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Marginal gap, internal fit, and fracture load of leucite-reinforced ceramic inlays fabricated by CEREC inLab and hot-pressed techniques.
J Prosthodont. 2011 Oct; 20(7):535-40.JP

Abstract

PURPOSE

This in vitro study was designed to evaluate and compare the marginal gap, internal fit, and fracture load of resin-bonded, leucite-reinforced glass ceramic mesio-occlusal-distal (MOD) inlays fabricated by computer-aided design/manufacturing (CAD/CAM) or hot pressing.

MATERIALS AND METHODS

Fifty caries-free extracted human molars were prepared for standardized MOD inlays. Impressions of each specimen were made and poured using type IV dental stone. Dies were randomly divided into two equal groups. Twenty-five ceramic inlays were fabricated by the hot-pressed technique using IPS Empress leucite-reinforced glass ceramics, and the other 25 ceramic inlays were produced by CAD/CAM technology using ProCAD leucite-reinforced ceramic blocks and CEREC inLab facilities. Inlays were bonded to the teeth using a dual-cured resin cement. The specimens were stored in distilled water at 37°C for 24 hours and then thermocycled for 5000 cycles. The marginal gap measurements were taken with a stereomicroscope. Specimens in each group of inlay systems were randomly divided into two subgroups of 10 and 15 specimens each. Ten specimens in each subgroup were sectioned mesiodistally for evaluation of the internal fit. The fracture load of specimens in the second subgroup (n = 15) of the two inlay systems was determined under compressive load in a universal testing machine. Data were analyzed using Student's t-test at a significance level of p < 0.05.

RESULTS

The mean marginal and internal gap size in both IPS Empress and ProCAD inlays were less than 100 μm; however, the marginal gap for the IPS Empress restorations was significantly higher than that of ProCAD restorations (p < 0.05). There was no significant difference in the mean internal fit or the fracture load between the two glass ceramic inlays (p > 0.05).

CONCLUSIONS

The leucite-reinforced glass ceramic inlay restorations fabricated by CEREC inLab (CAD/CAM) and the hot-pressed technique provided clinically acceptable marginal and internal fit with comparable fracture loads after luting.

Authors+Show Affiliations

Department of Prosthodontics, School of Dentistry, Shahed University, Tehran, Iran.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

21806704

Citation

Keshvad, Alireza, et al. "Marginal Gap, Internal Fit, and Fracture Load of Leucite-reinforced Ceramic Inlays Fabricated By CEREC inLab and Hot-pressed Techniques." Journal of Prosthodontics : Official Journal of the American College of Prosthodontists, vol. 20, no. 7, 2011, pp. 535-40.
Keshvad A, Hooshmand T, Asefzadeh F, et al. Marginal gap, internal fit, and fracture load of leucite-reinforced ceramic inlays fabricated by CEREC inLab and hot-pressed techniques. J Prosthodont. 2011;20(7):535-40.
Keshvad, A., Hooshmand, T., Asefzadeh, F., Khalilinejad, F., Alihemmati, M., & Van Noort, R. (2011). Marginal gap, internal fit, and fracture load of leucite-reinforced ceramic inlays fabricated by CEREC inLab and hot-pressed techniques. Journal of Prosthodontics : Official Journal of the American College of Prosthodontists, 20(7), 535-40. https://doi.org/10.1111/j.1532-849X.2011.00745.x
Keshvad A, et al. Marginal Gap, Internal Fit, and Fracture Load of Leucite-reinforced Ceramic Inlays Fabricated By CEREC inLab and Hot-pressed Techniques. J Prosthodont. 2011;20(7):535-40. PubMed PMID: 21806704.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Marginal gap, internal fit, and fracture load of leucite-reinforced ceramic inlays fabricated by CEREC inLab and hot-pressed techniques. AU - Keshvad,Alireza, AU - Hooshmand,Tabassom, AU - Asefzadeh,Farokh, AU - Khalilinejad,Foroogh, AU - Alihemmati,Mohammad, AU - Van Noort,Richard, Y1 - 2011/08/01/ PY - 2011/8/3/entrez PY - 2011/8/3/pubmed PY - 2012/2/22/medline SP - 535 EP - 40 JF - Journal of prosthodontics : official journal of the American College of Prosthodontists JO - J Prosthodont VL - 20 IS - 7 N2 - PURPOSE: This in vitro study was designed to evaluate and compare the marginal gap, internal fit, and fracture load of resin-bonded, leucite-reinforced glass ceramic mesio-occlusal-distal (MOD) inlays fabricated by computer-aided design/manufacturing (CAD/CAM) or hot pressing. MATERIALS AND METHODS: Fifty caries-free extracted human molars were prepared for standardized MOD inlays. Impressions of each specimen were made and poured using type IV dental stone. Dies were randomly divided into two equal groups. Twenty-five ceramic inlays were fabricated by the hot-pressed technique using IPS Empress leucite-reinforced glass ceramics, and the other 25 ceramic inlays were produced by CAD/CAM technology using ProCAD leucite-reinforced ceramic blocks and CEREC inLab facilities. Inlays were bonded to the teeth using a dual-cured resin cement. The specimens were stored in distilled water at 37°C for 24 hours and then thermocycled for 5000 cycles. The marginal gap measurements were taken with a stereomicroscope. Specimens in each group of inlay systems were randomly divided into two subgroups of 10 and 15 specimens each. Ten specimens in each subgroup were sectioned mesiodistally for evaluation of the internal fit. The fracture load of specimens in the second subgroup (n = 15) of the two inlay systems was determined under compressive load in a universal testing machine. Data were analyzed using Student's t-test at a significance level of p < 0.05. RESULTS: The mean marginal and internal gap size in both IPS Empress and ProCAD inlays were less than 100 μm; however, the marginal gap for the IPS Empress restorations was significantly higher than that of ProCAD restorations (p < 0.05). There was no significant difference in the mean internal fit or the fracture load between the two glass ceramic inlays (p > 0.05). CONCLUSIONS: The leucite-reinforced glass ceramic inlay restorations fabricated by CEREC inLab (CAD/CAM) and the hot-pressed technique provided clinically acceptable marginal and internal fit with comparable fracture loads after luting. SN - 1532-849X UR - https://www.unboundmedicine.com/medline/citation/21806704/Marginal_gap_internal_fit_and_fracture_load_of_leucite_reinforced_ceramic_inlays_fabricated_by_CEREC_inLab_and_hot_pressed_techniques_ L2 - https://doi.org/10.1111/j.1532-849X.2011.00745.x DB - PRIME DP - Unbound Medicine ER -