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1.
Nan Fang Yi Ke Da Xue Xue Bao ; 40(8): 1165-1171, 2020 Aug 30.
Artículo en Chino | MEDLINE | ID: mdl-32895182

RESUMEN

OBJECTIVE: To investigate the effect of orthodontic traction on the microstructure of dental enamel. METHODS: Forty-eight isolated premolars were randomly divided into 6 groups (n=8), including Group A (blank control group), in which the teeth were bonded with the orthodontic brackets without any loading force; Groups B1, B2, and B3 where the teeth were bonded with the orthodontic brackets using clinical adhesives and loaded with 50 g force for 6 months, 200 g force for 6 months, and 200 g force for 1 month, respectively; and Groups C1 and C2, where the teeth were bonded with straight wire brackets using light curing bonding and chemical curing bonding techniques, respectively. All the teeth were embedded with non-decalcified epoxy resin. Scanning electron microscope (SEM), atomic force microscope (AFM), and energy spectrometer (EDS) were used to analyze interface morphology and elemental composition of the teeth sliced with a hard tissue microtome. RESULTS: Compared with those in Group A, the teeth in the other 5 groups showed increased adhesive residue index with microcracks and void structures on the enamel surface under SEM; AFM revealed microcracks on the enamel surface with angles to the grinding direction. A larger loading force on the bracket resulted in more microcracks on the enamel interface. The interface roughness differed significantly between Groups A and C2, and the peak-to-valley distance differed significantly between Groups A, C, and C2. CONCLUSIONS: Orthodontic traction can cause changes in the microstructure of normal dental enamel.


Asunto(s)
Esmalte Dental , Ensayo de Materiales , Soportes Ortodóncicos , Cementos de Resina , Propiedades de Superficie , Tracción
2.
Oral Health Prev Dent ; 18(4): 701-706, 2020 Sep 04.
Artículo en Inglés | MEDLINE | ID: mdl-32895652

RESUMEN

PURPOSE: To evaluate the effects of stomach and duodenal fluid on enamel surfaces, simulating the action of refluxed liquid in patients with duodenogastric reflux. METHODS AND MATERIALS: Forty bovine incisors were used to obtain enamel fragments. Only half of the enamel surface was exposed to erosive challenges; the samples were then randomly divided into the following four groups (n = 10): G1: HCl; G2: HCl + pepsin; G3: HCl + ox bile + NaHCO3; and G4: HCl + pancreatin + NaHCO3. The specimens were placed in 37°C solutions, six times per day, for 20 s, over a period of 5 days and then analysed for morphology, surface roughness and the step formed on the dental enamel using confocal laser microscopy. The data were analysed using the Kruskal-Wallis and Dunn's test (p <0.05). RESULTS: Both analyses revealed a higher step and surface roughness for the G3 group (5.6 µm ± 1.69, 2.2 µm ± 1.61), which were statistically significant compared with the G1 and G2 groups (3.9 µm ± 1.5 µm; 1.0 µm ± 0.18; 3.7 µm ± 1.45; and 0.9 µm ± 0.12) (p <0.05); only the step in the G4 group (4.9 µm ± 1.8 µm) was similar to that of the G3 group (p >0.05). Morphological analysis showed greater structural loss in the G3 and G4 groups. CONCLUSIONS: Bile and pancreatin, in combination with hydrochloric acid, may promote a greater loss of structure, increased surface roughness and loss of enamel prismatic anatomy.


Asunto(s)
Reflujo Duodenogástrico , Erosión de los Dientes , Animales , Bovinos , Esmalte Dental , Humanos
3.
Oral Health Prev Dent ; 18(4): 741-746, 2020 Sep 04.
Artículo en Inglés | MEDLINE | ID: mdl-32895657

RESUMEN

PURPOSE: To verify the prevalence of developmental defects of enamel (DDE) in deciduous teeth and analyse the association with adverse events that occurred during pregnancy and early childhood. MATERIALS AND METHODS: In a cross-sectional study, 152 children with an average age of 3.57 ± 1.25 years were examined according to the criteria established by the DDE index. A previously validated questionnaire was given to mothers in order to obtain information regarding: calcium and vitamin D deficiency (measured in mothers); gestational diabetes; gestational undernutrition; weight at birth; neonatal hypoxia; and presence of asthma in early childhood. The clinical exam was conducted by a single examiner calibrated for visual exams (Kappa = 0.84), outdoors on patios of schools with children and examiner knee to knee. Pearson's chi-squared test and Fisher's Exact Test (p < 0.05) were used to determine statistically significant associations between the variables in study. The data were then analysed using a binary logistic regression regression. RESULTS: 26.3% of children exhibited DDE. It was possible to verify a statistically significant association between DDE and vitamin D deficiency (p < 0.01), calcium deficiency (p = 0.01), neonatal hypoxia (p = 0.026), and gestational diabetes (p = 0.04). The regression model allowed the conclusion that children who had neonatal hypoxia during childbirth, gestational diabetes or vitamin D deficiency during their gestation were 3.54, 12.47 and 6.40 more likely to exhibit signs of DDE, respectively. CONCLUSION: The prevalence of DDE was considered high and was associated with vitamin D and calcium deficiency during pregnancy, gestational diabetes, and neonatal hypoxia.


