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1.
Acta Odontol Latinoam ; 33(2): 112-116, 2020 Sep 01.
Artículo en Inglés | MEDLINE | ID: mdl-32920613

RESUMEN

Orthodontics with low friction, low force, passive self-ligating brackets produces alveolar-dental remodeling, resulting in an increase in the transverse diameter of the dental arches, especially in the premolar sector. The aim of this study was to compare the modifications of the transverse diameter in the pre- and post-dental alignment cast models with orthodontics with passive self-ligating brackets in patients with moderate to severe dental discrepancy. The study included 28 patients of both sexes aged 16 to 48 years with dental discrepancies between -6 and -16 mm, treated with self-ligating Damon brackets and thermally activated Nickel- Titanium-Copper arches. With a digital pachymeter, Mitutoyo brand, five measurements were taken per dental arch: distance between canines (C), first premolars (1PM), second premolars (2 PM), first molars (1M) and second molars (2M), before and after orthodontic alignment. The variations were statistically evaluated by Student T Test for paired samples. Average distance between teeth varied with dental alignment in both jaws. The greatest increases in transverse diameter were recorded in the premolar areas. Minor though statistically significant variations also occurred in the 2M of the maxilla and in the C of the mandible In alignment with passive self-ligating brackets, there is an increase in the transverse diameter due to the development of the dental arches, mainly in the premolar sector of both jaws and also at the level of the canines in the mandible.


Asunto(s)
Diseño de Aparato Ortodóncico , Soportes Ortodóncicos , Cierre del Espacio Ortodóncico/instrumentación , Técnicas de Movimiento Dental/instrumentación , Adolescente , Adulto , Diente Premolar/patología , Femenino , Humanos , Masculino , Persona de Mediana Edad , Estudios Prospectivos , Adulto Joven
2.
BMC Oral Health ; 20(1): 98, 2020 04 07.
Artículo en Inglés | MEDLINE | ID: mdl-32264864

RESUMEN

BACKGROUND: We aimed to investigate the load-induced strain variation in teeth with unrestored and resin-based composite restored non-carious cervical lesions (NCCLs). METHODS: Twelve extracted premolars were provided for measuring buccal-side root NCCLs. Strain gauges were fixed at four measuring sites of each tooth, two at the buccal surface and two at the lingual surface. NCCLs were prepared with occlusal margins at the cemento-enamel junction. A static 9-kg load was applied at seven occlusal loading points: buccal cusp tip (BC), inner inclination of the BC, lingual cusp tip (LC), inner inclination of the LC, center of the mesial marginal ridge or distal marginal ridge, and center of the central groove. The strain was detected at each site in teeth with NCCL depths of 0 (control), 0.5, 1.0, and 1.5 mm. Each NCCL was restored using an adhesive composite resin, and the strains were re-measured. RESULTS: The strains at the NCCL occlusal and gingival margins decreased with increasing defect depths, and the effect was significant when the depth of the defect was 1.5 mm. Loading on the buccal and lingual cusps induced prominent strain variation. The strains at all depth distribution recovered to nearly intact conditions when the NCCLs were restored. CONCLUSIONS: NCCLs at 1.5 mm depth are detrimental, but they can be restored using resin composites. CLINICAL SIGNIFICANCE: The existence of NCCLs should not be ignored. The depth of the NCCL may affect the progression of the lesion. Resin composite restoration is an appropriate method for preventing persistent NCCL deterioration.


Asunto(s)
Diente Premolar/patología , Resinas Compuestas , Esmalte Dental/fisiología , Restauración Dental Permanente , Abrasión de los Dientes/terapia , Cuello del Diente/patología , Erosión de los Dientes/terapia , Diente Premolar/fisiología , Fuerza Compresiva , Preparación de la Cavidad Dental , Materiales Dentales , Análisis del Estrés Dental , Humanos , Abrasión de los Dientes/fisiopatología , Erosión de los Dientes/fisiopatología
4.
Biomed Res Int ; 2019: 1271523, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-31317022

RESUMEN

Fixed orthodontic treatments often lead to enamel demineralization and cause white spot lesions (WSLs). The aim of this study was to evaluate the mineralization degree of 2 types of WSLs based on ICDAS index and compare the remineralizing efficacy of 3 oral hygiene practices after 1 month and 3 months. 80 mild demineralized and 80 severe demineralized enamel specimens were randomized into three treatments: fluoride toothpaste (FT), fluoride varnish plus fluoride toothpaste (FV+FT), and CPP-ACP plus fluoride toothpaste (CPP-ACP+FT). Microhardness tester, DIAGNODent Pen 2190, and scanning electron microscope were used to evaluate the changes of mineralization degree. Both qualitative and quantitative indicators suggested that the mild and severe white spot lesions were different in the degree of mineralization. Severe WSLs demineralized much more seriously than mild lesions even after 3 months of treatment. Despite the variation in severity, both lesions had the same variation trend after each measure was applied: FT had weak therapeutic effect, FV + FT and CPP-ACP + FT were effective for remineralization. Their remineralizing efficacy was similar after 1 month, and combined use of CPP-ACP plus F toothpaste was more effective after 3 months. In order to fight WSLs, early diagnosis was of great importance, and examination of the tooth surface after air-dry for 5 seconds was recommended. Also, when WSLs were found, added remineralizing treatments were required.


