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1.
Niger J Clin Pract ; 23(5): 596-602, 2020 May.
Artículo en Inglés | MEDLINE | ID: mdl-32367864

RESUMEN

Aim: The aim of this retrospective study is to evaluate and compare the 3-dimensional (3D) crown sizes of the left and right sides of upper and lower dental arches in patients with unilateral cleft lip and palate (UCLP). Materials and Methods: Dental casts of 94 patients all in permanent dentition were included in this study. Dental casts were divided into three groups as 36 casts with unilateral left cleft lip and palate (ULCLP), 18 casts with unilateral right cleft lip and palate (URCLP), and 40 casts without cleft (control). Mesiodistal (MD), buccolingual (BL), and gingiva incisal (GI) values of each tooth were measured by scanning the dental models with a high-precision optical 3D scanner. Paired t-test and independent t-test were used for statistical analysis. Results: U1 MD, U6 MD (P = 0.001) and BL (P = 0.01), L3 GI (P = 0.05) were greater in UCLP patients on the non-cleft side while U1 GI, L1 BL, L5 MD (P = 0.001), L4 MD, and BL (P = 0.01) values were found to be greater on the cleft side. Comparison of the cleft-sides and the control group showed that MD, BL, and GI dimensions of teeth on the cleft sides were generally found to be smaller, excluding the UR7 GI values for URCLP group (P = 0.05). Conclusion: In the measurements of teeth size, reliable and repeatable results were acquired through 3D software. Tooth size asymmetries can occur non-syndromic UCLP patients in both jaws. MD, BL, and GI dimensions of teeth are mostly found to be smaller in patients with CLP.


Asunto(s)
Labio Leporino , Imagenología Tridimensional/métodos , Odontometría/métodos , Corona del Diente/diagnóstico por imagen , Estudios de Casos y Controles , Niño , Fisura del Paladar/patología , Oclusión Dental , Femenino , Humanos , Procesamiento de Imagen Asistido por Computador/métodos , Masculino , Maxilar , Estudios Retrospectivos , Corona del Diente/patología
2.
Acta Odontol Latinoam ; 32(2): 88-96, 2019 Aug 01.
Artículo en Inglés | MEDLINE | ID: mdl-31664299

RESUMEN

The aim of this study was to determine the differences in arch length, inter-canine distance, inter-premolar distance, intermolar distance and arch shape between dental discrepancies (crowding and spacing) in a sample of dental casts from the Afro-Colombian population of San Basilio de Palenque. An analytical, cross-sectional study was conducted on a convenience sample of 63 subjects aged 11 to 57years, of Afro-Colombian origin, with full dentition from first molar to first molar, without extensive caries or restorations, and excluding casts with defects due to loss. The differences between arch (upper and lower) variables were analyzed according to dental discrepancies. Plaster models digitalized with a TR1OS3 Mono scanner with exactitude (6.9 ± 0.9 pm) and precision (4.5 ± 0.9 pm) were analyzed with Orthonalyzer software. Statistical analyses were done on SPSS software (Version 20 for Windows) and Real Statistics. Spacing discrepancy of68.25% was found for upper arch and 66.66% for lower arch; crowding discrepancy of 19.04% for upper arch and 20.63% for lower arch, and an adequate ratio of 12.69% for both arches. No statistically significant difference (p>0.05) was found between arch parameters except for inter-premolar distance on the lower arch. The most frequent arch shape in the population was oval for both upper arch, with 76.19%, and lower arch, with 71.42%. Tooth size was larger in males than females but the difference was not statistically significant.


Asunto(s)
Arco Dental/patología , Maloclusión/etiología , Corona del Diente/patología , Adolescente , Adulto , Cefalometría/estadística & datos numéricos , Niño , Colombia/epidemiología , Estudios Transversales , Coronas , Modelos Dentales , Diastema/etiología , Femenino , Humanos , Masculino , Maloclusión/epidemiología , Maloclusión/patología , Maxilar/patología , Persona de Mediana Edad , Odontometría/estadística & datos numéricos , Tamaño de los Órganos , Adulto Joven
3.
Int Orthod ; 17(1): 45-52, 2019 03.
Artículo en Inglés | MEDLINE | ID: mdl-30773446