Asunto(s)
Hipoplasia del Esmalte Dental , Niño , Preescolar , Estudios Transversales , Esmalte Dental , Femenino , Humanos , Madres , Embarazo , Prevalencia , Diente Primario
4.
Oral Health Prev Dent ; 18(4): 747-756, 2020 Sep 04.
Artículo en Inglés | MEDLINE | ID: mdl-32895658

RESUMEN

PURPOSE: This in vitro study evaluated the effectiveness of polyacrylic acid as an acid etchant similar to phosphoric acid and its effect on the microtensile bond strength of self-adhesive resin cement to enamel. MATERIALS AND METHODS: Ninety Te-Econom Plus resin blocks (11 x 4 mm) were cemented onto bovine enamel and distributed into 10 groups according to the surface treatments (no surface treatment; etching with 37% phosphoric acid; etching with 20% polyacrylic acid; etching with 37% phosphoric acid + dental adhesive, and etching with 20% polyacrylic acid + dental adhesive) and the self-adhesive resin cements used (RelyX U200 and MaxCem Elite) (n = 9). After bonding, the specimens were sectioned into sticks, subjected to thermocycling (5760 cycles, 5°C and 55°C) and microtensile bond strength testing (n = 6). Images of representative specimens were obtained using a scanning electron microscope. Enamel penetration evaluation of different surface treatments was analysed by confocal laser scanning microscopy (n = 3). Data on bond strength were subjected to 2-way ANOVA and Tukey's least significant difference test (α = 0.05). RESULTS: Both 37% phosphoric acid and 20% polyacrylic acid yielded the same microtensile bond strength between self-adhesive resin cement and enamel, independent of the application of dental adhesives (p > 0.05). MaxCem Elite showed higher bond strength values than RelyX U200 just for the 20% polyacrylic acid group (p = 0.001). CONCLUSION: Acid pre-conditioning of dental enamel may influence the bond strength of self-adhesive resin cement to enamel, and 20% polyacrylic acid showed efficacy similar to that of 37% phosphoric acid.


Asunto(s)
Recubrimiento Dental Adhesivo , Cementos de Resina , Grabado Ácido Dental , Resinas Acrílicas , Animales , Bovinos , Resinas Compuestas , Cementos Dentales , Esmalte Dental , Análisis del Estrés Dental , Ensayo de Materiales , Microscopía Electrónica de Rastreo , Propiedades de Superficie , Resistencia a la Tracción
5.
Oral Health Prev Dent ; 18(4): 793-798, 2020 Sep 04.
Artículo en Inglés | MEDLINE | ID: mdl-32895663

RESUMEN

PURPOSE: To determine the prevalence of developmental defects of the enamel (DDE) in premolars whose infected predecessors were submitted to pulp therapy with antibiotic paste or extractions due to pulp necrosis. MATERIALS AND METHODS: A cross-sectional study with a consecutive sample consisting of children and adolescents who presented with fully erupted premolars, was evaluated. Data were collected by dental examinations, in which the modified DDE index was applied. Dental records were evaluated and three groups of premolars were determined according to the clinical history of predecessors: GCTZ: with pulp necrosis and treated with CTZ (chloramphenicol, tetracycline, zinc oxide and eugenol) paste; GE: with pulp necrosis and treated by extraction; GH: healthy and physiologically exfoliated. Descriptive analysis and a logistic regression (p <0.05) were performed. RESULTS: The study included 1017 premolars, DDE was present in 22.5%. Premolars belonging to the GE group presented higher odds of DDE (odds ratio (OR) = 3.52, 95% CI:2.29-5.40) than those of GCTZ group (OR = 2.43, 95% CI:1.51-3.91) and GH group (p <0.01). Enamel defects were more frequent in maxillary premolars (OR = 3.22, 95% CI:1.65-6.27, OR = 3.39, 95% CI:1.67-6.90, OR = 2.90, 95% CI:1.48-5.66 and OR = 3.10, 95% CI:1.54-6.23). CONCLUSIONS: The prevalence of enamel defects was higher in premolars whose predecessors were removed because of necrosis, followed by those treated with CTZ paste and those that were healthy by the time exfoliation occurred.