Asunto(s)
Diente Premolar/efectos de los fármacos , Caries Dental/prevención & control , Fluoruros/uso terapéutico , Diente Premolar/patología , Fosfatos de Calcio/uso terapéutico , Caries Dental/patología , Fluoruros Tópicos/uso terapéutico , Microscopía Electrónica de Rastreo , Higiene Bucal/métodos , Remineralización Dental , Pastas de Dientes/uso terapéutico
5.
Leg Med (Tokyo) ; 37: 18-24, 2019 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-30597413

RESUMEN

Age is often estimated using teeth because numerous external and internal changes appear due to aging. The purpose of this study was to investigate an age estimation method based on the volume ratio of the internal structure of the crown. 61 maxillary first premolars and 50 maxillary second premolars from subjects aged 20-79 years old were used. Micro CT, which can be used to analyze teeth in a non-destructive manner with high sensitivity, was employed in the present study. In consideration of individual differences among subjects, the volume ratio was calculated for the following four items: The pulp chamber was calculated separately based on the presence of enamel.In order to estimate age, regression analysis was conducted with the actual age as the dependent variable and each volume ratio as the independent variable. As a result, the highest correlation was found with PVR (E-) for each measurement item. Therefore, the regression equation using the volume change of the maxillary premolar crown as an index was as follows: Age = -12.43 × 4: PVR (E-) + 69.85. Age = -12.94 × 5: PVR (E-) + 72.54.


Asunto(s)
Determinación de la Edad por los Dientes/métodos , Envejecimiento/patología , Diente Premolar/diagnóstico por imagen , Odontología Forense/métodos , Maxilar , Corona del Diente/diagnóstico por imagen , Microtomografía por Rayos X , Adulto , Anciano , Diente Premolar/patología , Esmalte Dental/diagnóstico por imagen , Esmalte Dental/patología , Cavidad Pulpar/diagnóstico por imagen , Cavidad Pulpar/patología , Femenino , Humanos , Masculino , Persona de Mediana Edad , Corona del Diente/patología , Adulto Joven
6.
J Int Med Res ; 47(1): 470-480, 2019 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-30514145

RESUMEN

OBJECTIVE: The purpose of this study was to evaluate the effect of immediate and delayed post space preparation on the sealing ability of two root canal obturation techniques by using micro-computed tomography imaging and a push-out test. METHODS: The root canals of 40 human maxillary premolar teeth were instrumented and divided into four groups: (A) single cone (SC) followed by immediate post space preparation, (B) continuous wave of condensation (CWC) followed by immediate post space preparation, (C) SC followed by delayed post space preparation, and (D) CWC followed by delayed post space preparation. Micro-CT scans were performed for volumetric analysis of voids and filling materials in the apical 4-mm portion. A push-out test was performed, and failure modes (adhesive, cohesive, or mixed) were assessed. Data were analyzed using the Kruskal-Wallis test and one-way analysis of variance. RESULTS: No significant differences were observed among the four groups in terms of the percentage volume of voids of the apical 4 mm or the bond strength of apical gutta-percha. CONCLUSIONS: The percentage volume of voids and bond strength of apical gutta-percha were similar and were not significantly influenced by the timing of post space preparation or the obturation technique.


Asunto(s)
Diente Premolar/cirugía , Cavidad Pulpar/cirugía , Gutapercha/química , Obturación del Conducto Radicular/métodos , Análisis de Varianza , Diente Premolar/patología , Cavidad Pulpar/diagnóstico por imagen , Cavidad Pulpar/patología , Análisis de Falla de Equipo/métodos , Humanos , Maxilar/diagnóstico por imagen , Maxilar/cirugía , Obturación del Conducto Radicular/instrumentación , Factores de Tiempo , Extracción Dental , Microtomografía por Rayos X
7.
Photodiagnosis Photodyn Ther ; 25: 142-147, 2019 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-30508664

