Advertisements
February 2023 Abstracts
In
vitro elemental and micromorphological analysis of the resin-dentin
Ahmad Gamal Mohamed Raghip, bds, msc, John C. Comisi, dds, Hamdi H. Hamama, bds, msd, phd
Abstract: Purpose: To evaluate the bonding interface and the
remineralization potential of a bioactive restorative material on demineralized
dentin compared to a conventional bulk-fill resin composite restoration. Methods: Twelve caries-free human molars were used in this study. Specimens were
randomly divided into two groups according to the type of restorative material
used (n=12); an injectable resin-modified glass-ionomer restorative [Activa BioActive-Restorative
(ABR)] and a bulk-fill composite [3M Filtek One Bulk
Fill Restorative, (BFC)]. Each restored specimen was sectioned in two
semi-equal halves along the long axis of the teeth perpendicular to the resin
dentin interface with a water-cooled diamond disk at low speed. The
restoration-dentin interfaces were scanned under SEM to observe
micromorphological analysis; then an elemental analysis of the interface was
performed using an energy dispersive X-ray (EDX) spectroscopy. Results: Quantitative data were described using median (minimum and maximum) after
testing normality using the Shapiro-Wilk test. Mann-Whitney U test was used to
compare the BFC and ABR. Higher mean values of Ca were identified and related
to the ABR material, which provided more Ca ions than BFC. The comparison of Ca
and P between materials showed a significant difference in the amount of Ca
provided by ABR versus BFC. ABR restorations presented a thicker, and superior
remineralization interface compared to the bulk-fill resin composite (Am J
Dent 2023;36:3-7).
Clinical
significance: Activa BioActive Restorative
restorations presented a thicker and superior remineralization interface compared
to the bulk-fill resin composite.
Mail: Dr.
John C. Comisi, Department of Oral Rehabilitation.
Medical University of South Carolina, James B. Edwards College of Dental
Medicine, 173 Ashley Ave, BSB 548, MSC 507, Charleston SC 29425 USA. E-mail: comisi@musc.edu
Impact of
various clinical factors on the final color
Sebnem
Yilmaz, dds & Ferhan Egilmez, dds, phd
Abstract: Purpose: To evaluate the effect of material type, material
thickness and cement shade on the final color of two different
ceramic/glass-polymer-based CAD-CAM blocks over colored abutments. Methods: Tested blocks (Vita Enamic-VE and Cerasmart-Cs) were
cut in three different thicknesses (1, 1.5 and 2 mm), and cemented on two
different shaded (B1 and C3) resin discs with three shades (A2-Universal,
W-White, T-Translucent) of a self-adhesive resin cement. An additional 10
specimens were prepared for control (n= 370). 36 subgroups were formed to
simulate different clinical conditions (n= 10). The final color difference
(∆E00) was recorded as the difference between material-cement-resin
composite assembly and control specimens on a black background according to the
CIE∆E 2000 color difference formula. Clinical perceptibility (0.80) and
acceptability thresholds (1.80) were used to evaluate the results. Data were
analyzed using the Kruskal-Wallis and the Mann-Whitney U non-parametric tests
at P< 0.05 significance level. Results: ∆E00 results were influenced by the polymer-based CAD-CAM
material type, material thickness, and cement shade (P< 0.05) over both
abutment shades. VE exhibited lower ∆E00 values than Cs over
B1 and C3 shaded abutments (for each abutment P< 0.001). Specimens of 1 mm
thickness exhibited significantly higher ∆E00 than the 2 mm or
1.5 mm specimens (P< 0.001), and W cement shade demonstrated higher ∆E00 than T or A2 shades (P< 0.001) over both shaded abutments. (Am J Dent 2023;36:8-14).
Clinical significance: The final color of the
polymer-based CAD-CAM restoration can be improved by the suitable combination
of material/material thickness/cement shade to achieve the desired esthetic
outcomes within clinically acceptable limits. Regardless of the type of polymer-based
CAD-CAM material chosen, at least 1.5 mm restoration thickness with the use of
Translucent or A2 cement shade is recommended for masking whitened or darkened
shaded abutment teeth in clinical practice.
Mail: Dr. Ferhan Egilmez, Mutlukent Mah. 10, Cadde
2065, Sk. No: 15, Beysukent, Ankara, Turkey. E-mail:
ferhanegilmez@gmail.com, fegilmez@gazi.edu.tr
Suhani Maheshwari, mds, Gurparkash Singh Chahal, mds, Vishakha Grover, mds, Manish Rathi, md, dm,
Abstract: Purpose: To evaluate the role of improvement in inflammatory
oxidative stress by periodontal therapy (NSPT) in chronic kidney disease (CKD)
subjects. Methods: 50 stable subjects of CKD (stage III-IV) and having
chronic periodontitis were enrolled for the present study. Group A (control
group) subjects who did not receive NSPT and Group B (test group) subjects who
received NSPT. Oral hygiene instructions were given to both groups,
malondialdehyde (MDA) in gingival crevicular fluid (GCF) and serum, albumin
creatinine ratio (ACR), urine protein creatinine ratio (UPCR), pocket depth
(PD), clinical attachment loss (CAL), plaque index (PI), gingival index (GI),
Interleukin 1-beta (IL-1β), high sensitivity C-reactive protein (hs-CRP) in serum were assessed at baseline and 6 months. Results: There was a significant difference observed in PD, CAL, PI, GI and MDA-GCF, hs-CRP, IL-1β in serum following NSPT in the test
group compared to the control group at 6 months follow up. Within the
limitations of the study, the results revealed that NSPT can be used as an
effective method to reduce inflammatory oxidative stress in CKD subjects and
improve renal health. Further well-designed longitudinal trials with larger
sample size and longer follow ups are needed. (Am J Dent 2023;36:15-20).
