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Fracture strength, failure type and Weibull characteristics of lithium disilicate and multiphase resin composite endocrowns under axial and lateral forces.
Dent Mater. 2016 May; 32(5):607-14.DM

Abstract

OBJECTIVE

Multiphase resin composite materials have been advocated as an alternative to reinforced ceramics but limited information is available to date on their stability. This in vitro study evaluated the effect of axial and lateral forces on the strength of endocrowns made of Li2Si2O5 and multiphase resin composite.

METHODS

Sound human molars (N=60, n=10 per group) were randomly divided into 6 groups: Group C: Control, no preparation or restoration; Group LI: Endocrown made of Li2Si2O5 (IPS e.max CAD) and Group LA: Endocrown made of multiphase resin composite material (Lava Ultimate). After decapitation and endodontic preparation, immediate dentin sealing was performed. Following CAD/CAM fabrication, their cementation surfaces were silica coated (CoJet System) and silanized (ESPE-Sil). Endocrowns were then adhesively cemented (Variolink II). All specimens were thermocycled (×10,000 cycles). While half of the specimens in each group were subjected to axial (C(A), LI(A), LA(A)), the other half was subjected to lateral static (C(L), LI(L), LA(L)) loading (1mm/min). Failure type and location after debonding/fracture were classified. Data were analyzed using ANOVA and Tukey's post hoc test (α=0.05). Two-parameter Weibull distribution values including the Weibull modulus, scale (m) and shape (0), values were calculated.

RESULTS

Under axial loading, mean fracture strength (N) did not show significant difference between groups: LAA (2675±588)(a), LIA (2428±566)(a), CA (2151±672)(a) (p>0.05) and under lateral loading, LAL (838±169)(A) presented significantly lower mean values than those of other groups: CL (1499±418)(B), LIL (1118±173)(B) (p<0.05). Both endocrown materials and the control group were more vulnerable to lateral loading than axial loading. Under axial loading, Weibull distribution presented higher shape (0) for Groups LIA (5.35) and LAA (5.08) than that of the control (3.97) and under lateral loading LIL (7.5) showed higher shape (0) than those of other groups (4.69-6.46). After axial loading, failure types were mainly cohesive in the material and after lateral loading primarily adhesive between the material and dentin for both LI and LA, most of which were repairable.

SIGNIFICANCE

Under axial loading, molars restored with endocrowns performed similar with both Li2Si2O5 and multiphase resin composite but the latter was less durable under lateral loading.

Authors+Show Affiliations

The University of Groningen, Groningen, University Medical Center Groningen, Center for Dentistry and Oral Hygiene, Department of Fixed and Removable Prosthodontics, Groningen, The Netherlands. Electronic address: marcogresnigt@yahoo.com.University of Zurich, Dental Materials Unit, Center for Dental and Oral Medicine, Clinic for Fixed and Removable Prosthodontics and Dental Materials Science, Zurich, Switzerland.The University of Groningen, Groningen, University Medical Center Groningen, Center for Dentistry and Oral Hygiene, Department of Fixed and Removable Prosthodontics, Groningen, The Netherlands.The University of Groningen, Groningen, University Medical Center Groningen, Center for Dentistry and Oral Hygiene, Department of Fixed and Removable Prosthodontics, Groningen, The Netherlands.The University of Groningen, Groningen, University Medical Center Groningen, Center for Dentistry and Oral Hygiene, Department of Fixed and Removable Prosthodontics, Groningen, The Netherlands; St. Antonius Hospital Nieuwegein, Department of Oral-Maxillofacial Surgery, Prosthodontics and Special Dental Care, Nieuwegein, The Netherlands.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

