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1.
Artículo en Inglés | MEDLINE | ID: mdl-33819322

RESUMEN

The purpose of this study was to evaluate vertical and horizontal alveolar resorption after the extraction of eight single maxillary molars using solvent-dehydrated bone allograft (Puros) covered with a nonresorbable membrane for ridge preservation. At implant placement 4 months later, ridge dimensions were measured clinically and radiographically and compared to baseline, and a histologic analysis was performed. The mean buccal height decreased by 1.51 mm at midpoint, 0.88 mm mesially, and 1.16 mm distally. The implants were placed without additional ridge augmentation, and six of eight required an internal sinus elevation. Within the limits of this study, this technique succeeded in preserving the alveolar bone.


Asunto(s)
Aumento de la Cresta Alveolar , Tomografía Computarizada de Haz Cónico Espiral , Aloinjertos , Proceso Alveolar/diagnóstico por imagen , Proceso Alveolar/cirugía , Trasplante Óseo , Humanos , Diente Molar/diagnóstico por imagen , Diente Molar/cirugía , Proyectos Piloto , Politetrafluoroetileno , Solventes , Extracción Dental , Alveolo Dental/cirugía
2.
Artículo en Inglés | MEDLINE | ID: mdl-33819330

RESUMEN

Immediate implant placement in molar sites has the potential to improve the patient experience by reducing the number of appointments and the overall treatment time. However, primary closure remains a technical challenge. The present prospective case series evaluated the soft tissue contours and the radiographic bone levels of 17 patients who received immediate implants in molar sites and a digitally customized CAD/CAM sealing socket abutment. At the 2-year follow-up, the mean buccal tissue contours at the most coronal portion were reduced horizontally by an average of 1 mm at 1, 2, 3, and 4 mm below the gingival margin. A mean 0.53-mm apical migration of the gingival margin was seen, and the mean interproximal bone level at the 2-year follow-up was 0.89 mm. The use of CAD/CAM-generated customized healing abutments in immediate molar sites yielded minimal hard and soft tissue changes at the 2-year follow-up.


Asunto(s)
Implantes Dentales de Diente Único , Implantes Dentales , Pilares Dentales , Implantación Dental Endoósea , Humanos , Diente Molar/diagnóstico por imagen , Diente Molar/cirugía , Estudios Prospectivos , Alveolo Dental/cirugía
3.
Orthod Craniofac Res ; 24 Suppl 1: 31-38, 2021 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-33652500

RESUMEN

INTRODUCTION: The purpose of this study was to evaluate the long-term position of erupted third molars after maxillary total arch distalization using modified C-palatal plates (MCPPs) in adolescents and to identify factors associated with these positions. SETTING AND SAMPLE POPULATION: Sixty-two third molars (male: 20, female: 42) in Class II patients treated with MCPPs and thirty-nine teeth for the Control group (male: 22, female: 17). MATERIALS AND METHODS: Samples were analyzed using panoramic radiographs taken initially (T0), after treatment (T1) and after >3 years retention (T2). Third molars were classified as downward (Group A, N = 31; males: 12, females: 19) and upward (Group B, N = 31; males: 8, females: 23) based on their vertical position after treatment. Analysis of variance and multiple logistic regression analysis were performed. RESULTS: The vertical position of the third molars of Group A, Group B, and the Control showed a 2.2, 3.5 and 2.7 mm downward movement at T2. However, there was no difference in the amount of third molar eruption among the groups. Regarding factors affecting the vertical distance of the third molar, Age, C8-OP, ∠8-OP and D7-T at the initial affected vertical position of the third molars after molar distalization (P < .05). CONCLUSIONS: Group A and B showed no difference in the third molar eruption during retention after total arch distalization. This study suggests that it might be unnecessary to extract the developing third molar before molar distalization in Class II adolescents.