Asunto(s)
Antibacterianos/uso terapéutico , Esmalte Dental , Adolescente , Diente Premolar , Niño , Estudios Transversales , Humanos , Prevalencia
6.
Oral Health Prev Dent ; 18(4): 807-814, 2020 Sep 04.
Artículo en Inglés | MEDLINE | ID: mdl-32895665

RESUMEN

PURPOSE: To investigate whether toothpastes with diamond powder vs those with traditional abrasives abrade dentin and enamel differently and to determine the relative dentin abrasivity (RDA) and relative enamel abrasivity (REA) values of those toothpastes. MATERIALS AND METHODS: Dentin and enamel samples of bovine permanent incisors were randomly allocated into groups of eight, brushed with 20 different toothpastes (three of which contained diamond powder) and analysed for their RDA and REA values. RESULTS: Toothpastes with diamond powder exhibit low RDA values but high REA values. Some RDA values exceeded the ones declared by the manufacturer. CONCLUSION: Diamond powder as an abrasive might have a mild action on dentin, but it is highly abrasive on enamel.


Asunto(s)
Abrasión de los Dientes , Pastas de Dientes , Animales , Bovinos , Esmalte Dental , Dentina , Diamante , Cepillado Dental
7.
Quintessence Int ; 51(9): 696-709, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32901234

RESUMEN

OBJECTIVES: To evaluate masking effects of resin infiltration on labial white spot lesions (WSL), by comparing the latter with a remineralization approach (using hydroxyapatite and fluorides) and conventional oral care (using fluoride-free toothpaste). METHOD AND MATERIALS: Fifteen patients with at least three WSL were enrolled for a within-person randomized controlled trial, thus allowing for intrapersonal comparisons. Each WSL per tooth in every patient was randomly assigned to one of the following groups. Group 1: lesions were resin-infiltrated with Icon (RI; DMG); Group 2: Remin Pro (RP; VOCO) was used as remineralizing agent; and Group 3 (control): affected teeth were brushed with Complete Care toothpaste (CC; Himalaya). RP and CC were applied by means of a polishing brush, using a low-speed handpiece (5 min), and these procedures were repeated chairside thrice daily for 7 consecutive days. Digital photographs were captured before and after lesion treatment under standardized conditions. The CIE L*a*b* color system was used to analyze the optical outcome, and intrapersonal color differences were statistically evaluated. RESULTS: Compared to RP and CC, RI showed prompt and subjectively satisfactory color improvements, and this was primarily driven by L* and b* shifts. Statistical analysis of the objective color differences (ΔE*) between the three groups revealed significant differences for RI vs RP (P = .029), RI vs CC (P < .001), and RP vs CC (P = .001). CONCLUSION: Resin infiltration is considered a time-effective treatment option for esthetically camouflaging WSL, while RP and CC failed to improve lesion appearance and oral health in the current short-term trial.


Asunto(s)
Caries Dental , Salud Bucal , Esmalte Dental , Humanos , Boca , Resinas Sintéticas
8.
Braz Dent J ; 31(4): 423-430, 2020 Sep 04.
Artículo en Inglés | MEDLINE | ID: mdl-32901720

RESUMEN

The aim of this study was to assess the effect of a newly developed nanocomplex formed of hydroxypropyl-b-cyclodextrin and 1% titanium tetrafluoride (TiF4) after distinct complexation periods (12/72 h) on demineralization of bovine enamel in vitro. Enamel blocks (n=60) were allocated in different groups: Mili-Q water, hydroxypropyl-b-cyclodextrin, 1% TiF4, hydroxypropyl-b-cyclodextrin + 1% TiF4 after 12 h of complexation and hydroxypropyl-b-cyclodextrin + 1% TiF4 after 72 h of complexation. The samples were evaluated by surface microhardness, cross-sectional microhardness and micro-CT. Scanning electron microscopy and energy dispersive X-ray spectrometry (SEM/EDX) were also obtained. Hydroxypropyl-b-cyclodextrin + 1% TiF4 after 12 h complexation resulted in lower percentage of surface microhardness loss compared to Mili-Q water, hydroxypropyl-b-cyclodextrin, 1% TiF4 and hydroxypropyl-b-cyclodextrin + 1% TiF4 after 72 h of complexation group, with a large effect size (from 1.307 to 2.943) and high power (84.9 to 99%). All groups resulted in similar integrated mineral loss (ΔZ) obtained by both internal microhardness and micro-CT techniques. Enamel treated with TiF4 and TiF4 + hydroxypropyl-b-cyclodextrin groups showed a TiO2 glaze-layer, while EDX evaluation identified Ti. The solution containing the inclusion complex of hydroxypropyl-b-cyclodextrin + TiF4 with 12 h of complexation period demonstrated a significant ability to reduce surface demineralization of sound enamel under an artificial cariogenic challenge.


