Effect of Inlays, Onlays and Endocrown Cavity Design Preparation on Fracture Resistance and Fracture Mode of Endodontically Treated Teeth: An In Vitro Study

Kassis, Cynthia; Khoury, Pierre El; Zogheib, Carina Mehanna; Baba, Nadim Z.; Chebel, Fadi Bou; Daou, Maha; Hardan, Louis

doi:10.1111/jopr.13294

Cited by 35 publications

(40 citation statements)

References 37 publications

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“…Compared to zirconia ceramic material, glass-ceramic [12,13] has better adhesive property and sound wear resistance which causes less wear of the clutch tooth. In addition, the horizontal stress of the whole occlusal cusp covered by onlay is less than that of the partial occlusal cusp [14]. Moreover, the tooth preparation of onlay is only related to occlusal surface, 45% less than the full crown [4], which can preserve more tooth structure.…”

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confidence: 99%

Clinical Performance of Lithium Disilicate Glass-Ceramic Onlays For The Treatment of Tooth Defects

Chen

Zhu

et al. 2021

Preprint

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BackgroundThe aim of this study was to assess the clinical performance of lithium disilicate glass-ceramic onlays for the treatment of tooth defects and to evaluate the clinical performance and whether they are worth more extensive use as that of the full crown. MethodsPatients who received treatment by lithium disilicate glass-ceramic onlays at the Western China Hospital of Stomatology were recalled after 1~4 years. The clinical performance and patients’ satisfaction of onlays for various tooth defects, cracked or uncracked teeth and endodontically treated or vital teeth were retrospectively evaluated with a combination of modified United States Public Health Service Criteria and questionnaire survey. Statistical analysis was performed by using the chi-squared test, Kaplan–Meier analysis and Log-rank test (a = 0.05) where appropriate. ResultsA total of 154 patients with 166 onlays were recalled for clinical examination. Of the 166 onlays examined, 65 (39.19%) were occlusal onlays, 92 (55.42%) were proximal-occlusive onlays and 9 (5.42%) were buccal-or lingual-occlusal onlays. The clinical performance of O and PO onlays was not significantly different (P > 0.05), according to USPHS Criteria. Kaplan-Meier analysis showed that the 4-year survival rate of O and PO onlays was 95.4% and 97.8%, respectively while there was no failure happened in buccal-or lingual-occlusal onlays. Log- rank test showed that the kinds of defects/onlays, tooth vitality and tooth crack had no influence on the survival rate (P > 0.05). The overall satisfaction rate was more than 98%.ConclusionsThis medium-term analysis indicated that lithium disilicate glass-ceramic onlays achieved satisfactory clinical performance for the restoration of different tooth defects. The survival rate of onlays was comparable to that of full crown. Different kinds of tooth defects, tooth vitality and tooth crack did not influence performance.Trial registrationThe study was approved by the Medical Ethics Committee of West China Hospital of Stomatology of Sichuan University with the approval number: WCHSIRB-D-2021-300. Consent to participate was not applicable.

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confidence: 99%

Clinical Performance of Lithium Disilicate Glass-Ceramic Onlays For The Treatment of Tooth Defects

Chen

Zhu

et al. 2021

Preprint

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“…It was not our objective to structurally characterize the material, since there is sufficient information in this regard, so a fractographic analysis was not performed. Some studies of this type have not performed this analysis either [ 46 , 47 ]. Finally, more studies that can perform a structural analysis are needed to better understand what happens to the materials after applying various heat treatments to them.…”

Section: Discussionmentioning

confidence: 99%

Fracture Resistance of Sintered Monolithic Zirconia Dioxide in Different Thermal Units

et al. 2022

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The purpose of this study was to compare the fracture strength of monolithic zirconium dioxide subjected to a sintering process in two different furnaces: InFire HTC Speed and CEREC SpeedFire. Methods: Forty restorations were designed and machined using a computer aided design/computer aidded machine (CAD/CAM) system. The restorations were randomly assigned to two groups of 20 samples each, Group 1 for the SpeedFire furnace (fast sintering) and Group 2 for the InFire furnace (slow sintering). Each of the crowns was subjected to a maximum compression load recorded in Newtons (N) and a displacement control with a speed of 1 mm/min. Results: Group 1 presented an average of 1222.8 N and a standard deviation of 136.91 N. Group 2 obtained a mean of 1068.5 N and a standard deviation of 316.39 N. Conclusions: There were no significant differences between the two groups, and the mechanical strength of the material was not affected, which would imply a saving of clinical and laboratory time when performing rapid sintering on monolithic translucent zirconium dioxide restorations. However, rapidly sintered restorations have limited reliability.

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“…In endodontically treated teeth, indirect restorative techniques demonstrated improved fracture resistance in posterior teeth compared to direct techniques [26]. The study of [27] showed that the most suitable indirect restorations for these cases are endocrowns. For inlays, the fracture mode varied according to the preparation configuration.…”

Section: Discussionmentioning

confidence: 99%

Influence of Cement Thickness on the Polymerization Shrinkage Stress of Adhesively Cemented Composite Inlays: Photoelastic and Finite Element Analysis

Campaner¹,

Pinto²,

Demachkia³

et al. 2021

Oral

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The objective of this study was to analyze the effect of cement thickness on the strain and stresses resulting from the polymerization of resin cement using photoelasticity and Finite Element Analysis (FEA). For this study, twenty upper first premolars with inlay cavity preparation were constructed from photoelastic resin and restored with composite resin inlay. The samples were divided into two groups (n = 10) according to the film thickness of resin cement material. For Group 1, the film thickness was 100 μm; for Group 2, the film thickness was 400 μm. After polymerization of the cement, photoelastic analysis and finite element analysis (FEA) were performed. In the photoelastic analysis, Group 2 showed higher strain with the presence of second-order fringe even after 24 h. In Group 1, the formation of first order fringes was not observed, even after 24 h. In the FEA analysis, the greatest cusp deflection and tensile stress occurred in Group 2 (0.00026 mm and 0.305 MPa, respectively) due to the polymerization shrinkage in the lingual cusp compared to Group 1 (0.000107 mm and 0.210 MPa, respectively). It can be concluded that the thickness of the resin cement influences the cusp deflection, with the greater thickness of the cement layer, the greater stresses and deformations in the tooth structure occur.

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Effect of Inlays, Onlays and Endocrown Cavity Design Preparation on Fracture Resistance and Fracture Mode of Endodontically Treated Teeth: An In Vitro Study

Cited by 35 publications

References 37 publications

Clinical Performance of Lithium Disilicate Glass-Ceramic Onlays For The Treatment of Tooth Defects

Clinical Performance of Lithium Disilicate Glass-Ceramic Onlays For The Treatment of Tooth Defects

Fracture Resistance of Sintered Monolithic Zirconia Dioxide in Different Thermal Units

Influence of Cement Thickness on the Polymerization Shrinkage Stress of Adhesively Cemented Composite Inlays: Photoelastic and Finite Element Analysis

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