Asunto(s)
Maloclusión de Angle Clase II , Tercer Molar , Adolescente , Cefalometría , Femenino , Humanos , Masculino , Maxilar/diagnóstico por imagen , Diente Molar/diagnóstico por imagen , Tercer Molar/diagnóstico por imagen , Tercer Molar/cirugía , Técnicas de Movimiento Dental
4.
Int J Mol Sci ; 22(4)2021 Feb 17.
Artículo en Inglés | MEDLINE | ID: mdl-33671455

RESUMEN

After avulsion and replantation, teeth are at risk of bone and root resorption. The present study aimed to demonstrate that the intra-nuclear transducible form of transcription modulation domain of p65 (nt-p65-TMD) can suppress osteoclast differentiation in vitro, and reduce bone resorption in a rat model of tooth replantation. Cell viability and nitric oxide release were evaluated in RAW264.7 cells using CCK-8 assay and Griess reaction kit. Osteoclast differentiation was evaluated using quantitative reverse transcriptase-polymerase chain reaction (RT-PCR) and tartrate-resistant acid phosphatase (TRAP) staining. Thirty-two maxillary rat molars were extracted and stored in saline (n = 10) or 10 µM nt-p65-TMD solution (n = 22) before replantation. After 4 weeks, specimens were scored according to the inflammatory pattern using micro-computed tomography (CT) imaging and histological analyses. nt-p65-TMD treatment resulted in significant reduction of nitric oxide release and osteoclast differentiation as studied using PCR and TRAP staining. Further, micro-CT analysis revealed a significant decrease in bone resorption in the nt-p65-TMD treatment group (p < 0.05). Histological analysis of nt-p65-TMD treatment group showed that not only bone and root resorption, but also inflammation of the periodontal ligament and epithelial insertion was significantly reduced. These findings suggest that nt-p65-TMD has the unique capabilities of regulating bone remodeling after tooth replantation.


Asunto(s)
Núcleo Celular/metabolismo , Reimplante Dental , Factor de Transcripción ReIA/metabolismo , Animales , Diferenciación Celular , Supervivencia Celular , Ratones , Modelos Animales , Diente Molar/diagnóstico por imagen , Óxido Nítrico/metabolismo , Osteoclastos/metabolismo , Células RAW 264.7 , Ratas , Transducción Genética , Microtomografía por Rayos X
5.
J Clin Pediatr Dent ; 45(1): 22-28, 2021 Jan 01.
Artículo en Inglés | MEDLINE | ID: mdl-33690822

RESUMEN

OBJECTIVE: To determine the clinical and radiographic success of Biodentine® (BD) and Ferric Sulfate (FS) as primary molar pulpotomy materials and to compare their outcomes. STUDY DESIGN: Retrospective data was obtained from the electronic health records (EHR) of a university-based pediatric dental clinic. Participants were enrolled according to specified inclusion and exclusion criteria. Two trained and calibrated examiners evaluated the EHR using validated criteria for clinical and radiographic outcomes. Study data was numerically coded and analyzed. Cohen's Kappa and Chi-square tests were used (p<0.05). RESULTS: Eighty-three participants (62.7% females, age range two to eight years, average age of 4.5 years) with 102 pulpotomies were enrolled. FS was used in 78% (n=79) and BD in 22% (n=23) of the cases. Follow-up periods ranged from six to 36 months (mean of 17 months). BD showed 100% clinical and radiographic success, while FS demonstrated 84% clinical and 70% radiographic success. The two groups were compared at one year with no statistically significant differences. At 18 months, BD outperformed FS clinically (p=.012) and radiographically (p=.001). Intra-rater and inter-rater agreement were κ>0.88. CONCLUSIONS: Both materials can be recommended for clinical practice, however BD may be the preferred choice for its better outcomes at 18 months.


Asunto(s)
Compuestos de Calcio , Pulpotomía , Niño , Preescolar , Combinación de Medicamentos , Femenino , Compuestos Férricos/uso terapéutico , Humanos , Masculino , Diente Molar/diagnóstico por imagen , Diente Molar/cirugía , Estudios Retrospectivos , Silicatos/uso terapéutico , Diente Primario , Resultado del Tratamiento
6.
Gen Dent ; 69(2): 64-68, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33661118

