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1.
Niger J Clin Pract ; 24(6): 919-924, 2021 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-34121742

RESUMO

Background: Although the demand for esthetic filling of primary teeth with resin composite is increasing, there is no enough data on the adhesive performance of composite restorations in primary teeth. Despite the improvements in resin composites, interfacial gap is still a disadvantage as it may cause marginal staining, secondary caries, and restoration failure. Previous studies have validated the efficiency of optical coherence tomography (OCT) in the evaluation of adhesive interface in permanent teeth, but not in primary teeth. Aims: The aim of this study was to assess microleakage upon composite restorations in primary teeth using cross-polarization OCT (CP-OCT). Methodology: Cylindrical class-V cavities were prepared in extracted human primary second molars and divided into four groups randomly. In groups 1 and 2, cavities were restored using Tetric N-Universal adhesive in the self-etch mode followed by IPS Impress Direct Composite and Ceram.x One Universal composite, respectively. In groups 3 and 4, one-step self-etch Prime and Bond Elect adhesive was used followed by ID composite and CX composite in groups 3 and 4, respectively. The specimens were then immersed in a contrasting solution followed by interfacial microleakage examination under CP-OCT. The recorded images were analyzed to quantify the mean gap percentages. Results: All tested groups showed variable degree of interfacial microleakage under composite restorations. Two-way ANOVA showed the composite factor was significantly influencing the results, unlike the adhesive. Group 1 and 2 had the lowest and highest mean gap percentage, respectively, which were significantly different from the other groups. Groups 3 and 4 were not significantly different. Conclusion: Based on the current finding, a polymeric restorative system from the same manufacturer reduces the risk of interfacial microleakage in primary teeth.


Assuntos
Resinas Compostas , Tomografia de Coerência Óptica , Restauração Dentária Permanente , Humanos , Dente Molar/diagnóstico por imagem , Cimentos de Resina , Dente Decíduo
2.
Braz Oral Res ; 35: e064, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34076189

RESUMO

Sixty moderately curved canals of mandibular molars classified as Vertucci's type IV canal configuration were selected by micro-CT 1174. The teeth were divided into two groups according to the kinematics used, whether reciprocating or rotary motion (n=30, totaling 60 mesial root canals). The instruments used to perform the glide path procedures had identical features (0.15 mm of tip size, 0.04 mm/mm taper, thermal treatment, and square cross-section), but differed in the direction of the cutting blade. The duration of the procedure and the absolute and percentage frequency of the instruments to reach the full working length were recorded. The torsional test (3630-1; 1992) was performed on both used and unused instruments, to evaluate a possible reduction in the torsional resistance when using the glide path procedure. Statistical analysis was performed using the unpaired t-test and the chi-square test, and the level of significance was set at 5%. The type of kinematics used affected the duration of glide path procedures, and the reciprocating motion seemed to induce less torsional stress during glide path procedures.


Assuntos
Cavidade Pulpar , Preparo de Canal Radicular , Fenômenos Biomecânicos , Desenho de Equipamento , Dente Molar/diagnóstico por imagem , Microtomografia por Raio-X
3.
Shanghai Kou Qiang Yi Xue ; 30(2): 135-139, 2021 Apr.
Artigo em Chinês | MEDLINE | ID: mdl-34109350

RESUMO

PURPOSE: To compare the accuracy of implant placement between modified and traditional immediate implant placement in mandibular molar regions. METHODS: Twenty-four patients were selected for immediate implantation in the molar area including 24 implantation sites. Preoperative cone-beam CT(CBCT) was conducted and then digital software Simplant 18.0 was used to design the ideal three-dimensional position of the implants. In the experimental group, the implant socket was prepared first according to reference of the remaining natural teeth, then the implant was implanted after minimally invasive extraction. Twelve patients in the control group underwent immediate implantation by traditional immediate implant procedures. Minimally invasive extraction, then socket preparation, and final implanting were performed. All patients underwent CBCT after surgery. Implant sites designed prior to surgery and actual implant sites differences between modified and traditional immediate implant placement were measured by Simplant 18.0 and compared with SPSS 17.0 software package. RESULTS: In the experimental group and control group, the measured average deviation were as follows, the angle was (4.492±0.912)° and (7.255±1.307)°, respectively; The horizontal error of the implant shoulder was (0.379±0.083) mm and (1.229±0.270) mm, respectively; The measuring horizontal error of the implant apex was (1.263±0.267) mm and (2.183±0.264) mm, respectively; The calculative horizontal error of the implant apex was (1.324±0.203) mm and (2.709±0.383) mm, respectively; Depth error of the implant apex was (0.663±0.123) mm and (1.533±0.155) mm, respectively, which were significantly lower than those of the control group. CONCLUSIONS: Compared with the traditional method, modified immediate implantation can improve the accuracy of implantation in mandibular molars.


