Fracture resistance and marginal discrepancy of porcelain laminate veneers influenced by preparation design and restorative material in vitro

Background: Cerasmart hybrid material offers specific advantages such as less fragility and more flexibility than glass ceramics. This material also has the option of readily modifying or repairing the surface and favorable stress-absorbing characteristics. In our study, Cerasmart hybrid and lithium disilicate ceramic laminate veneers with two different preparation designs were compared with regards to their fracture resistance. Methods: A total of 52 of comparable human central maxillary incisors were used. Group A (n=26) was made up of Cerasmart hybrid ceramic laminate veneers were fabricated from Cerasmart blocks, while Group B (n=26) was made up of lithium disilicate ceramic laminate veneers were made of IPS e.max pressable ingots. Each group was subdivided in two equal subgroups according to preparation designs. Subgroup I comprised Featheredge preparation design and subgroup II: Wraparound preparation design. All samples were subjected to thermocycling between 5°C and 55°C in a water bath for a total of 1750 cycle with 10 seconds dwell time at each bath. The fracture load strength test was performed using a universal testing machine. Results: There was no statistically significant difference between all groups. E.max wraparound group recorded the highest fracture resistance mean value (422.1 N) followed by Cerasmart wraparound group (317.23 N), then e.max featheredge group (289.6 N), and finally Cerasmart featheredge group (259.3 N) had the lowest value as analyzed by one-way ANOVA. Conclusions: The Cerasmart hybrid material could be considered as a valid alternative to the widely used IPS e.max material. The fracture resistance of laminate veneers is not influenced by different type of preparation designs.

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Fracture Resistance of Composite Veneers with Different Preparation Designs

Balkan Journal of Dental Medicine ◽

10.1515/bjdm-2016-0016 ◽

2016 ◽

Vol 20 (2) ◽

pp. 99-103

Author(s):

Katerina Zlatanovska ◽

Ljuben Guguvcevski ◽

Risto Popovski ◽

Cena Dimova ◽

Ana Minovska ◽

...

Keyword(s):

Fracture Resistance ◽

In Vitro Study ◽

Fracture Load ◽

Group 3 ◽

The Mean ◽

Group 2 ◽

Preparation Design ◽

Frequent Localization ◽

Group 1

Summary Background: The aim of this in vitro study was to examine the fracture load of composite veneers using three different preparation designs. Material and methods: Fifteen extracted, intact, human maxillary central incisors were selected. Teeth were divided into three groups with different preparation design: 1) feather preparation, 2) bevel preparation, and 3) incisal overlap- palatal chamfer. Teeth were restored with composite veneers, and the specimens were loaded to failure. The localization of the fracture was recorded as incisal, gingival or combined. Results: Composite veneers with incisal overlap - palatal chamfer showed higher fracture resistance compared to feather preparation and bevel preparation. The mean (SD) fracture loads were: Group 1: 100.6±8.0 N, Group 2: 107.4±6.8 N, and Group 3: 122.0±8.8 N. The most common mode of failure was debonding for veneers with feather preparation and fracture when incisal edge is reduced. The most frequent localization of fracture was incisal. Conclusion: The type of preparation has a significant effect on fracture load for composite veneers. This study indicates that using an incisal overlap- palatal chamfer preparation design significantly increases the fracture resistance compared to feather and bevel preparation designs.

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In vitro evaluation of marginal fit of zirconia-reinforced lithium silicate laminate veneers at two thicknesses using different CAD/CAM systems

Brazilian Dental Science ◽

10.14295/bds.2020.v23i4.2071 ◽

2020 ◽

Vol 23 (4) ◽

pp. 9p

Author(s):

Manar Ahmed El-Mahdy ◽

Ahmed Khaled Aboelfadl ◽

Marwa Mohamed Wahsh

Keyword(s):

