HA011 - Hatton
Área: 7 - Imaginologia

Objective assessment of the combined effect of exomass-related and motion artefacts in Cone beam CT
Candemil A P, Oliveira ML, Freitas DQ, Haiter Neto F, Wenzel A, Spin Neto R
Odontologia Restauradora - UNIVERSIDADE DE SÃO PAULO - RIBEIRÃO PRETO
Conflito de interesse: Não há conflito de interesse

The aim of this study was to assess the combined effect of cone-beam computed tomography (CBCT) exomass-related and patient motion artefacts. A cylindrical phantom containing 21 tubes filled with a radiopaque solution, allowing the inclusion of three titanium implants in the periphery to induce exomass-related artefacts, was mounted on a robot simulating 0.75-, 1.50-, and 3-mm movements (nodding/lateral rotation/tremor). CBCT images with/without exomass and with/without movements were acquired, in duplicate, in three units. Voxel value mean and standard deviation were assessed from each tube. For each CBCT volume, the 21 mean voxel values were averaged providing the overall mean voxel value (OMVV), and the standard deviation was calculated providing overall voxel value inhomogeneity (OVVI). The standard deviation from each of the 21 volumes-of-interest were averaged, providing overall image noise (ON). OMVV, OVVI, and ON were averaged for the duplicate acquisitions. The effect of the diverse tested conditions was inferred from a repeated-measures analysis of variance, followed by Sidak's test (α=0.05). Images acquired with exomass had lower OMVV, and higher OVVI and ON. Movement artefacts aggravated exomass-related alterations. OMVV and OVVI were mostly affected by 3-mm nodding movements. Motion-artefact correction was effective.
In conclusion, CBCT images are altered by exomass-related artefacts, and this finding is aggravated in the presence of motion artefacts. Motion-artefact correction eliminated the impact of movement.
(Apoio: CAPES  N° 001  |  Pró-Reitoria de Pós-Graduação at UNICAMP  N° 11/2019)

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HA015 - Hatton
Área: 8 - Periodontia

Interactions between hemodialysis vintage with xerostomia and tooth loss on oral health-related quality of life
Oliveira LM, Schöffer C, Santi SS, Antoniazzi RP, Zanatta FB
Estomatologia - UNIVERSIDADE FEDERAL DE SANTA MARIA
Conflito de interesse: Não há conflito de interesse

The aim of the present cross-sectional study was to evaluate whether tooth loss and xerostomia are independently associated with oral health-related quality of life (OHRQoL) in individuals with end-stage renal disease (ESRD) and whether hemodialysis vintage (HV) modifies the effect of these associations. One hundred eighty adults with ESRD were assessed by calibrated examiners. Oral examinations were performed for untreated dental caries, periodontitis, tooth loss (≤ 8 or > 8 teeth) and xerostomia (absent or present). HV was determined using hospital records and categorized as ≤ 12, 13-72 or ≥ 73 months. OHRQoL was assessed using the simplified version of the Oral Health Impact Profile (OHIP14) questionnaire. Adjusted multivariate negative binomial regression analysis was used to calculate the rate ratio (RR) of OHIP14 scores according to the exposures of interest and interactions with HV. In the adjusted model, xerostomia and tooth loss were significantly associated with poorer OHRQoL. Moreover, longer HV (≥ 73 months) negatively modified the effect of the associations between the exposures [xerostomia (RR = 2.96; 95% CI: 1.48 to 5.90); tooth loss (RR = 4.13; 95% CI: 2.00 to 8.51)] and outcome.
Xerostomia and tooth loss exert an influence on OHRQoL in individuals with end-stage renal disease, with a greater impact found among those on hemodialysis for a longer period of time. Policy makers should consider the greater impact of oral conditions on OHRQoL in extended HV by giving additional priority to patients on long-term pretransplant hemodialysis.
(Apoio: CAPES  N° 001)

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