demonstrated that the ideal preload is 60%–75% of the elastic limit of the material used for fabrication of the abutment screw (Kim et al., ; Saboury, Neshandar Asli & Vaziri, ; Sella et al., ). The effect of retightening after applying the initial tightening torque has been evaluated as a method to increase joint stability (Siamos, Winkler & Boberick, ).…”

Section: Introductionmentioning

confidence: 99%

Original vs. non‐original abutments for screw‐retained single implant crowns: An in vitro evaluation of internal fit, mechanical behaviour and screw loosening

Alonso-Pérez

Bartolomé

Ferreiroa

et al. 2018

Clinical Oral Implants Res

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Objectives To assess the internal accuracy, mechanical behaviour under static load and screw loosening before and after cyclic loading of implant‐supported crowns restored with original components or with two compatible non‐original brands. Materials and Methods Sixty‐three dental implants were divided into three groups (n = 21 each): Group 1 used original components, and groups 2 and 3 used non‐original components. Internal accuracy was measured throughout a cross section of the sample groups (n = 8) using scanning electron microscopy (SEM) to evaluate the fit for implant–abutments, implant–crowns and crown–abutments. To evaluate load‐bearing capacity, eight samples from each group were loaded until fracture according to ISO Norm 14801. The removal torque value (RTV) was evaluated in the screws connecting the crown with the abutment and the abutment with the implant before and after cyclic loading (2 x 106 cycles) in five samples from each group. The data were analysed using the Kruskal–Wallis test (p < 0.05). Results Statistically significant differences were found among the mean crown–abutment gaps measured in Group 1 (9.3 μm), Group 2 (45.4 μm) and Group 3 (44.9 μm). Higher values for mean load‐bearing capacity were found in Group 1 (1,098 N) than in groups 2 and 3 (1,057 and 973 N, respectively); however, these differences were not statistically significant. Original abutment–implant screws exhibited lower percentages of torque reduction than the non‐originals. Conclusions Enhanced fit is expected when original components are used. The original abutments exhibited lower percentages of torque reduction after cyclic loading than non‐originals.

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“…The SIFT algorithm has a bias by which it is more likely to assign high functionality to residues within proteins that are conserved only over a short evolutionary distance, but are highly similar within this short time-frame [21]. The Polyphen algorithm has a bias by which its likelihood of assigning functionality to a mutation is higher, if the mutated allele happens to be the allele represented in the human reference genome [25]. Each of these biases may affect the results obtained by any one measure.…”

Section: Introductionmentioning

confidence: 99%

Cancer Evolution Is Associated with Pervasive Positive Selection on Globally Expressed Genes

et al. 2014

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Cancer is an evolutionary process in which cells acquire new transformative, proliferative and metastatic capabilities. A full understanding of cancer requires learning the dynamics of the cancer evolutionary process. We present here a large-scale analysis of the dynamics of this evolutionary process within tumors, with a focus on breast cancer. We show that the cancer evolutionary process differs greatly from organismal (germline) evolution. Organismal evolution is dominated by purifying selection (that removes mutations that are harmful to fitness). In contrast, in the cancer evolutionary process the dominance of purifying selection is much reduced, allowing for a much easier detection of the signals of positive selection (adaptation). We further show that, as a group, genes that are globally expressed across human tissues show a very strong signal of positive selection within tumors. Indeed, known cancer genes are enriched for global expression patterns. Yet, positive selection is prevalent even on globally expressed genes that have not yet been associated with cancer, suggesting that globally expressed genes are enriched for yet undiscovered cancer related functions. We find that the increased positive selection on globally expressed genes within tumors is not due to their expression in the tissue relevant to the cancer. Rather, such increased adaptation is likely due to globally expressed genes being enriched in important housekeeping and essential functions. Thus, our results suggest that tumor adaptation is most often mediated through somatic changes to those genes that are important for the most basic cellular functions. Together, our analysis reveals the uniqueness of the cancer evolutionary process and the particular importance of globally expressed genes in driving cancer initiation and progression.

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Influence of Different Maintenance Times of Torque Application on the Removal Torque Values to Loosen the Prosthetic Abutment Screws of External Hexagon Implants

Cited by 6 publications

References 22 publications

Effect of different maintenance time of torque application on detorque values of abutment screws in full‐arch implant‐supported fixed prostheses

Effect of different maintenance time of torque application on detorque values of abutment screws in full‐arch implant‐supported fixed prostheses

Original vs. non‐original abutments for screw‐retained single implant crowns: An in vitro evaluation of internal fit, mechanical behaviour and screw loosening

Cancer Evolution Is Associated with Pervasive Positive Selection on Globally Expressed Genes

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