RESUMEN

BACKGROUND: This study compared two fluorescence parameters (fluorescence loss [ΔF] and red fluorescence gain [ΔR]) among three generations of quantitative light-induced fluorescence (QLF) systems with the aim of determining the validities of these parameters in the three devices for differentiating the severity of enamel caries. METHODS: Forty-one extracted human premolars and molars with suspected enamel caries were selected. Fluorescence images of all teeth were obtained using first-, second-, and third-generation QLF systems (Inspektor Pro, QLF-D, and Qraycam, respectively). Fluorescence parameters were then calculated using proprietary software. All of the specimens were also categorized histologically using polarized-light microscopy (PLM) based on histological levels related to the lesion depth into sound enamel (S), caries limited to the outer half of the enamel (E1), and caries involving the inner half of the enamel (E2). The Mann-Whitney test with Bonferroni correction was used to compare fluorescence parameters among the three generations of systems. The sensitivity, specificity, and area under the receiver operating characteristics curve (AUC) at two thresholds (S/E1 for detecting enamel caries lesions and E1/E2 for differentiating the caries severity) were calculated for evaluating the validities of the fluorescence parameters obtained using all three generations of QLF devices. RESULTS: ΔF did not differ significantly between the devices at any histological level. In addition, ΔF showed large AUCs at the thresholds of S/E1 and E1/E2 (0.97-0.98 and 0.89-0.90, respectively). On the other hand, ΔR was significantly higher for the third-generation device than for the first- and second-generation devices for E2 lesions (P < 0.001). At the S/E1 threshold, ΔR values of the first- and third-generation devices showed larger AUCs (0.96-0.97) compared with that of the second-generation device (0.91), whereas at the E1/E2 threshold the AUC was the largest for the third-generation device (0.87). CONCLUSIONS: The ΔF fluorescence parameter did not differ between the three generations of QLF devices, and showed high validity values. In terms of ΔR, the devices of all generations also showed good diagnostic performance for quantifying and detecting enamel caries lesions, but the third-generation QLF system produced superior results.


Asunto(s)
Caries Dental/diagnóstico , Caries Dental/patología , Esmalte Dental/patología , Fluorescencia Cuantitativa Inducida por la Luz/instrumentación , Diente Premolar/patología , Humanos , Diente Molar/patología , Fluorescencia Cuantitativa Inducida por la Luz/normas
8.
Int J Paleopathol ; 24: 89-93, 2019 03.
Artículo en Inglés | MEDLINE | ID: mdl-30321770

RESUMEN

OBJECTIVE: The aim of this paper was to analyse the dental remains of an adult male with three impacted canines from the Roman period cemetery in Osijek, Croatia. MATERIALS: The dental remains of an adult male aged 35-45 years at the time of death were analysed. METHODS: Macroscopic analysis of dental remains was accompanied by radiographic examination. RESULTS: The individual also had additional dental pathologies (carious lesion, antemortem tooth loss). A total of 21 permanent teeth were present in maxillae and mandible. Eighteen of them were normal fully erupted dentition, while three were impacted: left maxillary canine and both mandibular canines. The left maxillary and mandibular canines were mesially inclined, and the right mandibular canine was relatively horizontally positioned. CONCLUSION: A case of non-syndrome impaction in which the lack of eruptive force in combination with the unfavorable position of the tooth bud might have resulted in multiple impacted teeth is presented. SIGNIFICANCE: Current clinical knowledge reports low frequency of this anomaly, with maxillary impaction occurring more often than mandibular. Furthermore, canine impaction is even more rarely reported in the archaeological material. The presented case is the only one from the archaeological setting with impaction present both in maxillae and mandible. LIMITATIONS: In modern populations multiple impactions are often associated with various syndromes. Since the majority of syndromes affect soft tissue, their association with impaction cannot be confirmed in archaeological populations.


Asunto(s)
Arco Dental/patología , Mandíbula/patología , Maxilar/patología , Anomalías Dentarias/patología , Diente Impactado/patología , Diente Premolar/patología , Croacia , Historia Antigua , Humanos , Radiografía Panorámica/métodos , Anomalías Dentarias/historia , Erupción Dental , Diente Impactado/historia
9.
J Investig Clin Dent ; 10(1): e12378, 2019 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-30474243

RESUMEN

AIM: The aim of the present study was to evaluate the efficacy on the healing of mechanical decontamination of infected implant surfaces performed with a titanium brush. METHODS: Mandibular premolars and first molars were extracted bilaterally in six dogs. After 3 months, two unsubmerged implants were installed on both sides of the mandible. Three months later, peri-implantitis was induced with ligatures for 3 months and then removed. After 1 month, surgical mechanical decontamination of the surfaces was performed either with a rotatory titanium brush or gauzes soaked in saline. Five month later, biopsies were retrieved. Evaluations on X-rays taken of the mesiodistal plane and on histological slides prepared in a buccal-lingual plane were performed. RESULTS: After the induction of peri-implantitis, a mean marginal bone loss of 2.6 ± 0.6 mm and 1.9 ± 1.0 mm was observed in the brush and gauze groups by X-ray, respectively. Five months after treatment, a mean gain of marginal bone of 0.6 mm was obtained in both groups. The mean closures of the vertical and horizontal defects were 0.6 mm and 0.6 mm for the brush group, and 0.8 mm and 0.5 mm for the gauze group, respectively. Histologically, a loss of attachment at the buccal aspect of 2.2 ± 0.9 mm in the brush group and of 2.3 ± 0.5 mm in the gauze group was found. No statistically-significant differences were found after the treatment. CONCLUSIONS: Mechanical implant surface decontamination performed with a rotatory titanium brush resulted in a marginal bone level gain, yielding a low content of inflammatory infiltrate close to the marginal bone.


