Molar cusp deformation evaluated by micro-CT and enamel crack formation to compare incremental and bulk-filling techniques

Oliveira, Laís Rani Sales; Braga, Stella Sueli Lourenço; Bicalho, Aline Arêdes; Ribeiro, Maria Tereza Hordones; Price, Richard; Soares, Carlos José

doi:10.1016/j.jdent.2018.04.015

Cited by 40 publications

(19 citation statements)

References 47 publications

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“…Thirdly, we used micro-CT to accurately detect cracks according to resolution, previous study has concluded that micro-CT was an ideal technology for the diagnosis of cracks (20,21). Moisture content of dentine can in uence the detection of micro-CT.…”

Section: Discussionmentioning

confidence: 99%

Evaluate four different ways in diagnosing tooth cracks

Feng

Jiang

et al. 2020

Preprint

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Introduction The aim of this study was to evaluate four different ways in diagnosing tooth cracks, which may provide certain theoretical bases for early diagnosis of cracks. Methods 123 freshly extracted human teeth were collected in the Stomatology Hospital of Guangzhou Medical University, Guangzhou, China. Three observers examined the cracks of the crowns with naked eye, microscope, methylene blue dye, and methylene blue dye with magnification microscopic examination methods independently. Two criteria (crack lines appeared in enamel and dentin) were used to diagnose teeth cracks, and statistical analysis was performed using the SPSS and MedCalc statistical software. Kendall's W was conducted to assess the agreement among the three observers in each detection method. Sensitivity, specificity, positive predictive value, negative predictive value, and the area under the curve (AUC) drawn in terms of sensitivity and (1-specificity) were calculated to evaluate the diagnostic value of four different methods. Results 3 teeth were excluded because of the visual fatigue of the observer, and there were 120 teeth left. The method of methylene blue plus microscope had the lowest value of Kendall's W in criterion 1 and 2. The overall AUC values were more than 0.7 in both the microscopic and methylene blue plus microscopic method according to criterion 1 and 2, and in the method of naked-eye according to criterion 2. The pairwise comparison between A, B and C had statistical difference in the method of naked-eye, microscope and methylene blue plus microscope in criterion 2 ( P < 0.05). Conclusions Detecting tooth crack with the method of methylene blue plus microscope have a higher consistency among different experienced endodontists. Microscope and methylene blue dye with magnification microscopic examination were effective methods to diagnosis tooth crack. More cracks can be detected by experienced endodontists, and the difference persisted even with the use of microscopes or methylene blue dye.

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Section: Discussionmentioning

confidence: 99%

Evaluate four different ways in diagnosing tooth cracks

Feng

Jiang

et al. 2020

Preprint

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“…Despite the advantages of the incremental technique, it also has limitations, such as the greater possibility of incorporation of voids or debris between layers, an increase in the probability of adhesive failures between layers and greater difficulty of insertion in conservational preparations [3][4][5].…”

Section: O R I G I N a L A R T I C L Ementioning

confidence: 99%

“…Studies have been testing important factors for the determination of the behavior of bulk-fill resins in the face of the challenges and conditions to which they will be exposed when in the oral medium [6], and have resulted in promising conclusions when compared to conventional resins [7,8]; the reduction of porosity due to ease of insertion in the cavity, fracture resistance, dentin adhesion and preservation of marginal integrity [4]. However, because it is a recently introduced material on the market, there are still several questions to be answered.…”

Section: O R I G I N a L A R T I C L Ementioning

confidence: 99%

“…[9] The color change is a recurring cause of the aesthetic failure of composite resin restorations. The degree of color change can be affected by diet, load and organic matrix characteristics, degree of polymerization and water absorption, as well as finishing and polishing procedures, which influence the quality of the resin surface and may be related to the initial discoloration [4].…”

Section: O R I G I N a L A R T I C L Ementioning

confidence: 99%

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The impact of at home and in-office bleaching agents on the color stability of bulk-fill composite resins

Araújo

Lemes

Pachito

et al. 2019

BDS

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Objective: This study compared different composites for color stability after exposure to at home and in-office bleaching gels. Material and Methods: Composite resin specimens (6mm diameterx2mm thickness) were manufactured according to the following groups (n=20): RC- Conventional; BF-Bulk Fill; RF-Flow; BFF-Bulk-Fill Flow. The surfaces were stained with coffee solution for 36hrs. A spectrophotometer was used to record the initial color (L*a*b*). Half of the specimens from each group underwent bleaching with 35% hydrogen peroxide (in-office) in three 45-minute applications. New color measurements were performed after 7, 14 and 21 days. The other half of the specimens underwent bleaching with 22% carbamide peroxide (at home) in 14 1-hour applications. Further color measurements were performed after 7 and 14 hours. For comparison between the color coordinates in different periods, ANOVA for repeated measures was applied (α=5%). The color variation (ΔE) was calculated for each group. Results: For in-office bleaching, there were no significant differences between the periods b* coordinate of the RF group, and for L* and b* coordinates of the BFF group. For at home bleaching the groups BF and BFF showed no differences for the L* coordinate. For the other coordinates, there was difference between the initial periods and after 14 days. The ΔE variation presented higher values for the at home bleaching groups. For both whiteners the bulk-fill resins presented the greatest color variations. Conclusions: Bulk Fill resins do not guarantee greater color stability than the other composite resins tested, including conventional flow resin. The conventional composite resin showed the lower ΔE.

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“…Shrinkage stress can be affected by many factors such as cavity configuration (C-factor, cavity size, compliance of the cavity wall), material properties (polymerization shrinkage, matrix formulation, filler content, elastic modulus, the viscosity of the resin), and restoration technique (horizontal incremental pattern, oblique incremental pattern, bulk-fill) (3,4). Conventional resin composites should be placed in increments of up to 2mm to achieve acceptable resin properties and reduce shrinkage stress (5). However, this technique has some disadvantages, such as intermediate layer contamination, difficulty maintaining isolation, and increased operational time (6).…”

Section: Introductionmentioning

confidence: 99%

Fracture Resistance of Teeth Restored with Bulk-Fill and Fiber-Reinforced Composites in Class II Cavities

Keskin

Gündoğar

Tek

2020

Odovtos - Int J Dent Sc

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This study aimed to evaluate the fracture resistance of teeth restored with conventional, bulk-fill, and fiber-reinforced composite materials regarding intact teeth. Standard cavities were prepared on 70 sound third molar teeth. The teeth were randomly divided into six groups: intact teeth, conventional Bis-GMA based composite, fiber-reinforced composite, Bis-GMA based bulk-fill composite, ormocer based bulk-fill composite, glass containing resin-based bulk-fill composite. The data was obtained by a Universal Testing Machine and analyzed statistically. Fracture resistance of the teeth restored with conventional composite was significantly lower than the other groups (p<0.05). The teeth restored with fiber-reinforced composite showed the highest fracture resistance; however, there were no statistically significant differences between intact teeth and teeth restored with fiber-reinforced composite, Bis-GMA based bulk-fill composite, and glass containing resin-based bulk-fill composite (p>0.05). The obtained data showed that restoring teeth with bulk-fill and fiber-reinforced composites could be recommended in Class II cavities.

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Molar cusp deformation evaluated by micro-CT and enamel crack formation to compare incremental and bulk-filling techniques

Cited by 40 publications

References 47 publications

Evaluate four different ways in diagnosing tooth cracks

Evaluate four different ways in diagnosing tooth cracks

The impact of at home and in-office bleaching agents on the color stability of bulk-fill composite resins

Fracture Resistance of Teeth Restored with Bulk-Fill and Fiber-Reinforced Composites in Class II Cavities

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