Asunto(s)
Ciclodextrinas , Fluoruros , Animales , Bovinos , Estudios Transversales , Esmalte Dental , Titanio
9.
Medicine (Baltimore) ; 99(35): e21939, 2020 Aug 28.
Artículo en Inglés | MEDLINE | ID: mdl-32871938

RESUMEN

RATIONALE: Maturity-onset diabetes of the young type 5 (MODY 5) is a form of monogenic diabetes that is often accompanied by pancreatic dysfunction. To date, no cases of MODY 5 treated with glucagon-like peptide-1 receptor agonist (GLP-1RA) have been reported. We present the first case of MODY 5 treated with GLP-1RA. PATIENT CONCERNS: A 17-year-old woman, with a history of being operated for congenital ileal atresia at birth, was admitted to our hospital due to hyperglycemia. She had been clinically diagnosed with type 1 diabetes 1 month prior, and administered 14 units of insulin glargine 300 U/mL per day. DIAGNOSIS: She had hypopotassemia, hypomagnesaemia, pancreatic body, and tail defects, multiple renal cysts, and a family history of diabetes, and urogenital anomaly. Genetic testing revealed heterozygous deletion of hepatocyte nuclear transcription factor-1 beta, leading to the diagnosis of MODY 5. INTERVENTIONS: The patient was treated with multiple daily insulin injections for 9 days (22 units/d) before administration of GLP-1RA, and then liraglutide was initiated. OUTCOMES: Liraglutide treatment (0.6 mg/d) alone maintained the patient's glycated hemoglobin level below 7.0% for at least 12 months after discharge. A higher dose, 0.9 mg/d, of liraglutide was not tolerated by the patient due to nausea. Serum levels of C-peptide immunoreactivity were 1.15 ng/mL and 1.91 ng/mL, respectively, after 6 and 12 months of liraglutide therapy. LESSONS: GLP-1RA might be effective at regulating glucose metabolism by utilizing residual pancreatic endocrine function in patients with MODY 5. Imaging and genetic screening were helpful in the diagnosis of MODY 5.


Asunto(s)
Enfermedades del Sistema Nervioso Central/tratamiento farmacológico , Esmalte Dental/anomalías , Diabetes Mellitus Tipo 2/tratamiento farmacológico , Receptor del Péptido 1 Similar al Glucagón/agonistas , Hipoglucemiantes/uso terapéutico , Enfermedades Renales Quísticas/tratamiento farmacológico , Liraglutida/uso terapéutico , Adolescente , Enfermedades del Sistema Nervioso Central/diagnóstico por imagen , Esmalte Dental/diagnóstico por imagen , Diabetes Mellitus Tipo 2/diagnóstico por imagen , Femenino , Humanos , Hipoglucemiantes/farmacología , Enfermedades Renales Quísticas/diagnóstico por imagen , Liraglutida/farmacología , Páncreas/diagnóstico por imagen
10.
Medicine (Baltimore) ; 99(31): e21438, 2020 Jul 31.
Artículo en Inglés | MEDLINE | ID: mdl-32756155

RESUMEN

RATIONALE: Mutations in the hepatocyte nuclear factor-1-beta (HNF1B) gene result in a very variable presentation, including maturity onset diabetes of the young (MODY), renal cysts, renal dysplasia, and autosomal dominant tubulointerstitial kidney disease (ADTKD), which is characterized by tubular damage, renal fibrosis, and progressive renal dysfunction. PATIENT CONCERNS: A 22-year-old man came to the hospital presenting with hyperglycemia, hyperuricemia and elevated serum creatinine. His urine protein was within the normal range. The ultrasound examination revealed shrunken kidneys with renal cysts. The patient's mother was diagnosed with diabetes mellitus when she was 25 years old. Her laboratory results showed elevated serum creatinine. Her ultrasonography revealed shrunken kidneys with renal cysts and hydronephrosis without kidney stones. The next-generation sequencing revealed that the proband and his mother held the same heterozygous missense mutation (c.530G>A, NM_000458, p.R177Q) in the HNF1B gene. Bioinformatic analyses predicted that the mutation was likely pathogenic. DIAGNOSIS: The patient and his mother were diagnosed as ADTKD and MODY5 due to HNF1B mutation. INTERVENTION: The proband was administered metformin at a dose of 500 mg/day. OUTCOMES: The patient had well-controlled blood glucose levels and a stable renal function at his 12-month follow-up. LESSONS: We should take into account the diagnoses of ADTKD and MODY5 if patients present with early onset diabetes and multiple renal cysts or evidence of renal tubulointerstitial dysplasia, especially those with negative proteinuria results. Genetic testing helps detect the HNF1B gene mutations.