Assuntos
Implantes Dentários , Boca Edêntula , Cirurgia Assistida por Computador , Tomografia Computadorizada de Feixe Cônico , Implantação Dentária Endo-Óssea , Humanos , Dente Molar/diagnóstico por imagem
4.
Arch Oral Biol ; 128: 105172, 2021 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-34058725

RESUMO

OBJECTIVE: The position and size of the major cusps in mammalian molars are arranged in a characteristic pattern that depends on taxonomy. In humans, the cusp which locates distally within each molar is smaller than the mesially located cusp, which is referred to as "distal reduction". Although this concept has been well-recognized, it is still unclear how this reduction occurs. Current study examined whether senescence-accelerating mouse prone 8 (SAMP8) mice could be a possible animal model for studying how the mammalian molar cusp size is determined. DESIGN: SAMP8 mice were compared with parental control (SAMR1) mice. Microcomputed tomography images of young and aged mice were captured to observe molar cusp morphologies. Cusp height from cement-enamel junction and mesio-distal length of molars were measured. The statistical comparison of the measurements was performed by Mann-Whitney U test. RESULTS: SAMP8 mice showed reduced development of the disto-lingual cusp (entoconid) of lower second molar when compared with SAMR1 mice. The enamel thickness and structure was disturbed at entoconid, and aged SAMP8 mice displayed severe wear of the entoconid in lower second molar. These phenotypes were observed on both sides of the lower second molar. CONCLUSIONS: In addition to the general senescence phenotype observed in SAMP8 mice, this strain may genetically possess molar cusp phenotypes which is determined prenatally. Further, SAMP8 mice would be a potential model strain to study the genetic causes of the distal reduction of molar cusp size.


Assuntos
Dente Molar , Dente , Animais , Cemento Dentário , Modelos Animais de Doenças , Camundongos , Dente Molar/diagnóstico por imagem , Microtomografia por Raio-X
5.
BMC Oral Health ; 21(1): 252, 2021 05 12.
Artigo em Inglês | MEDLINE | ID: mdl-33980213

RESUMO

PURPOSE: To assess the clinical and radiographic success rate of microsurgical endodontic treatment of upper molar teeth in relationship with the maxillary sinus, with 12 months follow-up. METHODS: Patients treated with microsurgical endodontic treatment of upper molar teeth in the period between 2017 and 2019 were recruited from two dental clinics according to specific selection criteria. The outcomes were determined based on clinical and radiographic results taken three, six and 12 months post-operatively, compared with those taken immediately before and after surgery. Clinical and radiographic outcomes were recorded. The distance between the most apical part of the root and of the lesion to the maxillary sinus was measured on CBCT images before the surgery. Patient-related outcomes were recorded. RESULTS: Out of 35 patients evaluated, 21 were selected according with the selection criteria for a total of 27 roots and 29 canals treated. After 12 months, 18 patients showed a complete healing whereas three demonstrated incomplete healing. Consequently, the success rate in this study was 85.7% after one year. In 28.5% (6 patients) there was a perforation of the Schneiderian membrane that didn't seem to affect the outcome. All patients kept the molar one year later. The pain level decreased significantly over the time during the first week after surgery. CONCLUSION: Microsurgical Endodontic treatment of the upper molar teeth should be considered a valid and predictable treatment option even in case of Schneiderian membrane perforation. Future clinical studies with a larger sample size are needed to compare the results obtained.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Seio Maxilar , Humanos , Maxila/cirurgia , Seio Maxilar/diagnóstico por imagem , Seio Maxilar/cirurgia , Dente Molar/diagnóstico por imagem , Dente Molar/cirurgia , Mucosa Nasal , Estudos Retrospectivos , Raiz Dentária
6.
J Clin Pediatr Dent ; 45(2): 129-134, 2021 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-33951167

