Fracture resistance of endodontically treated maxillary premolars restored with CAD/CAM ceramic inlays

Hannig, Christian; Westphal, Christoph H.; Becker, K.; Attin, Thomas

doi:10.1016/j.prosdent.2005.08.004

Cited by 65 publications

(89 citation statements)

References 32 publications

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“…Clinical failure rate, aesthetic outcome and stabilisation of tooth substance are favourable for ceramics [16,17,40], whereas direct composite fillings exhibit lower marginal integrity in clinical practice and produce a lower stabilisation effect on remaining tooth substance [40,41]. Possible disadvantages of aesthetic silicate ceramic inlays are demonstrated by reports of breakage and chipping [40,41].…”

Section: Discussionmentioning

confidence: 99%

“…To the best of our knowledge, at present, there is no information available on the fracture load of molars restored with adhesively luted PMMA-based CAD/CAM inlays, whereas fracture load and marginal adaptation of CAD/CAM ceramic inlays has been investigated under various conditions in recent studies [15][16][17]. The first steps in evaluating whether unfilled PMMA-based CAD/CAM block material may be suitable to be used for permanent occlusion bearing molar inlays should assess marginal integrity after mechanical loading and thermal stressing by a chewing fatigue test [18].…”

Section: Introductionmentioning

confidence: 99%

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Marginal adaptation, fracture load and macroscopic failure mode of adhesively luted PMMA-based CAD/CAM inlays

et al. 2016

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OBJECTIVES To evaluate marginal adaptation, fracture load and failure types of CAD/CAM polymeric inlays. METHODS Standardized prepared human molars (48) were divided into four groups (n=12): (A) PCG (positive control group); adhesively luted glass-ceramic inlays, (B) TRX; CAD/CAM polymeric inlays luted using a self-adhesive resin cement, (C) TAC; CAD/CAM polymeric inlays luted using a conventional resin cement, and (D) NCG (negative control group); direct-filled resin-based composite restorations. All specimens were subjected to a chewing simulator. Before and after chewing fatigue, marginal adaptation was assessed at two interfaces: (1) between dental hard tissues and luting cement and (2) between luting cement and restoration. Thereafter, the specimens were loaded and the fracture loads, as well as the failure types, were determined. The data were analysed using three-and one-way ANOVA with post hoc Scheffé test, two sample Student's t-test (p<0.05). RESULTS Before and after chewing fatigue, marginal adaptation for interface 1 showed significantly better results for TRX and PCG than for TAC (p=0.001-0.02) and NCG (p=0.001-0.047). For interface 2, marginal adaptation for TAC was significantly inferior to TRX (p<0.001) and PCG (p<0.001). Chewing fatigue had a negative impact on the marginal adaptation of TAC and NCG. No significant differences in fracture load were found between all tested groups. SIGNIFICANCE Self-adhesive luted polymeric CAD/CAM inlays showed similar marginal adaptation and fracture load values compared to adhesively luted glass-ceramic inlays. CAD/CAM polymeric inlays luted using a self-adhesive resin cement, C) TAC; CAD/CAM polymeric inlays luted using a conventional resin cement, and D) NCG (negative control group); direct-filled resin-based composite restorations. All specimens were subjected to a chewing simulator. Before and after chewing fatigue, marginal adaptation was assessed at two interfaces: 1) between dental hard tissues and luting cement and 2) between luting cement and restoration. Thereafter, the specimens were loaded and the fracture loads, as well as the failure types, were determined. The data were analysed using three-and one-way ANOVA with post-hoc Scheffé test, two sample Student's t-test and Weibull statistics (p < 0.05).Results: Before and after chewing fatigue, marginal adaptation for interface 1 showed significantly better results for TRX and PCG than for TAC (p = 0.001 -0.02) and NCG (p = 0.001 -0.047). For interface 2, marginal adaptation for TAC was significantly inferior to TRX (p < 0.001) and PCG (p < 0.001). Chewing fatigue had a negative impact on the marginal adaptation of TAC and NCG. No significant differences in fracture load were found between all tested groups. Group TAC showed the highest Weibull moduli (m = 4.49) and group PCG the lowest (m = 2.78).Significance: Self-adhesive luted polymeric CAD/CAM inlays showed similar marginal adaptation and fracture load values compared to adhesively luted glass-ceramic inlays.3

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Marginal adaptation, fracture load and macroscopic failure mode of adhesively luted PMMA-based CAD/CAM inlays

et al. 2016

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“…Hannig et al 33 indicated that premolars restored with the CAD/CAM system presented a number of severe fractures, which was significantly greater then the results obtained with the control group of premolars. Overall, this present investigation found that the studied restoring strategies to restore inlay cavities in premolars reestablished the cuspal deflection to values that were similar to sound teeth.…”

