Effect of screw-access hole and mechanical cycling on fracture load of 3-unit implant-supported fixed dental prostheses

Fernando Mallmann; Luciano Rosa; Márcia Borba; Alvaro Della Bona

doi:10.1016/j.prosdent.2017.01.016

Effect of screw-access hole and mechanical cycling on fracture load of 3-unit implant-supported fixed dental prostheses

Fernando Mallmann, Luciano Rosa, Márcia Borba, Alvaro Della Bona^*

^*Corresponding author for this work

Division of Dentistry (L5)

University of Passo Fundo

Research output: Contribution to journal › Article › peer-review

Abstract

Statement of problem: The effect of screw-access holes and mechanical cycling on fracture resistance of 3-unit screw-retained zirconia-based implant-supported fixed dental prostheses (ISFDPs) is unknown.

Purpose: The purpose of this in vitro study was to evaluate the effect of screw-access holes on the maximum fracture load (L_f) of 3-unit ISFDPs fabricated with the same abutment design for screw (s)-retained and cement (c)-retained with either a metal- or zirconia-based framework, testing the hypotheses that ISFDPs with screw-access holes have the lowest L_f and that mechanical cycling decreases the L_f of screw-retained ISFDPs.

Material and methods: Models with fiberglass bases with 2 implants were fabricated. Special abutments were designed to allow for both s- and c-retained ISFDPs. The study considered the type of framework (s-retained metal-based and s-retained zirconia-based), fixation (s and c), and aging (a) with mechanical cycling, resulting in the following experimental groups (n=12): c-retained metal-based ISFDP; s-retained metal-based ISFDP (Ms); s-retained zirconia-based ISFDP aged by mechanical cycling (Zsa); and s-retained metal-based ISFDP aged by mechanical cycling (Msa). All ISFDPs were porcelain veneered and subjected to compressive load to failure. Fracture load data were statistically analyzed using 1-way ANOVA and Tukey range tests (α=.05). Fractography was used to evaluate the fracture surfaces.

Results: Cement-retained ISFDP (Zc and Mc) showed the greatest L_f values (P<.001). Zs prostheses showed higher L_f values than those for Ms. Aging significantly decreased the L_f of Zsa but had no effect on Msa. Chipping was the failure mode most frequently found. Only Zs and Zsa ISFDPs showed catastrophic failures. Conclusions ISFDPs with screw-access holes showed lower L_f values, regardless of the framework type. Mechanical cycling affected the L_f of screw-retained zirconia-based ISFDPs.

Original language	English
Pages (from-to)	124-131
Number of pages	9
Journal	Journal of Prosthetic Dentistry
Volume	119
Issue number	1
Early online date	3 May 2017
DOIs	https://doi.org/10.1016/j.prosdent.2017.01.016
Publication status	Published - Jan 2018

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10.1016/j.prosdent.2017.01.016

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@article{7dcaa15c7ab14251bb21e4f628155afd,

title = "Effect of screw-access hole and mechanical cycling on fracture load of 3-unit implant-supported fixed dental prostheses",

abstract = "Statement of problem: The effect of screw-access holes and mechanical cycling on fracture resistance of 3-unit screw-retained zirconia-based implant-supported fixed dental prostheses (ISFDPs) is unknown. Purpose: The purpose of this in vitro study was to evaluate the effect of screw-access holes on the maximum fracture load (Lf) of 3-unit ISFDPs fabricated with the same abutment design for screw (s)-retained and cement (c)-retained with either a metal- or zirconia-based framework, testing the hypotheses that ISFDPs with screw-access holes have the lowest Lf and that mechanical cycling decreases the Lf of screw-retained ISFDPs. Material and methods: Models with fiberglass bases with 2 implants were fabricated. Special abutments were designed to allow for both s- and c-retained ISFDPs. The study considered the type of framework (s-retained metal-based and s-retained zirconia-based), fixation (s and c), and aging (a) with mechanical cycling, resulting in the following experimental groups (n=12): c-retained metal-based ISFDP; s-retained metal-based ISFDP (Ms); s-retained zirconia-based ISFDP aged by mechanical cycling (Zsa); and s-retained metal-based ISFDP aged by mechanical cycling (Msa). All ISFDPs were porcelain veneered and subjected to compressive load to failure. Fracture load data were statistically analyzed using 1-way ANOVA and Tukey range tests (α=.05). Fractography was used to evaluate the fracture surfaces. Results: Cement-retained ISFDP (Zc and Mc) showed the greatest Lf values (P<.001). Zs prostheses showed higher Lf values than those for Ms. Aging significantly decreased the Lf of Zsa but had no effect on Msa. Chipping was the failure mode most frequently found. Only Zs and Zsa ISFDPs showed catastrophic failures. Conclusions ISFDPs with screw-access holes showed lower Lf values, regardless of the framework type. Mechanical cycling affected the Lf of screw-retained zirconia-based ISFDPs.",

author = "Fernando Mallmann and Luciano Rosa and M{\'a}rcia Borba and {Della Bona}, Alvaro",

note = "Publisher Copyright: {\textcopyright} 2017 Editorial Council for the Journal of Prosthetic Dentistry",

year = "2018",

month = jan,

doi = "10.1016/j.prosdent.2017.01.016",

language = "English",

volume = "119",

pages = "124--131",

journal = "Journal of Prosthetic Dentistry",

issn = "0022-3913",

publisher = "Elsevier BV",

number = "1",

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TY - JOUR

T1 - Effect of screw-access hole and mechanical cycling on fracture load of 3-unit implant-supported fixed dental prostheses