RESUMO

The aim of this manuscript analyses the efficacy of Transpalatal Arch (TPA) and Nance Button (NB) in maintaining space after the premature loss of upper primary molars. STUDY DESIGN: 54 subjects who needed space maintenance in the upper arch (23 in the TPA group and 31 in the NB group) and had radiographic follow-up until the appliance removal were enrolled in the study. The space loss was obtained from measurements carried out in initial and final radiographs. Type of dental loss and changes in molar relationship were also recorded. RESULTS: The mean of space loss in the TPA group was 1.336mm, while in the NB group was 0.695mm, with no statistically significant differences between the total space loss neither the type of dental loss within the NB or TPA group (p >0.05). CONCLUSIONS: The loss of space in the unilateral second primary molar is higher in the TPA group than in the NB group, with significant statistically differences (p<0.05). It is concluded that the loss of the leeway space using a TPA as a space maintainer is greater than using a NB.


Assuntos
Dente Molar , Mantenedor de Espaço em Ortodontia , Arco Dental/diagnóstico por imagem , Humanos , Dente Molar/diagnóstico por imagem , Desenho de Aparelho Ortodôntico , Dente Decíduo
7.
J Clin Pediatr Dent ; 45(2): 98-103, 2021 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-33951172

RESUMO

OBJECTIVES: To determine different combinations of marginal ridge shape (MRS) and contact extents in nature of the contact between primary molars and its correlation with the presence of carious lesions on radiographic examination of approximal surfaces. STUDY DESIGN: Retrospective study of 347 clinical records, including photographs and bitewing radiographs, were assessed for intact MRS and caries extent. The carious lesions were scored (0-5, Mejàre scoring system) radiographically and correlated to the intact MRS on clinical photographs, and strength of associations quantified using logistic regression analysis and chi-square tests. RESULTS: Primary molars, 848(contact extent), and 757(MRS) were analyzed. Combination of straight-convex(35.4%) MRS was more common (p<0.001). None of the approximal surfaces were caries-free for straight and straight MRS with 36.4% of both approximal surfaces exhibiting caries in enamel, and 38.2% of one approximal surface exhibiting caries in dentin. Approximately 90% of the primary molars with substantial contacts exhibited carious lesions in the enamel and 80% with light contacts exhibited carious lesions in the dentin (p<0.001). CONCLUSION: Six different combinations of intact MRS were identified. Combination of concave-convex shapes exhibited caries extending into dentin. Substantial and/or light contacts between primary molars showed higher caries experience in the approximal surfaces.


Assuntos
Suscetibilidade à Cárie Dentária , Cárie Dentária , Cárie Dentária/diagnóstico por imagem , Dentina , Humanos , Dente Molar/diagnóstico por imagem , Radiografia Interproximal , Estudos Retrospectivos
9.
J Vis Exp ; (170)2021 04 15.
Artigo em Inglês | MEDLINE | ID: mdl-33938887

RESUMO

Orthodontic tooth movement is a complex biological process of altered soft and hard tissue remodeling as a result of external forces. In order to understand these complex remodeling processes, it is critical to study the tooth and periodontal tissues within their 3D context and therefore minimize any sectioning and tissue artefacts. Mouse models are often utilized in developmental and structural biology, as well as in biomechanics due to their small size, high metabolic rate, genetics and ease of handling. In principle this also makes them excellent models for dental related studies. However, a major impediment is their small tooth size, the molars in particular. This paper is aimed at providing a step by step protocol for generating orthodontic tooth movement and two methods for 3D imaging of the periodontal ligament fibrous component of a mouse mandibular molar. The first method presented is based on a micro-CT setup enabling phase enhancement imaging of fresh collagen tissues. The second method is a bone clearing method using ethyl cinnamate that enables imaging through the bone without sectioning and preserves endogenous fluorescence. Combining this clearing method with reporter mice like Flk1-Cre;TdTomato provided a first of its kind opportunity to image the 3D vasculature in the PDL and alveolar bone.