RESUMEN

Taurodontism, usually associated with genetic disorders, is an anomaly in dental development in which the tooth presents with a vertically elongated pulp chamber due to an invagination failure of the Hertwig epithelial sheath. This article presents 2 case reports describing the endodontic treatment of permanent taurodontic molars in systemically healthy patients. In case 1, a maxillary left first molar presented with hypertaurodontism and 5 root canals. In case 2, a mandibular left second molar presented with hypertaurodontism and a C-shaped canal. Treatment of both teeth was based on careful radiographic evaluation with magnification, which allowed the root canal orifices to be identified and the endodontic treatment to be performed. Chemical-mechanical preparation was performed with mechanized instruments and a 2.5% sodium hypochlorite solution. As an auxiliary protocol to finish cleaning, passive ultrasonic irrigation was performed, and a thermoplastic filling technique was used. When complex internal anatomy and accessory root canals are present, endodontic treatment of a tooth presenting with hypertaurodontism can be challenging. Given the complexities of the present cases, the positive outcomes can be attributed to the use of magnification during endodontic procedures and meticulous attention to tooth preparation and obturation techniques.


Asunto(s)
Cavidad Pulpar , Anomalías Dentarias , Cavidad Pulpar/diagnóstico por imagen , Humanos , Diente Molar/diagnóstico por imagen , Preparación del Conducto Radicular , Tratamiento del Conducto Radicular , Anomalías Dentarias/diagnóstico por imagen , Anomalías Dentarias/terapia
7.
Pediatr Dent ; 43(1): 28-33, 2021 Jan 15.
Artículo en Inglés | MEDLINE | ID: mdl-33662247

RESUMEN

Purpose: The purposes of this study were to determine the presence of interproximal carious lesions in the primary molars and assess the risk to adjacent and contralateral surfaces when caries is detected in one quadrant. Methods: Clinical records of high caries-risk children, including bitewing radiographs, were assessed for interproximal caries and the extent of marginal ridge breakdown. The carious lesions were scored radiographically by two calibrated examiners with excellent inter- and intraexaminer reliability. Correlations for the presence of adjacent surface caries and caries in another quadrant were determined by employing the strength of the associations, as quantified using chi-square analysis. Results: A total of 1,290 pairs of primary molars (A and B, I and J, K and L, S and T) were included. Only eight percent of interproximal surfaces were caries-free. Approximately 70 percent of the adjacent surfaces (A and B, I and J, K and L, and S and T) exhibited carious lesions in the enamel when there was enamel caries in one quadrant. Furthermore, 90 percent of the adjacent surfaces exhibited caries in the dentin if one adjacent interproximal surface exhibited dentinal caries. Conclusions: In high caries-risk children, only a small proportion of surfaces remain caries-free, and the adjacent surface caries prevalence remains high at 70 percent to 80 percent. The presence of interproximal caries in one quadrant is a good indicator of caries in the other quadrants, as is the marginal ridge breakdown which indicates the proximity to the pulp.


Asunto(s)
Caries Dental , Diente Primario , Niño , Caries Dental/diagnóstico por imagen , Esmalte Dental/diagnóstico por imagen , Humanos , Diente Molar/diagnóstico por imagen , Radiografía de Mordida Lateral , Reproducibilidad de los Resultados
8.
Eur J Paediatr Dent ; 22(1): 19-25, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33719478

RESUMEN

AIM: There is insufficient evidence on the outcome of pulpotomies in carious exposed young permanent molars with newer biomaterials. This study aimed to compare Mineral Trioxide Aggregate (MTA) and Biodentine as pulpotomy materials in carious exposed vital immature mandibular first permanent molars. MATERIALS AND METHODS: Study design: Sixty immature first mandibular permanent molars, with carious exposure were randomly assigned to an MTA or Biodentine group in a split-mouth design. After the amputation of the coronal pulp, the pulp stumps were covered with one of the study materials and coronal restorations placed. Blinded clinical and radiographic evaluations were performed at baseline. Following this there were evaluations at 6, 12 and 18 months where comparisons between and within the two groups were made. RESULTS: A high success was observed in both groups for all outcome measures for clinical success, with no significant difference between them. The mean survival time for the Biodentine and MTA groups was (17.8 and 18 months) with 95% confidence interval (17.4-18.2) and (18 .0-18.0) months respectively. Similarly, there were no significant differences between the Biodentine and MTA groups for radiographic success (P<0.001) with an increase in root length and increasing apical closure observed in both groups. CONCLUSIONS: Both materials were equally effective in the treatment of cariously exposed vital immature mandibular first permanent molars.