RESUMEN

The purpose of this study was to compare the effect of a 4-bracket system including Alexander, Roth, MBT (Maxillary Transverse Bioadaptation), and Gianelly on the upper anterior tooth movement in sliding mechanics with the help of a 3-Dimensional (3D) Finite Element Method. METHODS: Displacement, stress, strain, centre of rotation and resistance on the incise edge and apex of the maxillary central incisor were calculated when 100, 200, 300, 400grams of retraction force were applied. RESULTS: The amount of incise edge displacement was 2.609×10-4mm 2.682×10-4mm 2.875×10-4mm and 2.881×10-4mm in Alexander, Gianelly, Roth and MBT respectively with 100gr of retraction force. The value of apex root movement was 3.485×10-4mm 3.547×10-4mm 3.852×10-4mm and 3.864×10-4mm in Alexander, Gianelly, Roth and MBT respectively with 400g of retraction force. CONCLUSIONS: The MBT system had the maximum apex root and incisal edge movement in all 100, 200, 300, 400grams of retraction force. The Alexander system had the lowest apex and incisal edge movement in all retraction forces.


Asunto(s)
Procesamiento de Imagen Asistido por Computador/métodos , Imagenología Tridimensional/métodos , Métodos de Anclaje en Ortodoncia/métodos , Soportes Ortodóncicos , Técnicas de Movimiento Dental/métodos , Fenómenos Biomecánicos , Análisis de Elementos Finitos , Humanos , Incisivo , Maxilar , Fenómenos Mecánicos , Métodos de Anclaje en Ortodoncia/instrumentación , Diseño de Aparato Ortodóncico , Alambres para Ortodoncia , Ligamento Periodontal , Estrés Mecánico , Corona del Diente/patología , Técnicas de Movimiento Dental/instrumentación , Torque
4.
Bull Tokyo Dent Coll ; 60(1): 39-52, 2019 Feb 28.
Artículo en Inglés | MEDLINE | ID: mdl-30700640

RESUMEN

The goal of this study was to investigate how the height of the archwire hook and implant anchor affect tooth movement, stress in the teeth and alveolar bone, and the center of resistance during retraction of the entire maxillary dentition using a multibracket system. Computed tomography was used to scan a dried adult human skull with normal occlusion. Three-dimensional models of the maxillary bone, teeth, brackets, archwire, hook, and implant anchor were created and used for finite element analysis. The heights of the hook and the implant anchor were set at 0, 5, or 10 mm from the archwire. Orthodontic force of 4.9 N was systematically applied between the hook and the implant anchor and differential stress distributions and tooth movements observed for each traction condition. With horizontal traction, the archwire showed deformation in the superior direction anterior to the hook and in the inferior direction posterior to the hook. Differences in traction height and direction resulted in different degrees of deformation, with biphasic movement clearly evident both in front of and behind the hook. With horizontal traction of the hook at a height of 0 mm, all the teeth moved distally, but not with any other type of traction. At a height of 5 mm or 10 mm, deformation showed an increase. The central incisor showed extrusion under all traction conditions, with the amount showing a reduction as the height of horizontal or posterosuperior traction increased. The center of resistance was located at the root of the 6 anterior teeth and entire maxillary dentition. The present results suggest that it is necessary to consider deformation of the wire and the center of resistance during en-masse retraction with implant anchorage.


Asunto(s)
Análisis del Estrés Dental , Métodos de Anclaje en Ortodoncia/efectos adversos , Técnicas de Movimiento Dental/efectos adversos , Modelos Dentales , Análisis de Elementos Finitos , Humanos , Maloclusión/terapia , Maxilar , Métodos de Anclaje en Ortodoncia/instrumentación , Métodos de Anclaje en Ortodoncia/métodos , Alambres para Ortodoncia , Corona del Diente/patología , Técnicas de Movimiento Dental/instrumentación , Técnicas de Movimiento Dental/métodos
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 Prosthodont ; 28(2): e694-e698, 2019 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-29377452

RESUMEN

PURPOSE: Soft tissue interactions with ceramic dental implants have previously been shown to have favorable esthetic outcomes. This study aimed to evaluate the papilla-crown proportion around zirconia implants in a 3-year follow-up study and the correlation between the gingival biotype and changes in papillary height. MATERIALS AND METHODS: This was a prospective study of 39 patients with 40 single-gap implants (Straumann PURE Ceramic ZLA Implant). The papilla-crown proportion was assessed after 3 months, 1 year, and 3 years. In addition, correlations between the peri-implant biotypes and changes in papillary heights were evaluated. RESULTS: The papilla-crown proportion improved from 35.5% after 3 months to 41.7% after 3 years. The gingival biotype was correlated very weakly to papilla height alterations. Significant papillary fill was observed in the interdental space between 3 months and 3 years (p < 0.001). CONCLUSIONS: An ideal papilla-crown proportion of 40% around single implants was observed after 3 years. A thin or thick gingival biotype showed a very weak correlation with soft tissue alterations.