Assuntos
Imageamento Tridimensional/métodos , Mandíbula/diagnóstico por imagem , Dente Molar/diagnóstico por imagem , Ligamento Periodontal/diagnóstico por imagem , Técnicas de Movimentação Dentária , Animais , Fenômenos Biomecânicos , Cinamatos , Modelos Animais de Doenças , Camundongos , Microtomografia por Raio-X/métodos
10.
Artigo em Inglês | MEDLINE | ID: mdl-33819322

RESUMO

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.


Assuntos
Aumento do Rebordo Alveolar , Tomografia Computadorizada de Feixe Cônico Espiral , Aloenxertos , Processo Alveolar/diagnóstico por imagem , Processo Alveolar/cirurgia , Transplante Ósseo , Humanos , Dente Molar/diagnóstico por imagem , Dente Molar/cirurgia , Projetos Piloto , Politetrafluoretileno , Solventes , Extração Dentária , Alvéolo Dental/cirurgia
11.
Artigo em Inglês | MEDLINE | ID: mdl-33819330

RESUMO

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.


Assuntos
Implantes Dentários para Um Único Dente , Implantes Dentários , Dente Suporte , Implantação Dentária Endo-Óssea , Humanos , Dente Molar/diagnóstico por imagem , Dente Molar/cirurgia , Estudos Prospectivos , Alvéolo Dental/cirurgia
12.
BMC Oral Health ; 21(1): 184, 2021 04 12.
Artigo em Inglês | MEDLINE | ID: mdl-33845803

RESUMO

BACKGROUND: Information regarding the reaction of bone augmentation in terms to sinus mucosa thickness of periodontally compromised molar extraction sites is limited. This retrospective study aimed to analyze the effect of ridge preservation procedures following the extraction of molars with severe periodontitis on the healing pattern of adjacent maxillary sinus mucosal membranes. METHODS: Thirty-one periodontally compromised maxillary molar teeth either receiving ridge preservation (test group, n = 20) or undergoing spontaneous healing (control group, n = 11) were investigated. Cone-beam computed tomography (CBCT) scanning was performed before the extraction procedure and repeated 6 months later. The mucosa thickness (MT) of the adjacent periodontally compromised molar tooth was measured from CBCT images before tooth extraction and after 6 months of healing at nine assigned measurement points. The data were analyzed at α = 0.05. RESULTS: The prevalence of pre-extraction maxillary sinus mucosal thickening was 60.0% and 63.6% in the test and control groups, respectively. The average MT of the thickened sinus mucosa before tooth extraction was 3.78 ± 2.36 mm in the test group and 4.63 ± 3.20 mm in the control group (P = 0.063). The mean mucosal thickening reductions in the thickened MT subjects after 6 months of healing were 2.20 ± 2.05 mm (test group) and 2.64 ± 2.70 mm (control group), P = 0.289. The differences of MT between the time prior to extraction and after 6 months of healing were statistically significant within both groups (P < 0.05). CONCLUSIONS: Following extraction of molars with severe periodontitis, a reduction in swelling of the Schneiderian membrane has been observed regardless of the addition of a DBBM socket graft. However, a mucosal thickness > 2 mm was still frequently observed.


Assuntos
Perda do Osso Alveolar , Periodontite , Tomografia Computadorizada de Feixe Cônico , Humanos , Dente Molar/diagnóstico por imagem , Dente Molar/cirurgia , Mucosa Nasal/diagnóstico por imagem , Periodontite/diagnóstico por imagem , Projetos Piloto , Estudos Retrospectivos , Extração Dentária
13.
J Indian Soc Pedod Prev Dent ; 39(1): 79-84, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33885392

RESUMO

Objective: Metapex/Vitapex is one of the most commonly used obturating materials in pediatric dental practice in recent times. It is available in a premixed syringe which poses numerous practical difficulties. This study aimed to calculate the root canal volume of maxillary and mandibular canine and second molar using cone-beam computed tomography (CBCT) to determine the quantity/grams of obturation material to obturate a single tooth (mass = density × volume). Materials and Method: This nonrandomized clinical trial is comprised of two parts. The first part involved calculation of average root canal volume using CBCT which was used to calculate the quantity/grams of obturating material. This predetermined quantity was used to obturate primary mandibular second molars and canines, and the quality of obturation was assessed. Results: Assessment of quality of obturation showed optimum length obturation in 53.33% primary second molars and 66.66% primary canines. Conclusion: It can be inferred that even with the use of exact predetermined quantity/grams of obturating material, optimum quality obturation could be achieved, thus avoiding wastage, preventing cross contamination, and simultaneously offering good clinical results. Hence, this study opens further gateways to device ampules containing predetermined mass of obturating material for a single use for obturation of a single primary tooth.