Asunto(s)
Enfermedades del Sistema Nervioso Central/genética , Esmalte Dental/anomalías , Diabetes Mellitus Tipo 2/genética , Factor Nuclear 1-beta del Hepatocito/genética , Enfermedades Renales Quísticas/genética , Nefritis Intersticial/genética , Cuidados Posteriores , Enfermedades del Sistema Nervioso Central/complicaciones , Enfermedades del Sistema Nervioso Central/tratamiento farmacológico , Diabetes Mellitus Tipo 2/complicaciones , Diabetes Mellitus Tipo 2/tratamiento farmacológico , Heterocigoto , Secuenciación de Nucleótidos de Alto Rendimiento/métodos , Humanos , Hiperglucemia/etiología , Hiperuricemia/etiología , Hipoglucemiantes/administración & dosificación , Hipoglucemiantes/uso terapéutico , Riñón/diagnóstico por imagen , Riñón/patología , Riñón/fisiopatología , Enfermedades Renales Quísticas/complicaciones , Enfermedades Renales Quísticas/tratamiento farmacológico , Enfermedades Renales Quísticas/patología , Masculino , Metformina/administración & dosificación , Metformina/uso terapéutico , Mutación Missense , Nefritis Intersticial/complicaciones , Nefritis Intersticial/patología , Linaje , Ultrasonografía/métodos , Adulto Joven
11.
J Dent Child (Chic) ; 87(2): 83-89, 2020 May 15.
Artículo en Inglés | MEDLINE | ID: mdl-32788001

RESUMEN

Purpose: Radiation-related caries is characterized by enamel delamination near the dentinoenamel junction (DEJ). We investigated the activity and expression of the matrix metalloproteinases (MMPs) -2 and -9 in order to understand disease pathogenesis in teeth submitted or not to radiotherapy (RT).
Methods: In situ zymography and immunofluorescence assays were performed to evaluate the activity and expression of MMPs -2 and -9, respectively. Twelve primary second molars were randomly assigned into two experimental subgroups: irradiated and nonirradiated. Dental fragments were exposed to radiation at a dose fraction of two Gy for five consecutive days until reaching the total dose of 60 Gy. The percentage of fluorescence in the DEJ was evaluated in three distinct regions of the tooth (cervical, cusp, and pit). The regions were photographed under fluorescence microscopy at 1.25× and 5× magnification.
Results: The intensity of fluorescence per mm 2 in the DEJ was higher in the cervical region of irradiated primary teeth (P <0.05) versus nonirradiated ones. In these areas, immunofluorescence revealed expression of MMPs -2 and -9.
Conclusion: Radiotherapy can increase the activity of MMPs -2 and -9 in the cervical region of the DEJ of primary teeth.


Asunto(s)
Dentina , Metaloproteinasas de la Matriz , Esmalte Dental , Humanos , Diente Molar , Diente Primario
12.
Int J Esthet Dent ; 15(3): 306-316, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32760925

RESUMEN

The aim of this study was to evaluate, in vivo, the immediate masking effect of white spot lesions (WSLs) treated with an infiltrant resin (IR). The investigation was conducted on 40 young adolescent and adult patients (11 to 23 years old) who presented with at least one permanent maxillary or mandibular anterior tooth with active WSLs on the enamel (ICDAS score 2). Before resin infiltration, the color of both the WSLs and the sound adjacent enamel (SAE) was evaluated by a digital spectrophotometer (CIELab). Subsequently, a resin infiltration technique (Icon) was performed on the WSLs according to the manufacturer's instruction. At the end of the clinical session, the color of the IR was evaluated. The color difference (ΔE) was calculated between WSL × SAE, WSL × IR, and IR × SAE, and then analyzed using one-way analysis of variance (ANOVA), followed by the Tukey's test. The L*, a*, and b* values of WSL, SAE, and IR were compared using the Student's t test for related samples (α = 5%). The ΔE observed was 5.93 ± 0.41 on the WSL × IR comparison, and 5.77 ± 0.41 on the IR × S AE one, indicating that the color of the WSL changed after treatment, but that the infiltration did not fully camouflage the WSLs when compared with the SAE. The lightness was higher for the SAE than for the IR. It was concluded that the IR treatment was not able to camouflage the color of the WSLs when compared with the SAE. However, the treatment was able to attenuate the discoloration of the demineralized dental enamel.


