Characterization and comparative analysis of voids in class II composite resin restorations by optical coherence tomography
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Operative Dentistry
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Purpose: This study aimed to characterize and
analyze the number of voids and the percentage
of void volume within and between the layers of class II composite restorations made
using the bulk fill technique or the incremental
technique by optical coherence tomography
(OCT).
Methods and Materials: Class II cavities (43432
mm) were prepared in 48 human third molars
(n=24 restorations per group, two class II
cavities per tooth). Teeth were divided into
four groups and restored as follows: group 1
(FOB), bulk filled in a single increment using
Filtek One Bulk Fill (3M Oral Care); group 2
(FXT), incrementally filled using four oblique
layers of Filtek Z350 XT (3M Oral Care); group
3 (FBF+FXT), bulk filled in a single increment
using Filtek Bulk Fill Flowable Restorative
(3M Oral Care) covered with two oblique layers
of Filtek Z350 XT (3M Oral Care), and group 4
(FF+FXT), incrementally filled using Filtek
Z350 XT Flow (3M Oral Care) covered with
two oblique layers of Filtek Z350 XT (3M Oral
Care). After the restorative procedure, specimens
were immersed into distilled water and
stored in a hot-air oven at 378C. Forty-eight
hours later, thermal cycling was conducted
(5000 cycles, 58C to 558C). Afterward, OCT was
used to detect the existence of voids and to calculate the number of voids and percentage
of voids volume within each restoration. Data
were submitted to chi-square and Kruskal-
Wallis tests (a=0.05). Comparisons were made
using the Dunn method.
Results: Voids were detected in all groups,
ranging from 0.000002 (FBF+FXT and FF+FXT)
to 0.32 mm3 (FBF+FXT). FF + FXT presented
voids in all of the restorations and had a
significantly higher number of voids per restoration
when compared to the other groups
(p,0.05), but restorations with the presence of
voids were significantly higher only when
compared to FXT (p,0.05). FBF + FXT presented
a significantly higher percentage of voids
volume than that of FXT (p,0.05). When comparing
restorations made using high-viscosity
resin-based composites (FOB and FXT), no
significant differences regarding number of
voids or percentage of voids volume were
detected (p 0.05).
Conclusions: The use of flowable resin-based
composites can result in an increased number
of voids and percentage of voids volume in
restorations, and this appears to be more
related to voids present inside the syringe of
the material than to the use of incremental or
bulk fill restorative techniques.
Como referenciar
PARDO DIAZ, C.A.; SHIMOKAWA, C.A.K.; SAMPAIO, C.S.; FREITAS, A.Z.; TURBINO, M.L. Characterization and comparative analysis of voids in class II composite resin restorations by optical coherence tomography. Operative Dentistry, v. 45, n. 1, p. 71-79, 2020. DOI: 10.2341/18-290-L. Disponível em: http://repositorio.ipen.br/handle/123456789/31078. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.