Wear assessment of current aesthetic crowns compared with human enamel after two finishing procedures: In vitro study

Shaaban, Ahmed Mohamed; Naggar, Gihan Abd El Hady Al; Nabil, Rasha; Rashad, Mohamed; Attia, Y

doi:10.12688/f1000research.18653.1

Cited by 1 publication

(1 citation statement)

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“…A computer numerical control (CNC) (CNC Premium 4820-i-mes, Germany) unit was used to standardize teeth preparation to receive a full-coverage crown (9) .The Preparation design was round shoulder finish line with thickness 1 mm, flat occlusal surface, 20º total convergence, and 4 mm high.…”

Section: Methodsmentioning

confidence: 99%

Microleakage of Temporary Crowns with Different Cement gap

Elbieh

Othman

Haggag

2021

Al-Azhar Journal of Dental Science

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Objective: To evaluate the effect of different cement gap on microleakage of PMMA crowns cemented with resin cement. Materials and Methods: Thirty natural human molar teeth were collected, the root of the teeth was sealed with a double layer of varnish for insulation to a level of 1 mm below the preparation margin, and mounted in an acrylic mold. Teeth were prepared through CNC, PMMA crowns fabricated by CAD/CAM. Samples were divided into 3 subgroups according to the cement gap (CG) (n=10): 25µm (CG25), 50µm (CG50), 100µm (CG100). PMMA crowns cemented with Breeze Self-Adhesive Resin Cement. Samples were thermocycled for 5000 cycles between two water baths at 5°C and 55°C with a dwell time of 20 seconds and 10 seconds of transfer time. Samples were immersed in methylene blue dye solution for 24 hours, then sectioned buccolingually. Dye penetration was assessed using a spectromicroscope, and then a score assessment was done for the microleakage. Results: The CG50 group scored the lowest median microleakage score, followed by CG100, and finally, CG25. The CG25 group; showed a statistically significantly higher median microleakage score than CG50 or CG100 groups. Conclusion: The cement gap has an effect on the microleakage of PMMA crowns cemented with self-adhesive resin cement.

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Section: Methodsmentioning

confidence: 99%