Asunto(s)
Materiales de Recubrimiento Pulpar y Pulpectomía , Pulpotomía , Compuestos de Aluminio/uso terapéutico , Compuestos de Calcio , Combinación de Medicamentos , Humanos , Diente Molar/diagnóstico por imagen , Diente Molar/cirugía , Óxidos/uso terapéutico , Materiales de Recubrimiento Pulpar y Pulpectomía/uso terapéutico , Silicatos/uso terapéutico , Resultado del Tratamiento
9.
Niger J Clin Pract ; 24(3): 435-442, 2021 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-33723120

RESUMEN

Aims: To investigate the root canal anatomy and the incidence of fused roots in maxillary first molar (MFM) and maxillary second molar (MSM) teeth in the Turkish population and compare them to teeth with separate roots using cone-beam computed tomography (CBCT). Methods: CBCT images of 616 MFMs and 703 MSMs were analyzed from 402 patients for the number of roots and the presence of fusion. The canal configuration of teeth with separate and fused roots was compared. Type of fusion and canal merging positions were determined. A P value of less than 0.05 was considered significant. Results: Five hundred and seventy-one (92.69%) MFMs had three separate roots, one (0.16%) had four roots and the incidence of root fusion was 7.14%. An additional mesiobuccal (MB) canal was present in 79.34% of the teeth with three separate roots. There was no merging of canals in 36 of 44 teeth with fused roots. The prevalence of fusion was higher in the MSMs (23.47%). The incidence of three and four separate roots in MSM teeth was 74.68% and 1.85%, respectively. The prevalence of additional MB canals in teeth with three separate roots was 53.14%. There was no canal merging in 60% of the fused rooted teeth. There were two-merged canals in 31.52% and multiple merged canals in 8.48% of the MSMs. Conclusions: In the Turkish population, the incidence of root fusion in the MFMs and MSMs was 7.14% and 23.47%, respectively, with more canal merging in the MSMs.


Asunto(s)
Homosexualidad Masculina , Minorías Sexuales y de Género , Tomografía Computarizada de Haz Cónico , Cavidad Pulpar/diagnóstico por imagen , Humanos , Masculino , Maxilar/diagnóstico por imagen , Diente Molar/diagnóstico por imagen , Raíz del Diente/diagnóstico por imagen
10.
Am J Orthod Dentofacial Orthop ; 159(2): e169-e177, 2021 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-33546831

RESUMEN

INTRODUCTION: The present study aimed to analyze possible factors involved in irreversible (IRR) ectopic eruption (EE) of the first permanent molar and explore potential predictors for the IRR outcome. METHODS: Children aged 4-11 years, with at least 1 EE and who took their first panoramic radiograph before the age of 8 years, were selected in this study. The subjects were assigned to the self-correcting (SC) and IRR groups. Patients' age, sex, distribution of EE, and accompanying dental anomalies were recorded. Eruptive angulation (EA) of the first permanent molar, the grade of root resorption in the second deciduous molar, the magnitude of impaction index (MOII), and horizontal distance were measured on the panoramic radiographs. Chi-square tests and independent-sample t test were used for nominal and continuous variables, respectively. The receiver operative characteristic curve was used to determine the critical value. RESULTS: A total of 406 children with 634 first permanent molars, presenting EE, were enrolled, with 61.3% of the teeth in the SC group. Sex of children with EE and distribution of EE were not relevant to the IRR outcome. The presence of supernumerary teeth might be a protective factor for the IRR outcome. The increasing severity of root resorption in the second primary molar indicated an IRR outcome. A higher MOII and a larger EA suggested an IRR outcome with moderate-to-high quality. The horizontal distance exhibited debatable results, with a low predictive quality. CONCLUSION: Close monitoring and early intervention would benefit children with increasing severity of distal atypical resorption in the second primary molar, higher MOII, and larger EA.