In Vitro Study ◽

Lithium Silicate ◽

Milling Machine ◽

Marginal Fit ◽

Cad Cam ◽

Marginal Discrepancy ◽

Post Hoc ◽

Laminate Veneers ◽

Cam Systems

ABSTRACTObjective: The purpose of this in vitro study was to evaluate the marginal fit of laminate veneers made of zirconia-reinforced lithium silicate with two thicknesses using different CAD/CAM systems. Material and methods: 42 Laminate veneers milled from zirconia-reinforced lithium silicate were divided into three main groups according to milling machine used into: group X5, laminate veneers fabricated by inLab MCX5 milling machine; group CM, laminate veneers fabricated by Ceramill motion 2; and group XL, laminate veneers fabricated by inLab MCXL. Each group was divided into two subgroups according to veneer thickness into: subgroup I, 0.5 mm thickness laminate veneers and subgroup II, 0.3 mm thickness laminate veneers. The marginal fit was measured using stereomicroscope. The results were tabulated and statistically analyzed using two-way ANOVA test followed by Tukey’s post hoc test. Comparisons of main and simple effects were done utilizing Bonferroni correction (P ? 0.05). Results: The mean (±SD) highest marginal discrepancy was recorded in subgroup BII at 85.45±1.82 µm while the least mean marginal discrepancy was recorded in subgroup AI 71.24±2.64 µm. Conclusion: Both thicknesses (0.5 mm thickness and 0.3 mm thickness) and all tested CAD/CAM systems produced zirconia-reinforced lithium silicate laminate veneers with clinically acceptable marginal gaps; however, the closed CAD/CAM systems produced veneers with superior marginal fit than open systems at 0.3 mm thickness. The CAD/CAM system with the 5-axis milling machine produced the best marginal fit with 0.5 mm thickness. KEYWORDS Marginal fit; Zirconia-reinforced lithium silicate; Laminate veneers; CAD/CAM; Milling machines. RESUMOObjetivo: O objetivo deste estudo in vitro foi avaliar a adaptação marginal de facetas laminadas de silicato de lítio reforçado com zircônia com duas espessuras, utilizando diferentes sistemas CAD / CAM. Material e métodos: 42 facetas laminadas fresadas a partir de silicato de lítio reforçado com zircônia foram divididos em três grupos principais de acordo com a fresadora usada em: grupo X5, facetas laminadas fabricados pela fresadora inLab MCX5; grupo CM, facetas laminadas fabricados por Ceramill motion 2; e grupo XL, facetas laminadas fabricados pelo inLab MCXL. Cada grupo foi dividido em dois subgrupos, de acordo com a espessura do laminado, em: subgrupo I, facetas laminadas com 0,5 mm de espessura e subgrupo II, facetas laminadas com espessura de 0,3 mm. A adaptação marginal foi medida usando estereomicroscópio. Os resultados foram tabulados e analisados estatisticamente usando o teste ANOVA de dois fatores seguido pelo teste post hoc de Tukey. Comparações dos efeitos principais e simples foram realizadas utilizando a correção de Bonferroni (P ?0,05). Resultados: A maior discrepância marginal média (± DP) foi registrada no subgrupo BII em 85,45 ± 1,82 µm, enquanto a menor discrepância marginal média foi registrada no subgrupo AI 71,24 ± 2,64 µm. Conclusão: Ambas as espessuras (0,5 mm e 0,3 mm) e todos os sistemas CAD / CAM testados produziram facetas de laminado de silicato de lítio reforçadas com zircônia com lacunas clinicamente aceitáveis. No entanto, os sistemas CAD / CAM fechados produziam facetas com adaptação marginal superior aos sistemas abertos com 0,3 mm de espessura. O sistema CAD / CAM com a fresadora de 5 eixos produziu a melhor adaptação marginal com 0,5 mm de espessura.PALAVRAS-CHAVE Adaptação marginal; Silicato de lítio reforçado com zircônia; Facetas laminados; CAD / CAM; Fresadoras.