Asunto(s)
Descontaminación/métodos , Periimplantitis/diagnóstico por imagen , Periimplantitis/patología , Periimplantitis/terapia , Pérdida de Hueso Alveolar/diagnóstico por imagen , Pérdida de Hueso Alveolar/patología , Pérdida de Hueso Alveolar/terapia , Animales , Diente Premolar/patología , Descontaminación/instrumentación , Implantación Dental Endoósea/efectos adversos , Implantes Dentales/efectos adversos , Placa Dental , Diseño de Prótesis Dental , Modelos Animales de Enfermedad , Perros , Implantes Experimentales/efectos adversos , Mandíbula/patología , Mandíbula/cirugía , Periimplantitis/cirugía , Radiografía Dental/métodos , Propiedades de Superficie , Titanio
10.
Int J Numer Method Biomed Eng ; 35(3): e3169, 2019 03.
Artículo en Inglés | MEDLINE | ID: mdl-30427587

RESUMEN

OBJECTIVE: Finite element (FE) method's correctness depends heavily on modeling method. This study aimed at determining whether the interfaces at bracket-wire and between teeth can be simplified for multi-teeth FE analysis. METHOD: A three-dimensional FE model of a mandible was created from cone-beam computed tomography scan. Due to symmetry, only a half of the mandible was modeled, which consisted of five teeth (first premolar extraction and only first molar), brackets and archwire, periodontal ligament (PDL), cortical bone, and cancellous bone. All the bone, teeth, and PDL were considered to be isotropic and linear. The En-masse retraction case was simulated. A detailed model, which has contact elements between the bracket and archwire and between teeth, was developed to allow relative motion at the interfaces. A model with simplified interfacial conditions, which does not allow the relative motion, was also created. The stresses and displacements as results of the treatment on these two models were calculated and compared. RESULTS: The stress and displacement distributions from the detailed model were more close to reality based on the expected displacement pattern of the clinical case than from the simplified model. The maximum stresses from the two methods were also different. The highest stress from the detailed model is twice as high as from the simplified model. CONCLUSIONS: The detailed model provides much more reasonable results than the simplified model. Thus, the simplified model should not be used to replace the detailed model if the stress magnitude and highest stress location are the expected outcomes.


Asunto(s)
Diente Premolar , Mandíbula , Modelos Biológicos , Soportes Ortodóncicos , Ligamento Periodontal , Diente Premolar/patología , Diente Premolar/fisiopatología , Femenino , Análisis de Elementos Finitos , Humanos , Masculino , Mandíbula/patología , Mandíbula/fisiopatología , Ligamento Periodontal/fisiología , Ligamento Periodontal/fisiopatología , Estrés Mecánico
11.
Eur J Orthod ; 40(6): 575-582, 2018 11 30.
Artículo en Inglés | MEDLINE | ID: mdl-30500916

RESUMEN

Objectives: To compare parameters related to impacted canines at the cleft versus the normal contralateral side and with non-impacted canines at the cleft side in unilateral cleft lip and palate (UCLP) patients. We also aim to search for possible associated parameters enabling prediction of canine impaction in these patients. Materials and methods: Ninety-five non-syndromic UCLP patients were included and divided into group A (n = 41 patients) with unilateral impacted canines at the cleft side (A1) and spontaneously erupted canines at the non-cleft side (A2) and group B with spontaneously erupted canines at the cleft side (n = 54 patients). Clinical information and radiographic parameters on panoramic radiographs were collected and compared between groups using a generalized linear mixed model, a Mann-Whitney U-test, a Fisher's exact test, and receiver operating characteristic tests. Results: Impaction of the maxillary canine at the cleft side in UCLP patients can be suspected in case of delayed canine root development, a higher vertical position and sector score (P < 0.05) and higher angles between the canine and the midline, as well as between canine and lateral incisor and between first premolar (P < 0.001). Results clearly indicate that the erupting canine position at the cleft side, even when not impacted, is different from the non-cleft side. Conclusion: There is a great risk for canine impaction at the cleft side in UCLP patients when the canine position is more apical than one-third of the root of the adjacent lateral incisor and when the angles between canine and midline and between canine and first premolar are higher than 23.82 and 16.1 degrees, respectively. These associated parameters should have to be studied in a prospective setting to confirm their predictive value.