Asunto(s)
Implantes Dentales , Materiales Dentales , Papila Dental/patología , Corona del Diente/patología , Circonio , Implantación Dental Endoósea/efectos adversos , Implantes Dentales/efectos adversos , Estética Dental , Femenino , Estudios de Seguimiento , Encía/patología , Humanos , Masculino , Persona de Mediana Edad , Estudios Prospectivos
7.
Clin Oral Investig ; 23(5): 2097-2102, 2019 May.
Artículo en Inglés | MEDLINE | ID: mdl-30259191

RESUMEN

OBJECTIVES: The aim of this study was to evaluate the tooth crown discoloration induced by commonly used and new-generation endodontic sealers after 1 month and 1 and 3 years. MATERIALS AND METHODS: The crowns of 60 extracted incisors were cut and the pulp chambers were cleaned. The specimens were divided randomly into four groups (n = 15 each). Pulp chambers were filled with Pulpispad in group 1, AH26 in group 2, MTA Fillapex in group 3, and EndoREZ in group 4. Specimen color was measured with a spectrophotometer before and after sealer placement. Commission International de L'Eclairage's (CIE's) lighteness (L*), red-green (a*), yellow-blue (b*) color system values and color difference (ΔE) were recorded at 1 month and 1 and 3 years. Data were analyzed using repeated-measures analysis of variance and Tukey's honestly significant difference test (α = 0.05). RESULTS: All sealers caused discoloration. At 1 month, ΔE values were significantly higher in groups 1 and 2 than in groups 3 and 4 (p < 0.05). At 1 year, ΔE values were significantly lower in group 3 than in the other groups (p < 0.05). At 3 years, ΔE values were significantly higher in group 1 than in the other groups (p < 0.05). CONCLUSIONS: All tested sealers induced varying chromatic alterations. After root canal obturation, thorough debridement of sealers from the pulp chamber is essential for the prevention of sealer-induced discoloration. CLINICAL RELEVANCE: Tooth discoloration induced by endodontic materials is a problem for clinicians and patients and may impair the esthetic of endodontically treated teeth. Therefore, evaluation of long-term discoloration effects commonly used, and new-generation endodontic sealers were purposed in this study.


Asunto(s)
Materiales de Obturación del Conducto Radicular/efectos adversos , Corona del Diente/patología , Decoloración de Dientes/inducido químicamente , Resinas Compuestas/efectos adversos , Estética Dental , Humanos , Distribución Aleatoria , Cemento de Óxido de Zinc-Eugenol/efectos adversos
8.
Braz Oral Res ; 32(suppl 1): e75, 2018 Oct 18.
Artículo en Inglés | MEDLINE | ID: mdl-30365616

RESUMEN

Pulp canal obliteration (PCO) is a frequent finding associated with pulpal revascularization after luxation injuries of young permanent teeth. The underlying mechanisms of PCO are still unclear, and no experimental scientific evidence is available, except the results of a single histopathological study. The lack of sound knowledge concerning this process gives rise to controversies, including the most suitable denomination. More than a mere semantic question, the denomination is an important issue, because it reflects the nature of this process, and directly impacts the treatment plan decision. The hypothesis that accelerated dentin deposition is related to the loss of neural control over odontoblastic secretory activity is well accepted, but demands further supportive studies. PCO is seen radiographically as a rapid narrowing of pulp canal space, whereas common clinical features are yellow crown discoloration and a lower or non-response to sensibility tests. Late development of pulp necrosis and periapical disease are rare complications after PCO, rendering prophylactic endodontic intervention useless. Indeed, yellowish or gray crown discoloration may pose a challenge to clinicians, and may demand endodontic intervention to help restore aesthetics. This literature review was conducted to discuss currently available information concerning PCO after traumatic dental injuries (TDI), and was gathered according to three topics: I) physiopathology of PCO after TDI; II) frequency and predictors of pulpal healing induced by PCO; and III) clinical findings related to PCO. Review articles, original studies and case reports were included aiming to support clinical decisions during the follow-up of teeth with PCO, and highlight future research strategies.