Asunto(s)
Erupción Ectópica de Dientes , Niño , Preescolar , Arco Dental , Humanos , Diente Molar/diagnóstico por imagen , Radiografía Panorámica , Erupción Dental , Erupción Ectópica de Dientes/diagnóstico por imagen , Diente Primario
12.
Braz Oral Res ; 35: e022, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33605353

RESUMEN

This study aimed to determine the mean distances between apexes of the maxillary posterior teeth and the maxillary sinus, between apexes of the mandibular posterior teeth and the mandibular canal, and between the root apexes of all teeth and the adjacent cortical plates. A total of 800 cone-beam computed tomography (CBCT) scans (400 maxillary and 400 mandibular) were obtained from patients indicated for several treatments. The proximity between apexes and anatomical structures, and the relationship between apexes and adjacent cortical plates were assessed together with the risk of over-instrumentation. Paired-sample comparisons were performed by using the paired t-test. The means were compared by ANOVA, Kruskal-Wallis and Dwass-Steel-Critchlow-Fligner tests. a) Most of the apexes classified as A (high-risk proximity) were observed in maxillary first and second molars, in mandibular first and second molars, and in second premolars in relation to near anatomical structures. b) A predominance of class A (86.42%) was noticed in the first premolars, between apexes of maxillary teeth and adjacent cortical plates. c) The distance between apexes of mandibular teeth and buccal cortical plates showed a predominance of medium-risk proximity (B) in all the groups, except the first premolars, with the highest risk (82.22%), and the second molars, with low-risk proximity (C) to distal and mesiobuccal apexes (91.77% and 89.62%). CBCT images are important for endodontic diagnosis and treatment, since many teeth have high risk proximity to near anatomical structures and adjacent cortical plates.


Asunto(s)
Seno Maxilar , Raíz del Diente , Corteza Cerebral , Tomografía Computarizada de Haz Cónico , Humanos , Diente Molar/diagnóstico por imagen , Raíz del Diente/diagnóstico por imagen
13.
Head Face Med ; 17(1): 3, 2021 Feb 03.
Artículo en Inglés | MEDLINE | ID: mdl-33531044

RESUMEN

BACKGROUND: Orthodontic root resorptions are frequently investigated in small animals, and micro-computed tomography (µCT) enables volumetric comparison. Despite, due to overlapping histograms from dentine and bone, accurate quantification of root resorption is challenging. The present study aims at (i) validating a novel automated approach for tooth segmentation (ATS), (ii) to indicate that matching of contralateral teeth is eligible to assess orthodontic tooth movement (OTM) and root resorption (RR), (iii) and to apply the novel approach in an animal trial performing orthodontic tooth movement. METHODS: The oral apparatus of three female mice were scanned with a µCT. The first molars of each jaw and animal were segmented using ATS (test) and manually (control), and contralateral volumes were compared. Agreement in root volumes and time efficiency were assessed for method validation. In another n = 14 animals, the left first upper molar was protracted for 11 days at 0.5 N, whereas the contralateral molar served as control. Following ATS, OTM and RR were estimated. RESULTS: ATS was significantly more time efficient compared to the manual approach (81% faster, P < 0.01), accurate (volume differences: - 0.01 ± 0.04 mm3), and contralateral roots had comparable volumes. Protracted molars had significantly lower root volumes (P = 0.03), whereas the amount of OTM failed to reveal linear association with RR (P > 0.05). CONCLUSIONS: Within the limits of the study, it was demonstrated that the combination of ATS and registration of contralateral jaws enables measurements of OTS and associated RR in µCT scans.


Asunto(s)
Resorción Radicular , Animales , Femenino , Ratones , Diente Molar/diagnóstico por imagen , Roedores , Resorción Radicular/diagnóstico por imagen , Técnicas de Movimiento Dental , Raíz del Diente , Microtomografía por Rayos X
14.
Compend Contin Educ Dent ; 42(1): 38-42, 2021 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-33481625

