Effect of the thicknesses of bulk-fill composites on bonding strength

doi:10.7518/hxkq.2022.02.007

Abstract

Abstract: Objective

This work evaluated the effects of thickness on resin bonding strength.

Methods

We set the two bulk-fill composites Filtek Bulk Fill Posterior (FBF) and Tetric N-Ceram Bulk Fill (TBF) as the experimental groups and the two conventional composites Filtek Z100 (Z100) and Spectrum TPH (ST) as the control groups. The translucency parameter (TP), color difference, Vickers hardness (HV), and microtensile bond strength (μTBS) of dentine and the resin composites were measured at different depths.

Results

In each group, TP and HV decreased with the increase in thickness. At the same depth, the TP of the bulk-fill composites was higher than that of the conventional composites. At the same depth, the HV of the four different resin composites followed the order of Z100>FBF>TBF>ST (except for the upper surface). Except for FBF at 3 and 4 mm, all of the other groups showed no visible color change at all the tested thicknesses. Although the μTBS values of the four different composites obtained through the bulk-fill technique were lower than those of composites obtained through the incremental fill technique, the μTBS of the bulk-fill composites obtained through the bulk-filling technique can reach 30 MPa.

Conclusion

Bulk-fill composites applied in single 4 mm increments can meet the requirements of clinical application. However, the color stability of some bulk-fill composites cannot be maintained.

Key words: bulk-fill composite, adhesive, thickness, translucency parameter, Vickers hardness, microtensile bond strength

CLC Number:

R 783.1

Wang Ying, Yang Jiaxue, Xie Haifeng, Chen Chen. Effect of the thicknesses of bulk-fill composites on bonding strength[J]. West China Journal of Stomatology, 2022, 40(2): 169-174.

Figures/Tables 8

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材料	厂家	基质	填料
TBF	Ivoclar Vivadent公司，德国	Bis-GMA，UDMA	钡玻璃，氟化钇，氧化物，预聚合填料（79%~81%*）
FBF	3M ESPE公司，美国	Bis-GMA，Bis-EMA，UDMA	氧化锆/氧化硅，氟化钇（64.5%*）
Z100	3M ESPE公司，美国	Bis-GMA，TEGDMA	氧化锆，氧化硅（70%~80%*）
ST	Dentsply公司，德国	Bis-GMA，Bis-EMA，TEGDMA	硼、硅、铝玻璃（78%~79%*）

材料	厚度/mm
材料	1	2	3	4
ST	21.12±1.02^Aa	10.89±1.04^Bac	5.08±0.46^Ca	2.73±0.25^Da
Z100	15.26±0.57^Ab	8.30±0.27^Ba	3.05±0.57^Cb	1.74±1.54^Da
FBF	28.15±3.58^Ac	18.01±6.96^Bb	8.80±1.03^Cc	7.02±0.80^Db
TBF	24.24±4.90^Aac	13.07±0.45^Bc	7.26±0.96^Cc	5.25±0.86^Dc

材料	厚度/mm
材料	1	2	3	4
ST	0.5±0.2	1.3±0.3	1.2±0.1	1.0±0.2
Z100	2.1±0.1	1.5±0.3	2.3±0.3	1.5±0.2
FBF	0.9±0.5	2.3±0.2	5.4±0.3	7.6±0.3
TBF	3.1±0.2	1.2±0.4	1.2±0.3	1.4±0.3

材料	厚度/mm
材料	0	1	2	3	4
Z100	98.0±5.5^ABa	108.8±2.8^Ca	112.6±4.0^Ca	103.6±7.4^ACa	92.3±7.6^Ba
ST	55.9±5.3^Ab	62.9±3.7^Bb	61.1±2.5^ABb	56.6±4.3^Ab	57.1±2.8^Ab
FBF	58.7±3.8^Ab	73.4±4.1^Bc	74.6±3.8^Bc	73.2±2.2^Bc	73.6±2.5^Bc
TBF	61.6±2.6^Ab	68.7±2.1^Bd	63.3±3.2^Ab	60.8±2.3^Ab	57.3±2.4^Cb

充填方法	材料
充填方法	Z100	ST	TBF	FBF
分层充填	39.96±6.61^Aa	40.03±6.38^Aa	40.41±8.43^Aa	40.13±7.01^Aa
大块充填	10.07±8.52^Ab	13.86±8.49^Ab	34.15±4.19^Bb	34.35±5.65^Bb