Asunto(s)
Injerto de Hueso Alveolar/métodos , Labio Leporino/complicaciones , Fisura del Paladar/complicaciones , Diente Impactado/etiología , Diente Premolar/diagnóstico por imagen , Diente Premolar/patología , Labio Leporino/patología , Labio Leporino/cirugía , Fisura del Paladar/patología , Fisura del Paladar/cirugía , Diente Canino/diagnóstico por imagen , Diente Canino/crecimiento & desarrollo , Diente Canino/patología , Femenino , Humanos , Incisivo/diagnóstico por imagen , Incisivo/patología , Lactante , Masculino , Radiografía Panorámica , Estudios Retrospectivos , Erupción Dental , Diente Impactado/diagnóstico por imagen , Diente Impactado/patología
12.
Am J Orthod Dentofacial Orthop ; 154(3): 326-336, 2018 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-30173835

RESUMEN

INTRODUCTION: The purpose of this 2-arm-parallel split-mouth trial was to investigate the effect of low-level laser therapy (LLLT) on the repair of orthodontically induced inflammatory root resorption (OIIRR). METHODS: Twenty patients were included in this study, with 1 side randomly assigned to receive LLLT, and the other side served as a sham. Eligibility criteria included need for bilateral maxillary first premolar extractions as part of fixed appliance treatment. OIIRR was generated by applying 150 g of buccal tipping force on the maxillary first premolars for 4 weeks. After the active force was removed, the teeth were retained for 6 weeks. LLLT commenced with weekly laser applications using a continuous beam 660-nm, 75-mW aluminum-gallium-indium-phosphorus laser with 1/e2 spot size of 0.260 cm2, power density of 0.245 W/cm2, and fluence of 3.6 J/cm2. Contact application was used at 8 points buccally and palatally above the mucosa over each tooth root for 15 seconds with a total treatment time of 2 minutes. After 6 weeks, the maxillary first premolars were extracted and scanned with microcomputed tomography for primary outcome OIIRR calculations. Subgroup analysis included assessment per root surface, per vertical third, and sites of heaviest compressive forces (buccal-cervical and palato-apical). Randomization was generated using www.randomization.com, and allocation was concealed in sequentially numbered, opaque, sealed envelopes. Blinding was used for treatment and outcome assessments. Two-tailed paired t tests were used to determine whether there were any statistically significant differences in total crater volumes of the laser vs the sham treated teeth. RESULTS: Total crater volumes were 0.746 mm3 for the laser treated teeth and 0.779 mm3 for the sham. There was a mean difference of 0.033 ± 0.39 mm3 (95% CI, -0.21 to 0.148 mm3) greater resorption crater volume in the sham group compared with the laser group; this was not statistically significant (P = 0.705). No harm was observed. CONCLUSIONS: No significant difference was found between LLLT and sham control groups in OIIRR repair.


Asunto(s)
Cemento Dental/patología , Cemento Dental/efectos de la radiación , Terapia por Luz de Baja Intensidad , Resorción Radicular/radioterapia , Técnicas de Movimiento Dental/métodos , Raíz del Diente/patología , Raíz del Diente/efectos de la radiación , Adolescente , Diente Premolar/patología , Diente Premolar/efectos de la radiación , Método Doble Ciego , Femenino , Humanos , Masculino , Diseño de Aparato Ortodóncico , Soportes Ortodóncicos , Alambres para Ortodoncia , Estrés Mecánico , Extracción Dental , Técnicas de Movimiento Dental/instrumentación , Resultado del Tratamiento , Microtomografía por Rayos X
13.
PLoS One ; 13(8): e0202295, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-30133509

RESUMEN

OBJECTIVE: The aim of this in vitro study, is to evaluate the penetration of a bioceramic root canal sealer into dentinal tubules at 3 mm and 5 mm from the apex after Nd:YAG laser irradiation. METHODS: Forty freshly extracted human mandibular premolars were prepared using Reciproc® and irrigated with 17% ethylenediaminetetraacetic acid (EDTA). Teeth were divided into 4 groups: group 1, obturated with control sealer (AH Plus®); group 2, obturated with bioceramic sealer (Endosequence BC Sealer®); group 3, Nd:YAG laser + control sealer (AH Plus®); and group 4, Nd:YAG laser + bioceramic sealer (Endosequence BC Sealer®). The samples were transversely sectioned 3 mm and 5 mm from the apex and examined using confocal laser scanning microscopy. Two parameters were measured: 1) sealer penetration into dentinal tubules of the root canal and 2) sealer penetration into the perimeter of the root canal walls. RESULTS: Penetration analysis showed that bioceramic sealer had a higher penetration at depths of 3 and 5 mm than that of the control sealer, regardless of laser use (p <0.05). Perimeter analysis showed that there was no difference between both sealers at a depth of 3 mm (p <0.05), regardless of laser use. At a depth of 5 mm, bioceramic sealer and laser showed a greater perimeter of penetration (p <0.05) than the control sealer. CONCLUSION: The use of Nd:YAG laser did not compromise the penetration of bioceramic sealer into dentinal tubules of root canals at 3 mm and 5 mm from the apex.