Asunto(s)
Caries Dental , Esmalte Dental , Adolescente , Adulto , Niño , Color , Humanos , Resinas Sintéticas , Espectrofotometría , Adulto Joven
13.
Int J Esthet Dent ; 15(3): 334-343, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32760927

RESUMEN

AIM: This study was conducted to assess the masking effects of some experimental resin infiltrants containing bioactive glass (BAG) and nano-fluorohydroxyapatite (n-FHAP) on enamel white spot lesions (WSLs). MATERIALS AND METHODS: Fifty enamel specimens were embedded in an acrylic resin and divided into five groups (n = 10). After creating artificial enamel lesions, the specimens were infiltrated by the following resins: 1) Group 1 (T/control group): TEG-DMA; 2) Group 2 (T2H): TEG-DMA + 2 wt% n-FHAP; 3) Group 3 (T5H): TEG-DMA + 5 wt% n-FHAP; Group 4 (T2B): TEG-DMA + 2 wt% BAG; Group 5 (T5B): TEG-DMA + 5 wt% BAG. Next, the specimens were subjected to demineralization-remineralization cycles for 2 weeks. Color assessments were performed by a spectrophotometer in four distinct stages: baseline, after the production of artificial caries, after resin infiltration, and 2 weeks after resin infiltration. L*, a*, b*, and ΔE values were calculated at each stage. Color parameters were analyzed statistically using the Kruskal-Wallis and Mann-Whitney U tests. The significance level was set at 5%. RESULTS: All treatments led to a decrease in the L3* compared with the L2* value. The resin infiltrant containing 5% fluorohydroxyapatite (FHAP) exerted the highest L* reduction effect among all the groups. The T group was the only resin infiltrant group with a lower mean of a4* than those compared at baseline. Regarding the ΔE13* and ΔE14* values, only the resin infiltrants of groups 1 (T), 2 (T2H), and 3 (T5H) were able to mask artificial caries. CONCLUSION: Experimental resin infiltrants containing n-FHAP were able to mask WSLs after 14 days.


Asunto(s)
Caries Dental , Resinas Sintéticas , Color , Esmalte Dental , Humanos , Hidroxiapatitas
14.
Stomatologiia (Mosk) ; 99(3): 11-17, 2020.
Artículo en Ruso | MEDLINE | ID: mdl-32608942

RESUMEN

The aim of the study was to study clinical and histological changes in the treatment of discoloration using different systems for professional tooth whitening. The study involved 76 patients. Patients of group 1 had their teeth whitened by the Amazing White Universal Extra photochemical activation system, and group 2 had their teeth whitened by the Beyond Polus system. Each group was divided into 3 more subgroups depending on the method of remineralization and the applied toothpaste (SENSITIVE ULTRA and SENSODYNE Rapid Relief). To assess teeth hyperesthesia before, immediately after and 14 days after the bleaching procedure, we used the prevalence index of teeth hyperesthesia, the intensity index of teeth hyperesthesia, and the Schiff sample. We also used a digital rating scale for patients. 100 teeth extracted for orthodontic indications were subjected to histological examination. The occurrence of hyperesthesia of teeth during professional bleaching was revealed in 100% of cases. Significant structural changes were registered in the enamel and dentin of the teeth, most pronounced during photo-whitening. The treatment based on zinc-substituted hydroxyapatite carbonate in combination with laserophonophoresis against the background of use the toothpaste SENSODYNE Rapid Relief had the greatest remineralizing effect.


Asunto(s)
Blanqueadores Dentales , Blanqueamiento de Dientes , Diente , Esmalte Dental , Humanos , Pastas de Dientes
15.
Stomatologiia (Mosk) ; 99(3): 27-31, 2020.
Artículo en Ruso | MEDLINE | ID: mdl-32608945

RESUMEN

THE AIM: Clinical analysis of the effectiveness of photodynamic tooth whitening according to the spectrophotometric method. MATERIAL AND METHODS: Photodynamic tooth whitening was performed in 35 patients aged 20-45 years, on the teeth of the frontal group. To record the optical characteristics of enamel, the spectrophotomerism method was used. RESULTS: The study reliably shows that the average change in color saturation «C¼ ranged from 0.5 to 2 units. The optical characteristic of luminosity "L" before and after photodynamic exposure remained within the limits of healthy enamel, and the optical characteristic of whiteness on the scale of whitened teeth was 2 units. CONCLUSION: The method of photodynamic therapy can be used in dental practice to conduct a teeth whitening procedure.