Asunto(s)
Cavidad Pulpar/lesiones , Enfermedades de la Pulpa Dental/etiología , Dentición Permanente , Avulsión de Diente/complicaciones , Fracturas de los Dientes/complicaciones , Cavidad Pulpar/diagnóstico por imagen , Cavidad Pulpar/patología , Enfermedades de la Pulpa Dental/patología , Humanos , Radiografía Dental , Avulsión de Diente/diagnóstico por imagen , Avulsión de Diente/patología , Corona del Diente/patología , Decoloración de Dientes/etiología , Fracturas de los Dientes/diagnóstico por imagen , Fracturas de los Dientes/patología
9.
Gerodontology ; 35(2): 95-100, 2018 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-29368792

RESUMEN

OBJECTIVE: This study aimed to identify the changes in the time-dependent deformation response of coronal dentin with ageing and its relationship with changes in chemical composition. BACKGROUND: The structural behaviour of dentin with ageing is affected by changes in the density and diameter of its dentinal tubules (ie porosity), as well as changes in chemical composition throughout the tooth. However, little is known about the time-dependent deformation behaviour of aged dentin and the importance of its hierarchical structure and variations in chemical composition. MATERIALS AND METHODS: The spherical indentation response of aged coronal dentin was analysed in the outer, middle and inner regions, and its time-dependent deformation response was modelled in terms of its microstructure and chemical composition using a model recently proposed for young dentin. RESULTS: The viscous deformation behaviour of aged dentin followed a power-law response with a decrease in the stress exponent when compared to young dentin. These results can be explained by cross-linking of the collagen present in the tissue. CONCLUSION: A decrease in the deformation ability of aged dentin was found. This behaviour could be a result of a dissolution process and reprecipitation of the minerals present in intertubular dentin into the dentinal tubules.


Asunto(s)
Dentina/patología , Corona del Diente/patología , Factores de Edad , Anciano , Anciano de 80 o más Años , Envejecimiento , Colágeno/metabolismo , Análisis del Estrés Dental , Femenino , Humanos , Masculino , Persona de Mediana Edad , Espectrometría Raman
10.
J Investig Clin Dent ; 9(2): e12303, 2018 May.
Artículo en Inglés | MEDLINE | ID: mdl-29055115

RESUMEN

AIM: The aim of the present study was to determine the prevalence, location, size, and tooth type of pre-eruptive intracoronal radiolucencies (PEIR) from panoramic radiographs in Thai patients. METHODS: A retrospective study of PEIR was conducted on 1599 panoramic radiographs of 629 Thai males and 970 Thai females with an age range of 4-20 years (average age: 14.0 ± 4.0 years). Each radiograph was reviewed by two calibrated examiners. The age and sex of the patients, location, size, and tooth type of the lesions were recorded. The SPSS program was used for statistical analysis. RESULTS: The PEIR were found in 0.32% of tooth samples (29/9060) and 1.63% of patients (26/1599). There was no statistical difference in the presence of PEIR between both sexes. The mandibular second molars were the most affected teeth. The lesions were mostly located at the central part of the crown. The lesion sizes were mostly limited to less than one-third of dentinal thickness. CONCLUSIONS: The present study showed that the prevalence of PEIR in Thai samples is 1.63%. This could raise dentists' awareness in reviewing unerupted teeth in panoramic radiographs. Early detection of the lesions should aid in proper treatment planning of affected teeth to prevent complications from carious invasion after tooth eruption.


Asunto(s)
Radiografía Panorámica , Corona del Diente/diagnóstico por imagen , Corona del Diente/patología , Diente no Erupcionado/diagnóstico por imagen , Diente no Erupcionado/patología , Adolescente , Niño , Preescolar , Femenino , Humanos , Masculino , Prevalencia , Estudios Retrospectivos , Tailandia/epidemiología , Diente no Erupcionado/epidemiología , Adulto Joven
11.
Int J Esthet Dent ; 12(3): 352-376, 2017.
Artículo en Inglés | MEDLINE | ID: mdl-28717793

RESUMEN

The process of tooth eruption consists of two phases, active and passive. While the distinction is unequivocal, the mechanism is ambiguous. This article compares and contrasts altered passive eruption (APE) and active secondary eruption (ASE). Although these phases present with similar clinical manifestations, each has its own etiology, physiogenesis, and pathogenesis. Furthermore, the differential diagnosis between the two, and that between other mirroring conditions, is essential for arriving at a definite diagnosis and correct treatment strategies, which may be similar but have different consequences. This article concludes with two case studies that show the management of APE and ASE, highlighting the treatment similarities and differences that are dependent on the specific etiology.