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The Influence of Different Ceramics and Resin Cements on the Color Stability, Marginal Discrepancy and Fracture Resistance of Ceramic Laminate Veneers

Al-Azhar Dental Journal for Girls ◽

10.21608/adjg.2021.23141.1224 ◽

2021 ◽

Vol 0 (0) ◽

pp. 0-0

Author(s):

Ahmed Allam ◽

sahar Abd El-Aziz ◽

hussien mohamed

Keyword(s):

Fracture Resistance ◽

Color Stability ◽

Resin Cements ◽

Marginal Discrepancy ◽

Laminate Veneers

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Partial Ceramic Crowns: Influence of Ceramic Thickness, Preparation Design and Luting Material on Fracture Resistance and Marginal Integrity In Vitro

Operative Dentistry ◽

10.2341/06-70 ◽

2007 ◽

Vol 32 (3) ◽

pp. 251-260 ◽

Cited By ~ 35

Author(s):

M. Federlin ◽

S. Krifka ◽

M. Herpich ◽

K-A. Hiller ◽

G. Schmalz

Keyword(s):

Clinical Relevance ◽

Fracture Resistance ◽

Adhesively Bonded ◽

Marginal Integrity ◽

Partial Ceramic Crowns ◽

Ceramic Crowns ◽

Ceramic Thickness ◽

Preparation Design ◽

Luting Material

Clinical Relevance For fracture resistance and the marginal integrity of adhesively bonded partial ceramic crowns (PCC), the choice of ceramic thickness and luting material are more important than preparation design. PCC fabricated from industrially sintered feldspathic ceramic should have at least a thickness of 1.5–2.0 mm in stress bearing areas.

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An in vitro Evaluation of Fracture Resistance of endodontically treated Teeth with Different Restorative Materials

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-1887 ◽

2016 ◽

Vol 17 (7) ◽

pp. 549-552 ◽

Cited By ~ 1

Author(s):

Mukut Seal ◽

Pratim Talukdar ◽

Babita Sangwan ◽

Rahul Rishi ◽

Kanav Jain ◽

...

Keyword(s):

Fracture Resistance ◽

Therapy Group ◽

Control Group ◽

Restorative Material ◽

Endodontically Treated Teeth ◽

Silver Amalgam ◽

Group I ◽

Significant Difference ◽

Restorative Materials

ABSTRACT Aims The aim of the present study is to compare and assess the fracture resistance of root canal treated teeth with different restorative materials. Materials and methods The present in vitro study was carried out on seventy-five freshly extracted, noncarious, single-canal human lower-first premolars with similar anatomic characteristics. Teeth were randomly assigned to five groups with 15 teeth being present in each group. Group I is control group (no alteration done), group II is restored with silver amalgam after endodontic therapy, group III is restored with posterior composite after endodontic therapy, group IV is restored with posterior glass ionomer cement (GIC) after endodontic therapy, and group V is restored with miracle mix after endodontic therapy. Universal testing machine was used to assess the fracture strength. Analysis of variance (ANOVA) test followed by Tukey's post hoc test were used to determine the significant difference between each group. A p-value of < 0.05 was considered as statistically significant. Results The mean fracture resistance of control group showed highest fracture resistance with a mean Newton of 1083.33 ± 136.78. Among the restorative material, the highest fracture resistance was shown by teeth restored by composite (845.46 ± 47.36), followed by silver amalgam (845.46 ± 47.36). There was statistically significant difference among all the restorative materials compared with the control group (p < 0.05). However, among the teeth restored with silver amalgam and miracle mix, there was no statistical significance (p > 0.05). Conclusion The present study concludes that composites are found to be having more fracture resistance followed by silver amalgam on endodontically treated premolar teeth. Clinical significance Restoring nonvital teeth represents a major challenge for clinicians as they are extensively damaged due to caries and endodontic access preparations. With various restorative materials in the market, it becomes difficult for the clinician to choose the better restorative material for postendodontic restoration. How to cite this article Sangwan B, Rishi R, Seal M, Jain K, Dutt P, Talukdar P. An in vitro Evaluation of Fracture Resistance of endodontically treated Teeth with Different Restorative Materials. J Contemp Dent Pract 2016;17(7):549-552.

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