Asunto(s)
Blanqueadores Dentales , Blanqueamiento de Dientes , Diente , Adulto , Color , Esmalte Dental , Humanos , Persona de Mediana Edad , Espectrofotometría , Adulto Joven
16.
Braz Oral Res ; 34: e064, 2020 Jun 24.
Artículo en Inglés | MEDLINE | ID: mdl-32609233

RESUMEN

This study evaluated the interference of enamel and coronal dentin thickness and ambient light in pulse oximetry interpretation, using SaO2the human finger as a reference. Forty-two intact human permanent mandibular molars were sectioned mesiodistally in the central portion. Buccal and lingual dentin surfaces were drilled, and 4 mm, 3 mm and 2 mm enamel/dentin thicknesses were interposed between finger and device, after which SaO2 levels were measured by finger pulse oximetry. A reference device was designed to align pulse oximeter light-emitting diode, buccal surface of tooth, little finger, lingual surface of tooth and photodiode. Variables were described as means and standard deviation, and the confidence interval was reported. Repeated measures analysis of variance (ANOVA) was used to compare the groups, followed by Bonferroni correction. Student t test for paired samples was used to determine presence of ambient light (α = 0.05). Mean SaO2 level was lower at 4.0 ± 0.2 mm thickness, regardless of presence or absence of ambient light (92.7% and 89.3%). The other thicknesses yielded values of 95.5% and 94.5% at 3.0 ± 0.2 mm, and 96.4% and 96.0% at 2.0 ± 0.2 mm (p < 0.001). There were significant differences between SaO2 values at 4.0 ± 0.2 mm, 3.0 ± 0.2 mm and 2.0 ± 0.2 mm thicknesses, in the presence of ambient light. Mean SaO2 level in positive control was 96.3%, and mean pulse rate was 69.5 bpm in presence of ambient light; in the absence of light, these values were 96% and 70.5 bpm. Enamel and dentin thickness interfere with SaO2, regardless of presence or absence of ambient light. The lowest SaO2 levels were found for the thickest tooth samples.


Asunto(s)
Esmalte Dental , Oximetría , Dentina , Humanos , Diente Molar , Oxígeno
17.
Am J Orthod Dentofacial Orthop ; 158(3): 391-399, 2020 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-32653347

RESUMEN

INTRODUCTION: Enameloplasty of maxillary canines is often needed for aesthetic substitution in patients with congenitally missing lateral incisors. The exact enamel thicknesses for the various canine surfaces are unknown because previous studies failed to employ accurate measurement tools to report and compare detailed enamel thicknesses for each surface at various crown heights. METHODS: Thirty-two extracted maxillary canines were collected and scanned in a microcomputed tomography scanner. The scans were imported into a custom-written MATLAB software (version 9.2; MathWorks, Natick, Mass) and the enamel thickness on the mesial, distal, labial, fossa, cingulum, and incisal edge of each tooth was computed, obtaining the mean value from slices at 0.1 mm intervals. The overall mean enamel thickness for each surface was also calculated, and these values were compared using paired t tests. Incisal wear stage and incisal enamel thickness that was measured were compared using Spearman rank correlation coefficient. RESULTS: The mean enamel thickness was significantly thinner at the gingival level when compared with the incisal for all surfaces that were analyzed (1-tailed, P <0.001). The mean enamel coverage at the mesial was significantly thinner than the distal when measured gingival to the widest mesiodistal area. The mean enamel coverage of the cingulum was particularly thin and therefore requires extreme care in reshaping it. Incisal edge enamel thickness was highly negatively correlated with the wear stage of the scoring system that was used (1-tailed, P <0.001). CONCLUSIONS: The enamel coverage of the maxillary canine varies depending on the tooth surface and the incisogingival measurement location.


Asunto(s)
Diente Canino , Estética Dental , Esmalte Dental , Humanos , Maxilar , Odontometría , Microtomografía por Rayos X
18.
Am J Orthod Dentofacial Orthop ; 158(3): 330-342, 2020 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-32682661

RESUMEN

The purpose of this critical review is to list the sources of aerosol production during orthodontic standard procedure, analyze the constituent components of aerosol and their dependency on modes of grinding, the presence of water and type of bur, and suggest a method to minimize the quantity and detrimental characteristics of the particles comprising the solid matter of aerosol. Minimization of water-spray syringe utilization for rinsing is suggested on bonding related procedures, while temporal conditions as represented by seasonal epidemics should be considered for the decision of intervention scheme provided as a preprocedural mouth rinse, in an attempt to reduce the load of aerosolized pathogens. In normal conditions, chlorhexidine 0.2%, preferably under elevated temperature state should be prioritized for reducing bacterial counts. In the presence of oxidation vulnerable viruses within the community, substitute strategies might be represented by the use of povidone iodine 0.2%-1%, or hydrogen peroxide 1%. After debonding, extensive material grinding, as well as aligner related attachment clean-up, should involve the use of carbide tungsten burs under water cooling conditions for cutting efficiency enhancement, duration restriction of the procedure, as well as reduction of aerosolized nanoparticles. In this respect, selection strategies of malocclusions eligible for aligner treatment should be reconsidered and future perspectives may entail careful and more restricted utilization of attachment grips. For more limited clean-up procedures, such as grinding of minimal amounts of adhesive remnants, or individualized bracket debonding in the course of treatment, hand-instruments for remnant removal might well represent an effective strategy. Efforts to minimize the use of rotary instrumentation in orthodontic settings might also lead the way for future solutions. Measures of self-protection for the treatment team should never be neglected. Dressing gowns and facemasks with filter protection layers, appropriate ventilation and fresh air flow within the operating room comprise significant links to the overall picture of practice management. Risk management considerations should be constant, but also updated as new material applications come into play, while being grounded on the best available evidence.