Asunto(s)
Estética Dental , Maxilar , Corona del Diente/patología , Erupción Dental , Alargamiento de Corona , Diagnóstico Diferencial , Humanos , Sonrisa
12.
J Am Dent Assoc ; 148(10): 737-742, 2017 10.
Artículo en Inglés | MEDLINE | ID: mdl-28624073

RESUMEN

BACKGROUND: In this study, the authors investigated whether extension of a tooth crack into the root can be predicted by the appearance of the crack in the crown in vitro. METHODS: The authors obtained 22 cracked teeth from 22 patients who underwent extraction, and they scanned the teeth using microcomputed tomography. The length and width of the crack on the occlusal surface (LOS and WOS, respectively) and the length of the crack on the proximal surface (LCPS) were measured on 3-dimensional reconstruction images. The pulp chamber roof was penetrated and removed. A crack line visible under the microscope only on the access cavity wall rather than extending to the bottom of the pulp chamber was termed a "nonroot crack." A crack seen at the bottom of the pulp chamber or root wall was termed a "root crack." The authors analyzed the data using Pearson correlation coefficients and receiver operating characteristic curves. RESULTS: There was a significant correlation between the LOS and LCPS (correlation coefficient, 0.782; P < .001) and between the WOS and LCPS (correlation coefficient, 0.651; P < .05). The LCPS increased by 1.195 millimeters for every 1-mm increase in the LOS. The area under the receiver operating characteristic curve was 0.839 (95% confidence interval, 0.659 to 1.000) for LOS and 0.760 (95% confidence interval, 0.557 to 0.964) for WOS. CONCLUSIONS: The extent of a crown crack may indicate how far the crack extends to the root. Both the LOS and WOS may be valuable for assessing whether a crack involves the root, although the LOS seems to be more useful. PRACTICAL IMPLICATIONS: The dimensions of a crack in a crown provide a helpful approach for predicting the depth of the crack and its likely prognosis.


Asunto(s)
Síndrome de Diente Fisurado/diagnóstico , Corona del Diente/patología , Raíz del Diente/lesiones , Síndrome de Diente Fisurado/diagnóstico por imagen , Síndrome de Diente Fisurado/patología , Humanos , Imagenología Tridimensional , Técnicas In Vitro , Corona del Diente/diagnóstico por imagen , Raíz del Diente/diagnóstico por imagen , Raíz del Diente/patología , Microtomografía por Rayos X
13.
Stomatologiia (Mosk) ; 96(3): 18-22, 2017.
Artículo en Ruso | MEDLINE | ID: mdl-28617401

RESUMEN

The aim of the study was to reveal correlation of dental morphology and bioelectric activity of masticatory muscles. The study included 76 young adults (47.4% females and 52.6% males) divided in 3 groups according to dental morphology features: intact teeth (26 patients), dental decay in fissures with intact cusps (25 patients), pronounced dental decay with varying degree of crown destruction (25 patients). Electromyography (EMG) was used to document the bioelectric activity (BEA) of temporal and masticatory muscles. The study showed high level of correlation of destructive teeth changes with BEA of masticatory muscles. Intragroup correlation proved direct link of BEA to the number of decayed teeth. EMG activity differed significantly between groups 2 and 3. There was no statistically significant difference between groups 3 and 1 mostly because of high variability of BEA in group 3. Relative activity of temporal and masticatory muscles increased in groups 2 and 3 by 2 and 4% and 38 and 19%, correspondingly. There was no significant impact of gender or emotional status on masticatory muscles BEA.


Asunto(s)
Electromiografía , Músculo Masetero/fisiopatología , Músculo Temporal/fisiopatología , Diente/patología , Adulto , Caries Dental/patología , Fisuras Dentales/patología , Oclusión Dental , Emociones , Femenino , Humanos , Masculino , Músculo Masetero/patología , Factores Sexuales , Músculo Temporal/fisiología , Diente/anatomía & histología , Corona del Diente/patología , Adulto Joven
14.
Am J Orthod Dentofacial Orthop ; 151(5): 860-868, 2017 May.
Artículo en Inglés | MEDLINE | ID: mdl-28457263