Section: -41mentioning

confidence: 96%

Effects of Toothbrushing with Fluoride Abrasive and Whitening Dentifrices on Both Unbleached and Bleached Human Enamel Surface in Terms of Roughness and Hardness: An in vitro Study

Zamboni

Nogueira

Bottino

et al. 2012

The Journal of Contemporary Dental Practice

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Aim: This study assessed the effect of fatigue load cycling on human premolars restored with MOD restorations (direct and indirect approaches) on cuspal deflection, compared to intact teeth (unprepared) and unrestored teeth with an inlay preparation. Materials and methods:MOD inlay preparations were performed on sixty premolars with their roots embedded in acrylic resin. These teeth were divided into six groups (n = 10): (1) intact teeth; (2) unrestored and prepared teeth; (3) teeth restored with direct composite resin; (4) teeth restored with an indirect composite resin; (5) teeth restored with injected ceramic inlays (IPS Empress 2 (Ivoclar); (6) teeth restored with CAD/CAM inlays made of feldspathic ceramic (Vita Mark II). All of the indirect restorations were adhesively cemented. Strain-gauges were bonded to the buccal and lingual surfaces of the specimens. Compressive axial loading of 100N was applied on the occlusal face of the specimens to measure the cuspal deflection (microstrain) under compressive loading. These measurements were obtained before and after mechanical cycling (1 Hz, 37°C, 100,000x). Results:Comparing the results obtained before and after fatiguing, the cuspal deflection increased only in the CAD/CAM approach. The prepared tooth group had the highest cuspal deflection, before and after mechanical cycling. Conclusion:The evaluated restoring approaches decrease the cuspal deflection, consequently appear to improve the cuspal reinforcement.

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“…10 Ceramic inlays, onlays, and endocrowns have been introduced as alternative restorations for endodontically treated molars, depending on the availability of remaining tooth structure. [11][12][13][14] Initially proposed by Pissis 15 in 1995, endocrowns are a type of restoration consisting of the entire core and crown as a single unit (ie, monoblock). Endocrowns use the available surface of the pulp chamber axial walls as macroretentive resources and adhesive resin cement as a means of micromechanical retention.…”

Section: Introductionmentioning

confidence: 99%

Fracture Resistance and Microleakage of Endocrowns Utilizing Three CAD-CAM Blocks

El-Damanhoury¹,

Haj-Ali²,

Platt³

2015

Operative Dentistry

152

147

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Fracture resistance and mode of failure of CAD/CAM-fabricated monoblock endocrowns varies widely between materials. Clinicians should be cautious with material selection for endocrown restorations. SUMMARYThis study assessed marginal leakage and fracture resistance of computer-aided design/ computer-aided manufacturing (CAD/CAM) fabricated ceramic crowns with intracoronal extensions into the pulp chambers of endodontically treated teeth (endocrowns) using either feldspathic porcelain (CEREC Blocks [CB], Sirona Dental Systems GmbH, Bensheim, Germany), lithium disilicate (e.max [EX], Ivoclar Vivadent, Schaan, Liechtenstein), or resin nanoceramic (Lava Ultimate [LU], 3M ESPE, St Paul, MN, USA).). Thirty extracted human permanent maxillary molars were endodontically treated. Standardized preparations were done with 2-mm intracoronal extensions of the endocrowns into the pulp chamber. Teeth were divided into three groups (n=10); each group was restored with standardized CAD/CAM fabricated endocrowns using one of the three tested materials. After cementation with resin cement, specimens were stored in distilled water at 378C for one week, subjected to thermocycling, and immersed in a 5% methylene-blue dye solution for 24 hours. A compressive load was applied at 35 degrees to long axis of the teeth using a universal testing machine until failure. Failure load was recorded, and specimens were examined under a stereomicroscope for modes of failure and microleakage. Results were analyzed using one-way analysis of variance and Bonferroni post hoc multiple comparison tests (a=0.05). LU showed significantly (p,0.05) higher fracture resistance and more favorable fracture mode (ie, fracture of the endocrown without fracture of tooth) as well as higher dye penetration than CB and EX. In conclusion, although using resin

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Fracture resistance of endodontically treated maxillary premolars restored with CAD/CAM ceramic inlays

Cited by 65 publications

References 32 publications

Marginal adaptation, fracture load and macroscopic failure mode of adhesively luted PMMA-based CAD/CAM inlays

Marginal adaptation, fracture load and macroscopic failure mode of adhesively luted PMMA-based CAD/CAM inlays

Effects of Toothbrushing with Fluoride Abrasive and Whitening Dentifrices on Both Unbleached and Bleached Human Enamel Surface in Terms of Roughness and Hardness: An in vitro Study

Fracture Resistance and Microleakage of Endocrowns Utilizing Three CAD-CAM Blocks

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