AU - Mallmann, Fernando

AU - Rosa, Luciano

AU - Borba, Márcia

AU - Della Bona, Alvaro

PY - 2018/1

Y1 - 2018/1

N2 - Statement of problem: The effect of screw-access holes and mechanical cycling on fracture resistance of 3-unit screw-retained zirconia-based implant-supported fixed dental prostheses (ISFDPs) is unknown. Purpose: The purpose of this in vitro study was to evaluate the effect of screw-access holes on the maximum fracture load (Lf) of 3-unit ISFDPs fabricated with the same abutment design for screw (s)-retained and cement (c)-retained with either a metal- or zirconia-based framework, testing the hypotheses that ISFDPs with screw-access holes have the lowest Lf and that mechanical cycling decreases the Lf of screw-retained ISFDPs. Material and methods: Models with fiberglass bases with 2 implants were fabricated. Special abutments were designed to allow for both s- and c-retained ISFDPs. The study considered the type of framework (s-retained metal-based and s-retained zirconia-based), fixation (s and c), and aging (a) with mechanical cycling, resulting in the following experimental groups (n=12): c-retained metal-based ISFDP; s-retained metal-based ISFDP (Ms); s-retained zirconia-based ISFDP aged by mechanical cycling (Zsa); and s-retained metal-based ISFDP aged by mechanical cycling (Msa). All ISFDPs were porcelain veneered and subjected to compressive load to failure. Fracture load data were statistically analyzed using 1-way ANOVA and Tukey range tests (α=.05). Fractography was used to evaluate the fracture surfaces. Results: Cement-retained ISFDP (Zc and Mc) showed the greatest Lf values (P<.001). Zs prostheses showed higher Lf values than those for Ms. Aging significantly decreased the Lf of Zsa but had no effect on Msa. Chipping was the failure mode most frequently found. Only Zs and Zsa ISFDPs showed catastrophic failures. Conclusions ISFDPs with screw-access holes showed lower Lf values, regardless of the framework type. Mechanical cycling affected the Lf of screw-retained zirconia-based ISFDPs.

AB - Statement of problem: The effect of screw-access holes and mechanical cycling on fracture resistance of 3-unit screw-retained zirconia-based implant-supported fixed dental prostheses (ISFDPs) is unknown. Purpose: The purpose of this in vitro study was to evaluate the effect of screw-access holes on the maximum fracture load (Lf) of 3-unit ISFDPs fabricated with the same abutment design for screw (s)-retained and cement (c)-retained with either a metal- or zirconia-based framework, testing the hypotheses that ISFDPs with screw-access holes have the lowest Lf and that mechanical cycling decreases the Lf of screw-retained ISFDPs. Material and methods: Models with fiberglass bases with 2 implants were fabricated. Special abutments were designed to allow for both s- and c-retained ISFDPs. The study considered the type of framework (s-retained metal-based and s-retained zirconia-based), fixation (s and c), and aging (a) with mechanical cycling, resulting in the following experimental groups (n=12): c-retained metal-based ISFDP; s-retained metal-based ISFDP (Ms); s-retained zirconia-based ISFDP aged by mechanical cycling (Zsa); and s-retained metal-based ISFDP aged by mechanical cycling (Msa). All ISFDPs were porcelain veneered and subjected to compressive load to failure. Fracture load data were statistically analyzed using 1-way ANOVA and Tukey range tests (α=.05). Fractography was used to evaluate the fracture surfaces. Results: Cement-retained ISFDP (Zc and Mc) showed the greatest Lf values (P<.001). Zs prostheses showed higher Lf values than those for Ms. Aging significantly decreased the Lf of Zsa but had no effect on Msa. Chipping was the failure mode most frequently found. Only Zs and Zsa ISFDPs showed catastrophic failures. Conclusions ISFDPs with screw-access holes showed lower Lf values, regardless of the framework type. Mechanical cycling affected the Lf of screw-retained zirconia-based ISFDPs.

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DO - 10.1016/j.prosdent.2017.01.016

M3 - Article

C2 - 28477919

AN - SCOPUS:85018990980

SN - 0022-3913

VL - 119

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JO - Journal of Prosthetic Dentistry

JF - Journal of Prosthetic Dentistry

IS - 1

ER -

Effect of screw-access hole and mechanical cycling on fracture load of 3-unit implant-supported fixed dental prostheses

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