RESUMEN

INTRODUCTION: The aim of this study was to analyze the development and stability of roots and alveolar bone in orthodontically treated labial inversely impacted maxillary central incisors in a long-term follow-up by cone-beam computed tomography. Comparisons were made between the labial inversely impacted maxillary central incisors after treatment and normally erupted mature contralateral incisors. METHODS: The sample consisted of 12 participants, with a mean age of 7.80 ± 0.91 years. Cone-beam computed tomography scanning data at the completion of treatment and the long-term follow-up were available for each participant.The mean length of follow-up was 24.57 ± 4.33 months. Root length, crown height, root canal width, labial/lingual alveolar bone vertical loss, and bone thickness of the impacted and contralateral incisors were measured with the SimPlant Pro program (version 13.0; Materialise Dental, Leuven, Belgium). RESULTS: In the follow-up, the root lengths of both the labial inversely impacted dilacerated maxillary central incisors (10.99 ± 1.96 mm) and the contralateral mature maxillary central incisors (11.65 ± 1.37 mm) were significantly longer than at posttreatment (8.37 ± 1.74 mm and 9.81 ± 1.65 mm, respectively). The root canal widths of the impacted and contralateral incisors were significantly narrower during the follow-up. The size of the angle between the long axis of the crown and apical third of the root decreased significantly. The lingual alveolar bone loss of the impacted incisors was greater than that of the contralateral incisors. The labial bone thickness at the apex of the impacted incisors increased significantly during the follow-up period. CONCLUSIONS: The treated labial inversely impacted maxillary central incisors had continuous and similar growth as did the mature contralateral incisors in the follow-up period. The roots had an increase in length and a change in direction of the apex, with a relatively stable condition of the surrounding alveolar bone. Neither the labial inversely impacted maxillary central incisors nor the contralateral incisors had further alveolar bone loss.


Asunto(s)
Incisivo/patología , Diente Impactado/patología , Niño , Tomografía Computarizada de Haz Cónico , Femenino , Estudios de Seguimiento , Humanos , Incisivo/diagnóstico por imagen , Masculino , Estudios Retrospectivos , Corona del Diente/diagnóstico por imagen , Corona del Diente/patología , Raíz del Diente/diagnóstico por imagen , Raíz del Diente/patología , Diente Impactado/diagnóstico por imagen
15.
J Vet Dent ; 34(1): 8-17, 2017 03.
Artículo en Inglés | MEDLINE | ID: mdl-28446072

RESUMEN

Biomechanical studies of the elongated canine tooth of animals are few, and thus our understanding of mechanical and physical properties of animal teeth is limited. The objective of the present study was to evaluate the influence of force direction on fracture resistance and fracture pattern of canine teeth in an ex vivo dog cadaver model. Forty-five extracted canine teeth from laboratory beagle dogs were standardized by hard tissue volume and randomly distributed among 3 force direction groups. The teeth were secured within a universal testing machine and a load was applied at different directions based on testing group. The maximum force to fracture and the fracture pattern classification were recorded for each tooth. After correcting for hard tissue cross-sectional area in a multivariate analysis, no significant difference in the amount of force required for fracture was apparent between the different force direction groups. However, the influence of force direction on fracture pattern was significant. The results of this study may allow the clinician to educate clients on possible causal force directions in clinically fractured teeth and, thus, help prevent any contributing behavior in the future.


Asunto(s)
Diente Canino/patología , Perros/lesiones , Corona del Diente/patología , Fracturas de los Dientes/veterinaria , Animales , Fenómenos Biomecánicos , Cadáver , Diente Canino/lesiones , Estrés Mecánico , Corona del Diente/lesiones , Fracturas de los Dientes/etiología , Fracturas de los Dientes/patología
16.
Artículo en Inglés | MEDLINE | ID: mdl-28196166

RESUMEN

This article presents a clinical protocol to reconstruct two accidentally damaged maxillary central incisors using composite resin material and a fractured tooth component. A patient was referred to the clinic with fracture of the two maxillary central incisors. Clinical examination revealed that both teeth were fractured in the middle third of the crown and that the fractures involved enamel and dentin with no pulp exposure. The patient had also suffered a lower lip laceration. When the lip was evaluated, a fractured fragment of the maxillary right central incisor was found inside the wound. The missing part of the tooth was replaced via adhesive attachment. Due to the damage of the fractured part of the maxillary left central incisor, direct composite restoration of this tooth was performed. With the advent of adhesive dentistry, the process of fragment reattachment has become simplified and more reliable. This procedure provides improved function, is faster to perform, and provides long-lasting effects, indicating that reattachment of a coronal fragment is a realistic alternative to placement of conventional resin composite restorations.