Asunto(s)
Cavidad Pulpar/efectos de la radiación , Láseres de Estado Sólido , Materiales de Obturación del Conducto Radicular/efectos de la radiación , Cemento de Óxido de Zinc-Eugenol/efectos de la radiación , Diente Premolar/patología , Diente Premolar/efectos de la radiación , Cavidad Pulpar/patología , Humanos , Técnicas In Vitro , Ensayo de Materiales , Microscopía Confocal , Tratamiento del Conducto Radicular
14.
J Investig Clin Dent ; 9(4): e12352, 2018 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-29984903

RESUMEN

AIM: The aim of the present study was to investigate the tissue generated after regenerative endodontic procedure (REP) in the root canal space of an immature mandibular second premolar with pulp necrosis and chronic apical abscess using cone-beam computed tomographic (CBCT) and histological methods. METHODS: REP was performed in an immature mandibular second premolar. At the 3-year follow up, CBCT scans were taken to evaluate the outcome of treatment. As the tooth was not restorable to function, it was extracted and processed for histological examination. RESULTS: CBCT showed a reduction in size of the periradicular radiolucency, with a marginal increase in root length. Apical closure and thickening of the root canal walls were apparent. Histologically, the root canal space was filled with minimally-inflamed fibrous connective tissue. Some cementum-like mineralized connective tissue was evident on the internal canal walls. The apical third showed cementum-like deposits at the apex and the outer canal walls, without dentin formation. CONCLUSIONS: The present study of a structurally-failed tooth with prior REP demonstrates that the tissue formed within the root canal space was fibrous connective tissue with cementum-like deposition in the canal space. No evidence of dentin- or pulp-like tissue was found.


Asunto(s)
Diente Premolar/diagnóstico por imagen , Absceso Periapical/diagnóstico por imagen , Endodoncia Regenerativa/métodos , Adolescente , Diente Premolar/patología , Tomografía Computarizada de Haz Cónico , Humanos , Masculino , Mandíbula , Absceso Periapical/patología , Absceso Periapical/terapia , Radiografía Panorámica
15.
Georgian Med News ; (278): 55-62, 2018 May.
Artículo en Inglés | MEDLINE | ID: mdl-29905546

RESUMEN

Transposition of teeth - mutual exchange of the teeth position in the dental arch, it's a rare anomaly of the dentoalveolar apparatus. Most often in the transposition process the upper canines are involved in combination with the first premolars. Anomaly is mainly caused by an incorrect location of the teeth germs. Full correction is optimal in the treatment of transposition in terms of function and aesthetics, but in most cases, the movement of these teeth in their physiological position is impossible. Aim - to define and argue the tactics of the orthodontist in the treatment of patients with teeth transposition. The algorithm for curation of patients with teeth transposition consisted of several blocks: the establishment of etiologic factors, clinical and additional examination methods, planning and making treatment tactics, the stages of active treatment and management of the patient in the retention period. Among additional methods of examination were used: orthopantomography, 3D computer tomography, photometry, anthropometry. For a visual demonstration of orthodontic treatment, an curation algorithm of two patients with a teeth transposition was described. The choice of treatment options depended on the location and type of transposition (full or partial), the age of the patient, the condition of the periodontal tissue, the size of the teeth and their roots, the degree of tooth dislocation and root inclination, the type of occlusion, the bone thickness in the region of alveolar process, the level of cooperation between the patient and the doctor. Knowledge of the treatment tactics of patients with teeth transposition allows the orthodontist to normalize the individual teeth position, restore function and aesthetics in an optimal time. After our patient's treatment, positive esthetic, morphological and functional results were achieved.


Asunto(s)
Algoritmos , Diente Premolar/cirugía , Diente Canino/cirugía , Maloclusión/cirugía , Mandíbula/cirugía , Maxilar/cirugía , Adolescente , Antropometría , Diente Premolar/diagnóstico por imagen , Diente Premolar/patología , Niño , Diente Canino/diagnóstico por imagen , Diente Canino/patología , Oclusión Dental , Humanos , Masculino , Maloclusión/diagnóstico por imagen , Maloclusión/patología , Mandíbula/diagnóstico por imagen , Mandíbula/patología , Maxilar/diagnóstico por imagen , Maxilar/patología , Tomografía Computarizada Multidetector , Soportes Ortodóncicos , Radiografía Panorámica
16.
J Dent ; 74: 49-55, 2018 07.
Artículo en Inglés | MEDLINE | ID: mdl-29800637

RESUMEN

OBJECTIVES: This randomized controlled clinical trial evaluated the efficacy of sealing carious dentin in controlling the progression of lesions in primary molars for 2-year follow-up. MATERIALS AND METHODS: Children (6.79 ±â€¯1.81 years, n = 28) presenting primary molars with occlusal caries in the outer half of dentine were randomized and allocated into 2 groups: test (sealing caries with a flowable resin - SC) and control (partial removal of caries followed by restoration - PRC). The primary outcomes were: the clinical success of restorations evaluated by USPHS criteria and the radiographic analysis of caries progression. The children anxiety was evaluated by a Facial Image Scale; and the time required to perform the treatments was registered. RESULTS: In 21 patients evaluated after 2 years, 48 primary molars were analyzed. Clinically, there was no difference between the groups. There was no difference between treatments (p = 0.848) considering lesion progression. The anxiety level did not change after the two interventions (p = 0.650). The treatment time of SC (9.03 ±â€¯1.91 min) was lower (p = 0.002) than the PRC time (17.13 ±â€¯5.26 min). CONCLUSION: Sealing carious dentin may be used in dentistry since it did not alter the children anxiety, reduced the chair time and demonstrated clinical success rate and no radiographic difference in relation to the partial caries removal followed by restoration.


