Banca de QUALIFICAÇÃO: LAÍSA DANIEL GONDIM

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : LAÍSA DANIEL GONDIM
DATE: 16/06/2021
LOCAL: Por meio de videoconferência
TITLE:
KEY WORDS:

cone-beam computed tomography, diagnosis, tooth fracture; root canal
filling materials; artefacts

PAGES: 41
BIG AREA: Ciências da Saúde
AREA: Odontologia
SUMMARY:

Vertical root fracture (VRF) is a clinical condition that is difficult to identify. Because of
the longitudinal direction of this type of fracture, sometimes the diagnosis is only
possible with three-dimensional images. However, the image quality of the cone
beam computed tomography (CBCT) and, consequently, its accuracy in the
diagnosis, is influenced by the presence of intracanal materials and the exposure
parameters such as the milliamperage. Thus, the objective of the present study was
to evaluate the effect of milliamperage in the diagnosis of VRFs in teeth with different
intracanal materials, using CBCT images. Twenty uniradicular teeth, 10 containing
VRFs and 10 controls, were used. Each tooth was exposed four times, to form the
following subgroups: control (without material), gutta percha, metallic pin and
fiberglass pin. The Veraviewepocs 3D R100 scanner was used for the image
acquisition and all teeth were exposed in two protocols, one with 90kvp, 4mA, field of
view 4cm x 4cm, voxel 0.125mm and the other with a decrease in milliampere to 1
mA. Three radiologists evaluated the images for image quality and the presence of
fracture, using a 5-point scale. The area under the Receiver Operating Characteristic
curve (Az), sensitivity and specificity were calculated considering intracanal materials
and milliamperage. The ANOVA test compared the intracanal materials in each
protocol, while the Student T test, the diagnostic values between the mAs for each
materials. The significance level was 5%. The milliamperage did not influenced the
image quality and Az values, sensitivity and specificity for any of the intracanal
materials (p> 0.05), except for the group containing fiberglass pin (p <0.05).
Sensitivity and specificity, were higher and lower, respectively, when compared to the
group metallic pin with gutta percha and the control (without material) (p <0.05). The
intra-examiner reproducibility was substantial (0.721; 0.742) and the inter-examiner
moderate (0.476; 0.431), respectively, for the diagnosis of VRF and image quality. In
conclusion, is possible to reduce the milliamperage (4-1mA) without a significant
reduction in the image quality and the area under the curve (Az) in the detection of
vertical root fractures in CBCT images.

BANKING MEMBERS:
Externa à Instituição - DANIELA PITA DE MELO
Presidente - 1552665 - MARIA LUIZA DOS ANJOS PONTUAL
Externa à Instituição - MONIKELLY DO CARMO NASCIMENTO MARCHINI