Asunto(s)
Resinas Compuestas , Restauración Dental Permanente/métodos , Salud Holística , Incisivo/lesiones , Fracturas de los Dientes/terapia , Grabado Ácido Dental , Adulto , Resinas Compuestas/química , Recubrimiento Dental Adhesivo/métodos , Esmalte Dental/química , Esmalte Dental/lesiones , Dentina/química , Dentina/lesiones , Recubrimientos Dentinarios , Estética Dental , Femenino , Humanos , Incisivo/diagnóstico por imagen , Incisivo/patología , Laceraciones , Labio/diagnóstico por imagen , Labio/lesiones , Maxilar , Cementos de Resina , Corona del Diente/lesiones , Corona del Diente/patología
17.
Aust Dent J ; 62(2): 223-227, 2017 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-27471145

RESUMEN

Radiolucent or hypodense lesions in the crown of unerupted teeth may be due to pre-eruptive intracoronal resorption. Clinicians must be aware of this risk so that they can diagnose and appropriately treat this condition. The purpose of this study is to present a well-documented clinical case of pre-eruptive intracoronal resorption in an impacted third upper left molar of a 63 year old female patient. This was an unexpected finding, which occurred after cone-beam computed tomography was used to investigate the first upper left molar, which had an acute periradicular abscess. A multidisciplinary team followed up the case to describe clinical, radiographic and histological findings. The available treatment options were discussed, and the tooth extraction was the option chosen. Previous case studies describing such resorption in third upper molars have not been reported. This case shows that all permanent teeth in a pre-eruptive stage must be analysed radiographically to detect early pre-eruptive intracoronal resorption.


Asunto(s)
Corona del Diente/patología , Resorción Dentaria , Diente no Erupcionado/patología , Absceso/diagnóstico por imagen , Absceso/etiología , Tomografía Computarizada de Haz Cónico , Dentición Permanente , Femenino , Humanos , Persona de Mediana Edad , Diente Molar , Tercer Molar , Tomografía Computarizada por Rayos X , Corona del Diente/diagnóstico por imagen , Erupción Dental , Extracción Dental , Diente Impactado/patología
18.
Braz. dent. sci ; 20(1): 6-11, 2017. Tab, ilus
Artículo en Inglés | LILACS, BBO - Odontología | ID: biblio-834113

RESUMEN

Objective: This study aimed to compare the fracture resistance of endodontically treated roots filled by different obturation systems. Material and methods: Ninety-six maxillary central incisors were used and decoronated, retaining 12 mm of the roots. On the basis of obturation systems, the roots were randomly divided into 4 groups (n=24): Group1 (COGR): control group (unprepared, unfilled), Group 2 (AVGR): ActiV GP points/ActiV GP sealer, Group 3 (GPGR): Gutta percha points / AH plus sealer, and Group4 (GAGR): Gutta percha points/ActiV GP sealer. The last three groups were obturated with the single cone technique. The roots were then stored in 100% relative humidity at 37 °C for 2 weeks. A vertical compressive force was exerted in a universal testing machine until fracture occurred. Data were statistically analyzed using one-way ANOVA. Results: Mean (SD) failure loads for groups ranged from 920.51 ± 210.37 to 1113.44 ± 489.42 N. The fracture resistance between the different study groups indicated no statistical difference (p>0.05). Conclusions: ActiV GP system did not exert a significant effect on the fracture resistance of endodontically treated teeth.(AU)


Objective: Comparar a resistência à fratura de raízes tratadas endodonticamente obturadas através de diferentes sistemas. Materiais e Métodos: Noventa e seis incisivos centrais superiores foram utilizados, tiveram as coroas removidas, restando 12 mm de raíz. De acordo com o sistema de obturação, as raízes foram divididas em 4 grupos (n=24): Grupo1 (COGR): grupo controle (sem preparo, sem preenchimento), Grupo2 (AVGR): cones ActiV GP / cimento ActiV GP, Grupo3 (GPGR): cones de guta percha / cimento AH plus, e Grupo4 (GAGR): cones de guta percha / cimento ActiV GP. Os últimos três grupos foram obturados através da técnica de cone único. As raízes foram armazenadas em 100% de umidade relativa a 37 °C durante 2 semanas. Uma força compressiva vertical foi aplicada através de uma máquina de ensaio universal até ocorrer fratura. Os dados foram analisados estatisticamente através de ANOVA ­ 1 fator. Resultados: A carga média (SD) obtida no momento da falha variou entre 920.51 ± 210.37 até 1113.44 ± 489.42 N. A resistência à fratura entre os diferentes grupos estudados não indicaram diferença estatística. Conclusão: O sistema ActiV GP não exerceu um efeito significante na resistência à fratura em dentes tratados endodonticamente.(AU)