Clinical
significance: The non-surgical periodontal
intervention showed statistically significant improvement on oxidative and
inflammatory stress markers in gingival crevicular fluid and serum in subjects
suffering from chronic kidney disease which suggests that periodontal treatment
may be beneficial for these subjects.
Mail: Dr Ashish Jain, Dental
Institute, Rajendra Institute of Medical Sciences, Ranchi, India. E-mail:
ajain.pu@gmail.com
Efficacy of
one-time application of low-level laser therapy in the
management of complications after third molar surgery:
Daniela
Prudente, dmd, Fabien Hauser, dmd, Gérald Mettraux, dmd, Enrico Di Bella, phd & Ivo Krejci, dmd
Abstract: Purpose: To evaluate in a retrospective practice-based clinical
study, the effects of additional laser therapy on side effects following the
removal of all four impacted third molars. The secondary objective was, based
on those results, to rationalize a protocol for low-level laser therapy (LLLT)
in terms of irradiation settings. Methods: 96 subjects requiring simultaneous surgical removal of the four third
molars were treated from 2017 to 2019. For each subject, one side was randomly
assigned to laser treatment, the other receiving the placebo. LLLT was
performed by applying an infrared diode laser of 810 nm. In the LLLT irradiated
side of the mouth, three groups were randomly assigned to a specific protocol
of irradiation. Controllable settings include power, energy density and also scanning
technique. The main outcome was pain, registered on a visual analog scale (VAS)
performed by the patients. Results: There was a statistically significant difference for one of the tested
protocols. Self-reported annoyance and pain scores were lower for the side
submitted to a 30-second laser radiation at a power of 0.3 W with the slow
scanning technique (P< 0.05). (Am J
Dent 2023;36:21-24).
Clinical significance: The present treatment approach,
using a one-time low-level laser therapy intra-oral application, showed a
beneficial effect of LLLT reducing pain after third molar surgery, which should
be confirmed through further study.
Mail: Dr. Daniela Prudente, Division
of Cariology and Endodontology, School of Dental Medicine, University of
Geneva, 1 rue Michel-Servet, 1211 Geneva, Switzerland. E-mail: daniela.prudente@unige.ch
Effect of whitening mouthrinses on color change, whiteness change,
Muhammet Fidan, dds & Makbule Tugba Tuncdemir, dds, phd
Abstract: Purpose: To evaluate the effect of whitening mouthrinses on the color change, whiteness change, surface roughness, and hardness of
stained resin composites after different immersion times. Methods: Three different resin composites (Estelite Σ Quick, G-Aenial Anterior, Omnichroma)
were used to prepare a total of 90 samples (30 samples from each resin composite).
The samples were kept in coffee for 12 days, then divided into three subgroups
(Control, Crest 3D White, and Listerine Advanced White; n=10 each). Color
change (ΔE00) and whiteness change (ΔWID) were evaluated
at time intervals of 0-24 hours (T0-T1), 0-72 hours (T0-T2), and 24-72 hours
(T1-T2). Surface roughness and hardness values were evaluated at T0, T1, and T2
after immersion in mouthrinses. Two-way ANOVA (for
color and whiteness changes) and generalized linear model (for surface
roughness and hardness) were used for data analyses (P< 0.05). Results: Omnichroma had the highest value for color change with Crest 3D White during T0-T1 and T0-T2.
Crest 3D White showed better color changes than Listerine Advanced White. In
all composites and mouthrinse groups, the highest and
lowest values of ΔWID were at T0-T2 and T1-T2, respectively, with the
highest value for Omnichroma with Crest 3D White at
T0-T2 and the lowest for G-Aenial Anterior with
control groups at T1-T2. The highest roughness values were found with the Omnichroma at T2. Whitening mouthrinses significantly increased roughness and decreased hardness compared to baseline. (Am J Dent 2023;36:25-30).
Clinical significance: Short-term regular use of
whitening mouthrinse can recover color and increase
the perception of whiteness without any significant increase in the roughness
or hardness of resin composites, while long-term use affects both the roughness
and hardness of resin composites.