RESUMEN

Implants used to replace molar teeth present issues of space distribution and crown contours that are unique to these sites. Because the diameter of the implant typically is smaller than that of the tooth being replaced, and the circular shape of the implant does not replicate the anatomy of the tooth, a large gingival embrasure area between the implant platform and adjacent tooth often results. Upon the review of radiographs of molar implants placed over an 11-year period in one private practice, the authors identified an unusually high incidence of approximal, cervical, and root caries on teeth adjacent to these implants. This retrospective radiographic study investigated the incidence of decay as related to: (1) the horizontal distance from the implant to the adjacent tooth (ie, the implant-tooth distance, or ITD) as measured at the alveolar crest, (2) the vertical distance from the apical portion of the prosthetic contact area to the implant platform, and (3) the presence of an existing restoration on the adjacent tooth. Of the three variables examined, both the horizontal distance of the implant to a natural tooth (ITD) and the presence of an existing restoration on an adjacent tooth proved to be significantly correlated with the incidence of decay. Results showed that incidence of decay ranges from 7.4% when the ITD is less than 2 mm to 40% when the ITD is ≥6 mm. The mean ITD in cases in which decay was found was 4.1 mm, and it was 3.5 mm in cases that showed no decay (P = .005). It is therefore suggested that the horizontal threshold of 4 mm be considered as the "critical ITD." The results also indicated that the presence of a previous restoration on an adjacent tooth increases the incidence of decay to a statistically significant degree with an odds ratio of 2.25 at a 95% confidence level. This information may prove useful in diagnosis and treatment planning for molar implant replacement.


Asunto(s)
Implantes Dentales de Diente Único , Implantes Dentales , Incidencia , Diente Molar/diagnóstico por imagen , Diente Molar/cirugía , Estudios Retrospectivos
15.
J Endod ; 47(4): 585-591, 2021 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-33497731

RESUMEN

INTRODUCTION: The aim of this study was to evaluate if the configuration of canal orifices can predict the presence of a second mesiobuccal canal (MB2) in maxillary second molars with fused roots. METHODS: Maxillary second molars with fused roots (N = 150) were scanned in a micro-computed tomographic device (pixel size = 9 µm) and evaluated regarding the root fusion type and the incidence of the MB2 canal. The centers of the canal orifices were connected, and the angles formed by the intersection of these lines as well as their distances were measured and statistically compared (1-way analysis of variance). Specimens were then assigned to 2 groups according to the presence (n = 65) or absence (n = 50) of the MB2 canal and compared regarding the angles and interorifice distances using the Welch t test. A binary logistic regression model estimated the association between the interorifice distance, the fusion type, and the presence of the MB2 canal, whereas receiver operating characteristic curve analysis was performed to evaluate the diagnostic abilities of significant variables. The significance level was set at 5%. RESULTS: The most common fusion types were 1 and 6, and MB2 canal incidence was 47.3%. No statistical difference was observed in the angles or interorifice distances among teeth with different fusion types (P > .05). Distances from the mesiobuccal (MB) to the distobuccal and palatal (P) canal orifices as well as the MB and P angles were significantly higher in the presence of an MB2 canal (P < .05). A binary logistic regression model revealed that MB-distobuccal and MB-P distances were significant in the presence of an MB2 canal (P < .05). Receiver operating characteristic analysis indicated that MB-P distance had acceptable diagnostic accuracy for the prediction of MB2 canal presence. Sensitivity (specificity) calculated from the MB-P distances of 4.0, 4.5, and 5.0 mm were 89.2% (36.5%), 76.9% (58.4%), and 44.4% (71.4%), respectively. CONCLUSIONS: MB-P interorifice distance is a strong predictor of the presence of the MB2 canal in maxillary second molars with fused roots.


Asunto(s)
Tomografía Computarizada de Haz Cónico , Raíz del Diente , Cavidad Pulpar/diagnóstico por imagen , Humanos , Maxilar/diagnóstico por imagen , Diente Molar/diagnóstico por imagen , Raíz del Diente/diagnóstico por imagen
16.
Am J Orthod Dentofacial Orthop ; 159(2): 184-192, 2021 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-33388202

RESUMEN

INTRODUCTION: This study aimed to evaluate the 3-dimensional (3D) mandibular dental changes over 42 years using the registration of digital models. METHODS: The sample comprised digital dental models of 8 untreated subjects (4 males and 4 females) with normal occlusion measured longitudinally at ages 17 years (T1) and 60 years (T2). Using 13 landmarks placed on the mucogingival junction, we registered the T2 model on the T1 model. Three-dimensional changes in the position of the landmarks on the buccal cusp tip of the posterior teeth and incisal edge of the central incisors were measured by 2 examiners. Registration and measurements were performed using SlicerCMF (version 3.1; http://www.slicer.org) software. Intra- and interrater agreements were evaluated using intraclass correlation coefficients and the Bland-Altman method. One-sample t tests were used for evaluating interphase 3D dental changes (P <0.05). RESULTS: Adequate intra- and interrater reproducibility was found. From T1 to T2, the mandibular teeth showed significant 3D positional changes. A significant dental eruption relative to the mucogingival junction was observed for the anterior and posterior teeth. Anteroposterior movements of mandibular teeth were not significant except for the right molar that drifted mesially. Transverse movements included slight lingual tipping at canines and premolars regions. CONCLUSIONS: Dental changes in untreated normal occlusion were very slight from early to mature adulthood. The eruption of the mandibular teeth was the most consistent finding. A tendency for mesial movement of molars and lingual movement of first premolars and canines was observed in the mandible during the aging process.