Asunto(s)
Humanos , Cementos Dentales/uso terapéutico , Restauración Dental Permanente/efectos adversos , Gutapercha/uso terapéutico , Fracturas de los Dientes/tratamiento farmacológico , Diente no Vital/tratamiento farmacológico , Análisis de Varianza , Cementos Dentales/farmacología , Reparación de Restauración Dental/métodos , Corona del Diente/patología
19.
Rom J Morphol Embryol ; 57(2 Suppl): 729-735, 2016.
Artículo en Inglés | MEDLINE | ID: mdl-27833965

RESUMEN

The research aims at emphasizing the interrelation between the social impact and the self-esteem of schoolchildren with dental crown fractures in the frontal group. Dental traumatic injuries are frequently met to schoolchildren, therefore, the prevention and interception of traumatic pathology within parents, teachers and children is more than necessary. Our statistical study intends to determine the prevalence of dental trauma to southwestern Romanian schoolchildren aged 6 to 14. The survey included a number of 1684 schoolchildren attending public schools, randomly chosen. Data were collected from October 2012 to December 2013. Clinical examination was conducted to assess the dental traumatic injuries. Age and gender distribution, etiological factors, risk factors and the cause of injuries were the parameters taken into consideration. The data collected was processed and analyzed using the SPSS (Statistical Package for the Social Sciences) statistical software. The overall prevalence of dental trauma was 4.63% amongst the subjects examined. The maxillary central incisor was the most commonly affected tooth (85.19% in boys and 97.87% in girls). We observed a significant statistical difference in the number of children with one, two or three fractured teeth from the urban and rural areas. The percentage of schoolchildren with crown fractures that we examined was of 3.09% in the urban area and 1.54% in the rural area. The traumatic injuries of the maxillary upper teeth were most prevalent. Since the dental trauma of incisors has a strong impact on the quality of life of children and their families, health preventive policies are needed in order to avoid psychological implications on the lifelong existence of children affected.


Asunto(s)
Periodoncio/patología , Instituciones Académicas , Corona del Diente/lesiones , Traumatismos de los Dientes/epidemiología , Adolescente , Niño , Femenino , Humanos , Incisivo/lesiones , Masculino , Periodoncio/irrigación sanguínea , Prevalencia , Población Rural/estadística & datos numéricos , Corona del Diente/patología , Fracturas de los Dientes/epidemiología , Fracturas de los Dientes/patología , Población Urbana/estadística & datos numéricos
20.
J Clin Pediatr Dent ; 40(6): 496-502, 2016.
Artículo en Inglés | MEDLINE | ID: mdl-27805893

RESUMEN

OBJECTIVE: Most cases of hypophosphatasia (HPP) exhibit early loss of primary teeth. Results of micro-computed tomography (micro-CT) analysis of teeth with HPP have not yet been reported. The purpose of the present study was to describe the size and mineral density distribution and mapping of exfoliated teeth with HPP using micro CT. STUDY DESIGN: Seven exfoliated teeth were obtained from a patient with HPP. Exfoliated teeth sizes were measured on micro CT images and mineral densities of the mandibular primary central incisors were determined. RESULTS: Partial dentures were fabricated for the patient to replace the eight primary teeth which had exfoliated. Most primary teeth sizes were within the normal range. The mean values of enamel and dentin mineral densities in teeth with HPP were 1.35 and 0.88 g/cm3, respectively, in the mandibular primary central incisors. CONCLUSION: Mineral density distribution and mapping revealed that the values in teeth with HPP were lower than the homonymous teeth controls in all regions from the crown to apex. Furthermore, it was demonstrated that the differences between HPP and controls were larger on the crown side and the differences tended to converge on the apex side. These results suggested that the present patient showed mild hypomineralization in the primary dentition.


Asunto(s)
Hipofosfatasia/patología , Calcificación de Dientes/fisiología , Diente Primario/patología , Esmalte Dental/patología , Dentina/patología , Humanos , Hipofosfatasia/metabolismo , Procesamiento de Imagen Asistido por Computador/métodos , Lactante , Masculino , Minerales/análisis , Odontometría/métodos , Cuello del Diente/patología , Corona del Diente/patología , Exfoliación Dental , Diente Primario/química , Microtomografía por Rayos X/métodos
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