Mail: Dr. Muhammet Fidan, Department
of Restorative Dentistry, Faculty of Dentistry, Usak University, Usak, 64200, Turkey. E-mail: muhammetfidan93@gmail.com
Evolution of roughness and optical properties of
resin composites submitted
Eduardo Moreira da Silva, dds, msc, phd, Juliana Nunes da Silva Meireles Dória Maia,
dds, msc, phd,
& José Guilherme Antunes Guimarães, dds,
msc, phd
Abstract: Purpose: To evaluate the effect of cycling
whitening toothpaste with cigarette smoking (WTCS) on the evolution of
roughness, color, translucency, and gloss of microfilled, microhybrid, and nanofilled resin composites. Methods: 15
specimens of Durafill - DVS, Empress Direct - ED, and
Z350 - FZ were divided into three groups according to the toothpastes:
conventional, control group, (Colgate - C) and Whitening (Colgate Luminous
White–CW and Oral B 3D White - OW) and roughness, color, translucency, and
gloss were evaluated before and after the specimens were submitted to WTCS for
8 weeks. Data were analyzed by two-way ANOVA, 3-way repeated measures ANOVA,
and Tukey HSD post hoc test (α= 0.05). Results: Only ED and FZ brushed with CW and FZ brushed with C
presented an increase in roughness after WTCS. The three composites suffered a
significant color alteration after WTCS. Excepting DVS brushed with CW, all the
other groups presented a significant reduction in translucency after WTCS. DVS
was the only resin composite that maintained its gloss stability after WTCS.
Whitening toothpastes behaved similarly to conventional (control) toothpaste
regarding the evolution of roughness and optical stability of the three resin
composites. (Am J Dent 2023;36:31-38).
Clinical significance: Whitening toothpastes were not
capable of maintaining the color stability of the three resin composites after 8
weeks of toothpastes-cigarette smoking cycling.
Mail: Dr.
Eduardo Moreira da Silva, Faculty of Dentistry, Fluminense Federal University,
Rua Mário Santos Braga nº 30, Centro, Niterói, RJ, CEP 24040-110, Brazil. E-mail: em_silva@id.uff.br
Comparison of the light transmission of new
generation
Ege Koseler, dds, Kubra Degirmenci, dds & Serkan Saridag, dds, phd
Abstract: Purpose: To compare the effects of different thicknesses of
ceramic veneering on the light transmission of various monolithic zirconia and
lithium disilicate materials used in esthetic restorations. Methods: Zirconia (i.e., Katana UT,
Katana HT, Prozir Diamond, Prozir HT, and Zenostar MO) and lithium disilicate specimens
(i.e., Emax HT and Emax MO) were prepared at thicknesses of 0.5 mm, 0.8 mm, and
1.2 mm. Additionally, 0.8 mm-thick specimens and 0.3 mm-thick ceramic veneer
were prepared for veneering groups. The total transmittance of light values
were measured using a spectrophotometer. The light transmission values were
analyzed using the Kruskal-Wallis and the post-hoc Dunnett tests (α= 0.05). Results: The Emax HT group defined
significant differences from all groups (P< 0.05) at all thicknesses. The
mean total transmittance of light ranged from 5.53% to 19.55%. There was no
significant difference between the Katana UT and Prozir Diamond groups at the 0.5 mm, 0.8 mm, and 1.2 mm thicknesses (P> 0.05). (Am J Dent 2023;36:39-43).
Clinical significance: The results of this study showed
no significant effects of veneering ceramic on the light transmittance of the
specimens at a thickness of 0.8 mm. Novel monolithic zirconia materials may be preferred
over porcelain veneering in 0.8 mm-thick restorations, as the esthetic
appearance of the restorations would not change.
Mail: Dr. Kubra Degirmenci, Department of Prosthodontics, Faculty of
Dentistry, Bolu Abant İzzet Baysal University, Bolu,
Turkey. E-mail: dtkubradegirmenci@outlook.com
A systematic scoping review of color evaluation
methods
Moan Jéfter Fernandes Costa, dds, msc, Isabela Dantas Torres de Araújo, dds, msc,
Abstract: Purpose: This systematic scoping review
aimed to survey the literature to answer the following questions: which
instruments were used to measure the color change; which teeth were assessed
for color; what was the follow-up period, and in which country was the recently
published tooth bleaching clinical trial performed? Methods: This research was registered in the Open Science
Framework. The following databases were searched: PubMed, Scopus, Web of
Science, EMBASE, Cochrane Library, and LILACS. Randomized clinical trials
evaluating tooth bleaching with color change analysis, published between 2021
and 2017, were included. The data extracted from included studies were analyzed
using a qualitative and descriptive analysis. Results: 106 articles were analyzed. Most studies used only ∆Eab to measure the color change (10.4%),
assessed the color change in the maxillary central incisors (45.3%), and
included a one-month follow-up (25.4%). The published papers were mostly from research
performed in Brazil (51.9%). Many methods have been used in the tooth bleaching
clinical trials examined, and a wide variety of instruments used to measure the
color change was observed. (Am J Dent 2023;36:44-52).
Clinical significance: The large variation in the
methodology criteria of most recent tooth bleaching clinical trials makes data
comparison difficult among different studies and raises the need for a
guideline for tooth bleaching clinical studies.
Mail: Dr.
Boniek Castillo Dutra Borges, Av. Sen. Salgado Filho, 1787, Lagoa Nova,
Natal-RN, zip code: 59056-000, Brazil. E-mail:
boniek.castillo@gmail.com
