Effect of curing distance for cure depth in composite resin

,; Malhotra, Shantun

doi:10.6026/973206300191353

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2023

DOI: 10.6026/973206300191353

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Effect of curing distance for cure depth in composite resin

Shantun Malhotra

Abstract: The effect of altering the distance between light tip and outer layer of composite (DLR) on the depth of composite cure with a range of low to high light intensity curing lamps and with different types of light unit is of interest. Three LED units (T= Freelight,U = Ultrablue IS, V = Coltolux LED, one PAC unit (S=PAC) and three halogen light-curing units (P = XL2500, Q = HelioluxVL, R = Visiolux) were analyzed. A human molar tooth that was separated mesio-distally to buccal and lingual halves was used to create… Show more

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2024

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Cited by 2 publications

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Evaluation of the influence of polymerization light intensity, irradiation time, and source distance on the depth of cure of resin based composite

Duratbegović,

Kobašlija,

Jakupović

et al. 2024

Balkan J Dent Med

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Background/Aim: To evaluate the effect of curing light parameters (intensity, duration, and distance of curing tip) on the depth of cure of conventional resin-based composite. Material and methods: Cylindrical specimens made of nanohybride resin-based composite are cured with 12 different curing protocols, combined with 3 different light intensities (300, 650, and 1100 mW/cm²), 2 distances of curing tip (0 and 8 mm), and 2 exposure times (20 and 40 seconds). The specimens were measured after scraping the uncured composite material according to the ISO 4049 standard. The depth of cure was calculated by dividing the length of the remaining composite by 2. Data were analyzed using: Levene's test and Multivariate Analysis-of-variance (MANOVA). The level of significance was set at P<0.05. Results: The highest depth of cure (3.332 mm) was observed for curing protocol 1100mW/cm²/0mm/40s. The lowest depth of cure had specimens cured with curing protocol 300 mW/cm²/8mm/20s (2.034mm). MANOVA showed a significant influence of the distance of the curing tip (P=0.014; P=0.001) regardless of light intensity and duration of exposure time. Exposure time was a significant factor (P=0.009) when cured from different distances. Although higher light intensity produced a higher depth of cure, light intensity was not a significant factor. Conclusions: The depth of cure can be increased by reducing the distance of the curing tip, when it is possible. At a distance of 8 mm, the depth of cure can be increased by a longer exposure time, regardless of curing light intensity.

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Evaluation of the influence of polymerization light intensity, irradiation time, and source distance on the depth of cure of resin based composite

Duratbegović,

Kobašlija,

Jakupović

et al. 2024

Balkan J Dent Med

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Depth of Cure of Resin-Based Composites Irradiated With Three Types of Light-Curing Units at Different Output Intensities

Okuse,

Nakamura,

Komatsu

et al. 2024

Cureus

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Aim Dental light-curing units (LCUs) are used at Matsumoto Dental University Hospital (MDUH). However, the time of installation of the same type of light irradiator varies, which affects the output intensity of the LCU. The purpose of this study was to evaluate the performance of LCU with different output intensities by comparing the depth of cure (DOC) of resin-based composites (RBCs). Materials and methods The output intensities of three types of LCUs, namely Pencure 2000(Morita, Osaka, Japan) , DC BlueLEX Plus (Yoshida, Tokyo, Japan), and Candelux (Morita, Osaka, Japan), were measured using a commercial dental radiometer, namely Bluephase Meter II (Ivoclar Vivadent, Schaan, Liechtenstein). The units with the highest and lowest output intensities were selected and used. The RBC, either Body A3 or Opaque A3 (Premise, Kerr, Brea, USA), was inserted into a cylindrical mold with an inner diameter of 4 mm and depth of 8 mm, and light irradiation was performed using an intervening polyester strip for 30 s. After removing the unpolymerized portions of the RBC from the mold with a plastic spatula, the long axis of the cured portion was measured with a digital caliper ( n =10). Results The highest DOC was observed when the RBCs were cured with Pencure 2000 at 1513 mW/cm 2 , the highest output intensity. The DOC was significantly greater when the LCU was positioned at 0 mm than at 8 mm from the RBC surface, and the DOC of Body A3 was greater than that of Opaque A3 ( p <0.05). Moreover, a positive correlation was observed between output intensity and DOC. The output intensity of LCUs in the same model also varied, which affected the DOC. Conclusion Increasing the output intensity at the tip of the light guide of the LCU also increased the DOC of the RBC. Increasing the irradiation distance from 0 mm to 8 mm decreased the DOC of the RBC. The DOC of the opaque-shade RBC was smaller than that of the body-shade RBC when curing was conducted with the same LCU.

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Effect of curing distance for cure depth in composite resin

Cited by 2 publications

References 20 publications

Evaluation of the influence of polymerization light intensity, irradiation time, and source distance on the depth of cure of resin based composite

Evaluation of the influence of polymerization light intensity, irradiation time, and source distance on the depth of cure of resin based composite

Depth of Cure of Resin-Based Composites Irradiated With Three Types of Light-Curing Units at Different Output Intensities

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