Asunto(s)
Resinas Compuestas/uso terapéutico , Caries Dental/terapia , Selladores de Fosas y Fisuras/uso terapéutico , Diente Primario , Diente Premolar/patología , Niño , Preescolar , Caries Dental/patología , Esmalte Dental/patología , Materiales Dentales , Restauración Dental Permanente/métodos , Dentina/patología , Progresión de la Enfermedad , Femenino , Humanos , Masculino , Diente Molar/patología , Factores de Tiempo , Resultado del Tratamiento
17.
J Dent ; 74: 56-60, 2018 07.
Artículo en Inglés | MEDLINE | ID: mdl-29775637

RESUMEN

OBJECTIVE: Infiltrant resin (IR) is currently indicated for non-cavitated caries lesions. However, modifying the technique might expand its indication spectrum to micro-cavitated lesions. The present study aimed to evaluate the penetration/filling ability of a newly developed micro-filled infiltrant resin (MFIR) in non-, micro- and cavitated natural caries lesions. MATERIALS AND METHODS: Proximal lesions in 120 extracted human teeth with ICDAS-2 (n = 30), 3 (n = 45) and 5 (n = 45) lesions were etched with 15% hydrochloric acid gel for 2 min and allocated to one of the following treatments; IR: lesions (ICDAS-2, 3 and 5; each n = 15) were treated with commercial infiltrant resin for 3 min. MFIR: experimental MFIR [55 wt% IR plus 45 wt% organic fillers] was applied to lesions (ICDAS-2, 3 and 5; each n = 15) for 3 min. IR + FC: IR was applied for 3 min, light-cured, and cavities (ICDAS-3 and 5; each n = 15) filled with flowable composite (FC). Percentage infiltration of the demineralized enamel (Inf.%) and percentage filling of the cavity (Fill.%) were analyzed using dual-fluorescence staining and confocal microscopy. RESULTS: No significant differences in Inf.% (range of medians: 57%-100%) were observed between different treatments (p > 0.05; Kruskal-Wallis) within each ICDAS-code. Fill.% of cavities was significantly higher in groups MFIR (median in ICDAS-3/-5: 100%/100%) and IR + FC (100%/100%) than IR (25%/38%) (p < 0.05). CONCLUSION: MFIR showed similar penetration into natural lesions as the commercial infiltrant, but better ability to fill cavitated areas. CLINICAL RELEVANCE: MFIR and IR + FC might provide a new micro-invasive treatment for small cavitated proximal lesions.


Asunto(s)
Resinas Compuestas/uso terapéutico , Caries Dental/terapia , Materiales Dentales/uso terapéutico , Restauración Dental Permanente/métodos , Resinas Sintéticas/uso terapéutico , Grabado Ácido Dental/métodos , Diente Premolar/patología , Resinas Compuestas/química , Caries Dental/diagnóstico por imagen , Caries Dental/patología , Esmalte Dental/diagnóstico por imagen , Esmalte Dental/patología , Materiales Dentales/química , Humanos , Ácido Clorhídrico/química , Técnicas In Vitro , Ensayo de Materiales , Diente Molar/patología , Resinas Sintéticas/química , Propiedades de Superficie , Factores de Tiempo
18.
Med Biol Eng Comput ; 56(10): 1875-1886, 2018 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-29633113

RESUMEN

In order to investigate the influence of cusp reduction, cavity isthmus width, and restorative material on stress values in premolar with mesio-occlusal-distal (MOD) cavity, numerical simulations were done on three-dimensional (3D) models of a maxillary second premolar designed using computerized tomography (CT) scan images. The use of four restorative materials (direct resin composite, direct resin composite with resin-modified glass-ionomer cement as the base, indirect resin composite, ceramic), three cavity preparation designs (without cusp coverage, 2-mm palatal cusp coverage, 2-mm palatal and buccal cusp coverage), and two cavity isthmus widths (1/2 and 2/3 intercuspal width) were simulated. After applying a static load of 200 N on the occlusal surface of the tooth, von Mises stresses in the enamel, dentin, and restoration were calculated using finite element analysis (FEA). Stress values in the enamel were primarily influenced by cavity preparation design, while restorative material showed higher contribution in dentin. The lowest stress values were obtained in models with cusp coverage and indirect restorations. Cavity isthmus width had minimal influence on stress values in tooth structures. None of the investigated factors determined stress values in the restoration. In conclusion, the use of ceramic restoration covering both palatal and buccal cusp provided the most favourable stress distribution of premolars with MOD cavity. Graphical abstract ᅟ.