Asunto(s)
Desconsolidación Dental , Ortodoncia , Aerosoles , Esmalte Dental , Humanos , Pandemias
19.
PLoS One ; 15(7): e0235414, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32667937

RESUMEN

A foreign dynasty, known as the Hyksos, ruled parts of Egypt between c. 1638-1530 BCE. Their origins are thought to be rooted in the Near East, which is supported by architectural features and grave accoutrements of Tell el-Dabca. In this former Hyksos capital in the Eastern Nile Delta, burial culture is characterized by a blend of Egyptian and Near Eastern elements. However, investigations are still ongoing as to where the Hyksos came from and how they rose to power. The aim of this study is to elucidate the question of possible provenience. We present the results of strontium isotope (87Sr/86Sr) ratios of human tooth enamel (n = 75) from Tell el-Dabca, focusing on comparing pre- and during Hyksos rule and sex-based differences. An influx of non-locals can be observed in the pre-Hyksos period (12th and 13th Dynasties, c. 1991-1649 BCE) during the constitution of this important harbor town, while the number of individuals already born in the Delta is larger during the Hyksos period. This is consistent with the supposition that, while the ruling class had Near Eastern origins, the Hyksos' rise to power was not the result of an invasion, as popularly theorized, but an internal dominance and takeover of foreign elite. There is a preponderance of non-local females suggesting patrilocal residence. We discuss our findings against the current evidence of material culture and historiography, but more investigation in Near Eastern comparative sites has to be conducted to narrow our future search for the actual origins of the Hyksos.


Asunto(s)
Restos Mortales/química , Entierro/historia , Esmalte Dental/química , Antiguo Egipto , Historia Antigua , Humanos , Isótopos de Estroncio/química
20.
PLoS One ; 15(7): e0232998, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32609719

RESUMEN

OBJECTIVES: The study tried to determine if malnutrition (underweight, stunting, wasting, overweight) and enamel defects (enamel hypoplasia, hypomineralized second molar, amelogenesis imperfecta, fluorosis) were associated with early childhood caries (ECC). The study also examined whether malnutrition was associated with the presence of enamel defects in 0-5-year-old children. METHODS: The study was a secondary analysis of primary data of a cross-sectional study assessing the association between maternal psychosocial health and ECC in sub-urban Nigerian population collected in December 2018 and January 2019. One hundred and fifty nine children were recruited. Exploratory variables were malnutrition and enamel defects. The outcome variables were the prevalence of ECC in 0-2-year-old, 3-5-year-old, and 0-5-year-old children. Multivariable Poisson regression analysis was used to determine the associations, and socioeconomic status, oral hygiene status, and frequency of in-between-meals sugar consumption were adjusted for. The adjusted prevalence ratios, 95% confidence intervals, and p values were calculated. RESULTS: The prevalence of ECC was 2.1% in 0-2-year-old children and 4.9% in 3-5-year-old children. In adjusted models, underweight, stunting, and wasting/overweight were not significant risk indicators for ECC in either age group. 0-2-year-old children who had amelogenesis imperfecta (p<0.001) and fluorosis (p<0.001) were more likely to have ECC than were children who did not have these lesions. 3-5-year-old children who had hypoplasia (p = 0.004), amelogenesis imperfecta (p<0.001) and fluorosis (p<0.001) were more likely to have ECC than were children who did not have these lesions. 0-5-year-old children with hypoplasia (p<0.001) and fluorosis (p<0.001) were more likely to have ECC than were children who did not have these lesions. There were significant associations between various types of malnutrition and various types of enamel defects. CONCLUSION: Although different types of malnutrition were associated with enamel defects, and enamel defects were associated with ECC, malnutrition was not associated with ECC. Further studies are needed to clarify the association between malnutrition and genetically and toxin-induced enamel defects.


Asunto(s)
Caries Dental/epidemiología , Esmalte Dental/patología , Desnutrición/epidemiología , Niño , Preescolar , Caries Dental/complicaciones , Femenino , Humanos , Lactante , Recién Nacido , Masculino , Desnutrición/complicaciones , Nigeria , Prevalencia , Factores de Riesgo , Población Urbana/estadística & datos numéricos
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