26935018

Citation

Gresnigt, Marco M M., et al. "Fracture Strength, Failure Type and Weibull Characteristics of Lithium Disilicate and Multiphase Resin Composite Endocrowns Under Axial and Lateral Forces." Dental Materials : Official Publication of the Academy of Dental Materials, vol. 32, no. 5, 2016, pp. 607-14.
Gresnigt MM, Özcan M, van den Houten ML, et al. Fracture strength, failure type and Weibull characteristics of lithium disilicate and multiphase resin composite endocrowns under axial and lateral forces. Dent Mater. 2016;32(5):607-14.
Gresnigt, M. M., Özcan, M., van den Houten, M. L., Schipper, L., & Cune, M. S. (2016). Fracture strength, failure type and Weibull characteristics of lithium disilicate and multiphase resin composite endocrowns under axial and lateral forces. Dental Materials : Official Publication of the Academy of Dental Materials, 32(5), 607-14. https://doi.org/10.1016/j.dental.2016.01.004
Gresnigt MM, et al. Fracture Strength, Failure Type and Weibull Characteristics of Lithium Disilicate and Multiphase Resin Composite Endocrowns Under Axial and Lateral Forces. Dent Mater. 2016;32(5):607-14. PubMed PMID: 26935018.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fracture strength, failure type and Weibull characteristics of lithium disilicate and multiphase resin composite endocrowns under axial and lateral forces. AU - Gresnigt,Marco M M, AU - Özcan,Mutlu, AU - van den Houten,Mieke L A, AU - Schipper,Laura, AU - Cune,Marco S, Y1 - 2016/02/28/ PY - 2015/02/09/received PY - 2015/06/20/revised PY - 2016/01/15/accepted PY - 2016/3/4/entrez PY - 2016/3/5/pubmed PY - 2017/10/12/medline KW - CAD/CAM KW - Ceramic KW - Composite KW - Endocrowns KW - Endodontics KW - Hybrid materials KW - Lithium disilicate SP - 607 EP - 14 JF - Dental materials : official publication of the Academy of Dental Materials JO - Dent Mater VL - 32 IS - 5 N2 - OBJECTIVE: Multiphase resin composite materials have been advocated as an alternative to reinforced ceramics but limited information is available to date on their stability. This in vitro study evaluated the effect of axial and lateral forces on the strength of endocrowns made of Li2Si2O5 and multiphase resin composite. METHODS: Sound human molars (N=60, n=10 per group) were randomly divided into 6 groups: Group C: Control, no preparation or restoration; Group LI: Endocrown made of Li2Si2O5 (IPS e.max CAD) and Group LA: Endocrown made of multiphase resin composite material (Lava Ultimate). After decapitation and endodontic preparation, immediate dentin sealing was performed. Following CAD/CAM fabrication, their cementation surfaces were silica coated (CoJet System) and silanized (ESPE-Sil). Endocrowns were then adhesively cemented (Variolink II). All specimens were thermocycled (×10,000 cycles). While half of the specimens in each group were subjected to axial (C(A), LI(A), LA(A)), the other half was subjected to lateral static (C(L), LI(L), LA(L)) loading (1mm/min). Failure type and location after debonding/fracture were classified. Data were analyzed using ANOVA and Tukey's post hoc test (α=0.05). Two-parameter Weibull distribution values including the Weibull modulus, scale (m) and shape (0), values were calculated. RESULTS: Under axial loading, mean fracture strength (N) did not show significant difference between groups: LAA (2675±588)(a), LIA (2428±566)(a), CA (2151±672)(a) (p>0.05) and under lateral loading, LAL (838±169)(A) presented significantly lower mean values than those of other groups: CL (1499±418)(B), LIL (1118±173)(B) (p<0.05). Both endocrown materials and the control group were more vulnerable to lateral loading than axial loading. Under axial loading, Weibull distribution presented higher shape (0) for Groups LIA (5.35) and LAA (5.08) than that of the control (3.97) and under lateral loading LIL (7.5) showed higher shape (0) than those of other groups (4.69-6.46). After axial loading, failure types were mainly cohesive in the material and after lateral loading primarily adhesive between the material and dentin for both LI and LA, most of which were repairable. SIGNIFICANCE: Under axial loading, molars restored with endocrowns performed similar with both Li2Si2O5 and multiphase resin composite but the latter was less durable under lateral loading. SN - 1879-0097 UR - https://www.unboundmedicine.com/medline/citation/26935018/Fracture_strength_failure_type_and_Weibull_characteristics_of_lithium_disilicate_and_multiphase_resin_composite_endocrowns_under_axial_and_lateral_forces_ DB - PRIME DP - Unbound Medicine ER -