Asunto(s)
Diente Premolar/patología , Preparación de la Cavidad Dental , Materiales Dentales/farmacología , Análisis del Estrés Dental , Análisis de Elementos Finitos , Análisis de Varianza , Esmalte Dental/patología , Dentina/química , Humanos , Imagenología Tridimensional
19.
Acta Odontol Scand ; 76(5): 346-350, 2018 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-29648497

RESUMEN

AIM: Early clinical and radiological diagnosis of dental caries is one of the fundamental objectives of clinical dentistry because of the high frequency of the disease and severe complications if caries remains untreated, especially among the elderly and patients with immunodeficiency. Dental panoramic tomography (DPT) is a common radiographic method for evaluating dentition when indicated, especially in an adult population. The aim of this study was to assess the reproducibility of diagnosis between specialists in oral radiology and general dentists with regards to caries lesions based on DPTs of adults. MATERIAL AND METHODS: One-hundred DPTs taken from adult patients (average age 35) and then analyzed and reported on by 42 general dentists were then analyzed independently by two specialists in oral radiology with respect to caries lesions in the premolar and molar areas using radiographic criteria established for caries diagnosis. The general dentists versus oral radiologists were not calibrated before. Level of agreement between specialists and general dentists was measured using Cohen's kappa. RESULTS: Comparison between observations of general dentists and specialists in oral radiology showed that 61% of the caries lesions on proximal surfaces of premolars and molars observed by specialists went unobserved by general dentists. Cohen's kappa value for specialists was 0.85 (p < .001) and for each specialist and general dentists 0.48 (p < .001) and 0.44 (p < .001). CONCLUSIONS: The reproducibility between specialists in oral radiology and general dentists for detecting caries in DPTs was low.


Asunto(s)
Caries Dental/diagnóstico por imagen , Odontólogos/estadística & datos numéricos , Interpretación de Imagen Radiográfica Asistida por Computador/normas , Radiografía Panorámica/normas , Radiólogos/normas , Adulto , Diente Premolar/patología , Competencia Clínica , Femenino , Humanos , Masculino , Persona de Mediana Edad , Diente Molar/diagnóstico por imagen , Radiografía , Reproducibilidad de los Resultados
20.
Kaohsiung J Med Sci ; 34(4): 249-254, 2018 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-29655415

RESUMEN

This retrospective study aimed to evaluate the clinicopathological features of 232 cases of radicular cyst (January 2001-December 2016) submitted for histopathological examination to Department of Oral Pathology by endodontists in our institution. Demographic data including age, gender, affected site, involved tooth, and histopathological features, were reviewed. The study population comprised 133 females (57.3%) and 99 males (42.7%), with a mean age of 40.5 years and an age range of 13-78 years. Two-hundred and one cysts occurred in the maxilla (86.7%) and 31 in the mandible (13.3%). Most cases involved the anterior teeth of the maxilla (67.2%). The most frequently-involved tooth was the maxillary lateral incisor (50.5%). In most cases (228 cases; 98.3%), the cyst was lined with nonkeratinized stratified squamous epithelium, with two cases containing epithelial lining of the mucoepidermoid epithelium (0.9%) and respiratory epithelium (0.9%), respectively. One case (0.4%) revealed epithelial dysplasia of the epithelial lining. Hyaline body was seen in two cases (0.9%), and Rushton body was noted in seven cases (3.0%). Odontogenic epithelial rest was noted in one case (0.4%). Cholesterol clefts (54 cases; 23.3%), foamy histiocytes (72 cases; 31.0%), hemosiderins (57 cases; 24.6%), dystrophic calcifications (94 cases; 40.5%), foreign bodies (44 cases; 19.0%), and bacterial colonies (22 cases; 9.5%) were also observed. Fifty-three cases (22.8%) showed a mixed acute and chronic inflammatory infiltrate, whereas chronic inflammatory infiltrate only was noted in 179 cases (77.2%). In summary, the current findings provide a valuable source for clinicopathological reference concerning radicular cysts of the jawbone.


Asunto(s)
Diente Premolar/patología , Incisivo/patología , Mandíbula/patología , Maxilar/patología , Quiste Radicular/patología , Adolescente , Adulto , Anciano , Diente Premolar/cirugía , Células Epiteliales/patología , Femenino , Histocitoquímica , Humanos , Hialina/citología , Incisivo/cirugía , Masculino , Mandíbula/cirugía , Maxilar/cirugía , Persona de Mediana Edad , Quiste Radicular/cirugía , Estudios Retrospectivos , Factores Sexuales
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