Asunto(s)
Mandíbula , Diente Molar , Adolescente , Adulto , Envejecimiento , Diente Premolar , Femenino , Humanos , Masculino , Mandíbula/diagnóstico por imagen , Diente Molar/diagnóstico por imagen , Reproducibilidad de los Resultados
17.
Quintessence Int ; 0(0): 0, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33491388

RESUMEN

Objectives: This systematic review aimed to evaluate the clinical and radiographic outcomes of coronal and partial pulpotomies in mature permanent molars with cariously exposed vital pulp. Method and materials: The protocol of the current review was registered in the PROSPERO database (CRD 42020190785). Articles published between January 1980 and June 2020 were searched in eight different online databases and six textbooks according to PRISMA guidelines. Eleven studies were included in the analysis of 1-year success rates, whereas five studies were included in the analyses of 2-year and > 2-year success rates for coronal pulpotomy. Two studies were included in the analyses of the 1-year and 2-year success rates for partial pulpotomy. The clinical and radiographic success rates were estimated using the DerSimonian-Laird random effect method. The risks of bias were evaluated using Cochrane RoB 2, ROBINS-I, and Newcastle-Ottawa scale assessment tools. Evidence levels were determined using the Oxford Centre for Evidence-Based Medicine (OCEBM) recommendation tool. The success rates using different pulp capping medicaments and restorative materials were analyzed using meta-regression analysis. Results: The clinical and radiographic success rates of coronal pulpotomy ranged between 92.2% and 99.4%, whilst for partial pulpotomy, the success rates ranged between 78.2% and 80.6%. Different pulp capping medicaments and restorative materials showed no significant effect on the success rates of coronal pulpotomy, but the former significantly (P < .05) affected the success rates of partial pulpotomy. Conclusion: Coronal and partial pulpotomies demonstrated a high success rate in treating cariously exposed vital pulp of mature permanent molars. Further well-designed studies with longer follow-up periods are required to validate these findings.


Asunto(s)
Caries Dental , Pulpotomía , Materiales Dentales , Recubrimiento de la Pulpa Dental , Humanos , Diente Molar/diagnóstico por imagen , Diente Molar/cirugía , Diente Primario , Resultado del Tratamiento
18.
Am J Orthod Dentofacial Orthop ; 159(3): 271-280, 2021 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-33485718

RESUMEN

INTRODUCTION: This study was aimed at investigating the reliability and accuracy of cone-beam computed tomography (CBCT) diagnosis of contact between a temporary anchorage device (TAD) and tooth root and assessing any effect produced by metal brackets, imaging software program, and image segmentation or color enhancement tools. METHODS: Eighteen fresh pig mandibles were used. TADs (Vector, 1.4 × 8 mm) were placed at the buccal intermolar alveolar bone on both sides of the mandibles. With soft tissue kept intact, each mandible underwent CBCT scans (voxel size, 400 µm) before and after placing TADs, and after placing metal brackets on involved molars. Alveolar bone specimens containing the TADs were then exposed to microcomputed tomography (microCT) scans (voxel size, 27 µm) after TAD removal. Two independent raters, blinded of image identity, diagnosed TAD-root contact using ImageJ (National Institutes of Health and the Laboratory for Optical and Computational Instrumentation, University of Wisconsin, Madison, Wis) for microCT; Dolphin (Dolphin Imaging and Management Solutions, Chatsworth, Calif) and Anatomage software programs (Anatomage, Santa Clara, Calif) for CBCT images. Intrarater and interrater reliability and diagnostic accuracy were statistically assessed using Cohen kappa and McNemar tests. RESULTS: Intrarater and interrater reliability of TAD-root contact diagnoses were perfect for microCT diagnoses (κ = 1), generally moderate to good (κ >0.5) for CBCT diagnoses except for the use of color enhancement tools (κ <0.25). For diagnostic accuracy, there was generally a low agreement (κ <0.45) between CBCT and microCT (gold standard). The percent accuracy ranged from 68.1% to 79.2% and was not different among raters, bracket presence/absence, or software choices (chi-square tests, P >0.05). Overall, diagnostic sensitivity was above 80%, whereas specificity was below 55%. CONCLUSIONS: Despite good reliability, diagnoses of TAD-root contact using 400 µm voxel size CBCT imaging tend to be inaccurate, with a likelihood of high false-positive diagnoses.


Asunto(s)
Tomografía Computarizada de Haz Cónico , Diente Molar , Animales , Diente Molar/diagnóstico por imagen , Reproducibilidad de los Resultados , Porcinos , Raíz del Diente/diagnóstico por imagen , Microtomografía por Rayos X
19.
J Oral Maxillofac Surg ; 79(4): 756-762, 2021 04.
Artículo en Inglés | MEDLINE | ID: mdl-33359105

RESUMEN

PURPOSE: This retrospective study examined distal bone healing on the adjacent second molar between the demineralized bone matrix incorporated with recombinant human bone morphogenetic protein-2 (DBM/rhBMP-2) and a collagen sponge in the mandibular third molar extraction socket. MATERIALS AND METHODS: From 2018 to 2020, 26 extraction patients (male, average 21.5 years), who received a graft (each of 13 using DBM/rhBMP-2 and collagen plug, respectively) on the extraction socket without primary closure, were enrolled in this study. The bony defect was measured by computed tomography before and 6 months after the extraction. The difference in the bone healing was analyzed between the DBM/rhBMP-2 and collagen plug groups using a Mann-Whitney U test. RESULTS: No complications, such as infection and food packing, were encountered. The DBM/rhBMP-2 and collagen plug groups showed a similar distribution of preoperative bony defect (median 5.8 and 5.0 mm, respectively). After 6 months, more bone healing was observed in the DBM/rhBMP-2 group than in the collagen plug group (median 3.85 and 2.37 mm, respectively, P = .029) CONCLUSIONS: A DBM/rhBMP-2 graft after a third molar extraction does significantly alter the bony defect on the distal aspect of the second molar compared with a collagen plug.


Asunto(s)
Mandíbula , Tercer Molar , Proteína Morfogenética Ósea 2/uso terapéutico , Humanos , Masculino , Mandíbula/cirugía , Diente Molar/diagnóstico por imagen , Diente Molar/cirugía , Tercer Molar/diagnóstico por imagen , Tercer Molar/cirugía , Proteínas Recombinantes , Estudios Retrospectivos , Extracción Dental , Factor de Crecimiento Transformador beta
20.
Aust Endod J ; 47(1): 81-89, 2021 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-33368843

RESUMEN

This study aimed to evaluate the influence of large apical preparations with Reciproc (REC), Hyflex CM (HCM) and Twisted File Adaptive (TFA) systems using micro-computed tomography (MCT). Ninety mesiobuccal (MB) and distobuccal (DB) root canals of maxillary molars (n = 45) were scanned using MCT before and after the shaping procedures. The root canals (n = 15) were prepared until REC 40.06, HCM 40.04 and TFA 35.04. The root canal transportation (RCT), centring ability (CA), change in volume of the root canal and at different levels (VC), remaining dentine thickness (RDT), removal of dentine wall (RDW) and working time (WT) were evaluated. Data were analysed using the Kruskal-Wallis and Dunn tests, and the one-way ANOVA and Tukey tests with a level of significance set at 5%. No significant difference among the instruments was found regarding the RCT, CA, RDT, RDW and WT (P > 0.05), in larger apical preparations in curved MB and straight DB canals of maxillary molars.


Asunto(s)
Cavidad Pulpar , Preparación del Conducto Radicular , Cavidad Pulpar/diagnóstico por imagen , Diseño de Equipo , Diente Molar/diagnóstico por imagen , Microtomografía por Rayos X
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