Assuntos
Cavidade Pulpar , Dente Molar , Criança , Tomografia Computadorizada de Feixe Cônico , Cavidade Pulpar/diagnóstico por imagem , Humanos , Dente Molar/diagnóstico por imagem , Raiz Dentária , Dente Decíduo
14.
Gen Dent ; 69(3): 61-67, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33908881

RESUMO

The success of root canal treatment depends on complete debridement of pulp tissue from the root canals. Therefore, a thorough knowledge of unusual anatomical findings is of utmost importance. Although the majority of mandibular molars present with 2 roots (mesial and distal) and 3 or 4 root canals, the number of roots and root canals in individual molars may vary. An extra root is called a radix entomolaris if it is located distolingually and a radix paramolaris if located mesiobuccally. This article presents a series of 5 cases of radix entomolaris and radix paramolaris in mandibular first, second, and third molars and reviews the literature on these morphologic variations.


Assuntos
Dente Molar , Raiz Dentária , Cavidade Pulpar , Humanos , Mandíbula/diagnóstico por imagem , Dente Molar/diagnóstico por imagem , Tratamento do Canal Radicular , Raiz Dentária/diagnóstico por imagem
15.
Braz Oral Res ; 35: e060, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33909867

RESUMO

This study aimed to describe the morphometric relationship of root canal orifices on the pulp floor in the presence/absence of mesiobuccal second canal (MB2) in the maxillary first molars and other aspects of its internal anatomy. Sixty-two maxillary first molars were scanned by micro-CT. The presence of the MB2 canal was verified. The distance between the center points of the MB1, MB2, distobuccal (DB), and palatal (P) canal orifices on the pulp floor were measured (MB1-MB2, MB1-DB, MB2-DB, MB1-P, and DB-P). The MB1-P to DB-P ratio was calculated. The distances between the anatomic apex and the MB1 and MB2 apical foramina were measured. The length of the band-shaped isthmus was also measured. Student's t-test was applied to verify the association between the presence of an MB2 canal, the interorifice distances, and the ratio of the MB1-P to DB-P distance (α = 5%). The MB2 canal was present in 43 roots (69.35%). Statistics showed significant differences when MB2 was present for the largest MB1-P distance (p < 0.05) and higher values for the MB1-P to DB-P ratio (p < 0.05). A band-shaped isthmus was detected in 25.8% of MB roots. The mean distance from the apical foramen to the isthmus floor ranged from 1.74 for MB1 canals to 1.42 for MB2 canals. Canal orifice distances on the pulp floor may predict the presence of MB2 canals. There was a high incidence of isthmus, accessory canals, and apical delta in the critical apical zone in MB roots of maxillary first molars.


Assuntos
Maxila , Raiz Dentária , Cavidade Pulpar/diagnóstico por imagem , Humanos , Maxila/diagnóstico por imagem , Dente Molar/diagnóstico por imagem , Raiz Dentária/diagnóstico por imagem , Microtomografia por Raio-X
16.
Niger J Clin Pract ; 24(4): 584-594, 2021 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-33851682

RESUMO

Background: Dental caries is a multifactorial disease that causes reversible decalcification and cavitation of susceptible teeth exposed to sugary substrates over a period of time in the oral cavity. It gives clinical and social burdens to the child patients and their parents/carers. Stainless steel crown (SSC) restoration is one of the restorative treatment options in the management of carious primary molars. Aims: The Hall technique is a biologic method of managing primary teeth by sealing in the caries with preformed metal crowns (SSCs). The objectives of this study were to assess and compare the primary and secondary treatment outcomes of stainless steel crown restorations using the conventional method and the Hall technique in primary molars immediately after placement and over a 12-month period using both clinical and radiological parameters. Methods: The study was a randomized control clinical trial using a split mouth approach. A total of 25 stainless steel crown restorations using the conventional method and 25 stainless steel crown restorations using the Hall technique were placed in 25 subjects aged 3-8 years with a pair or pairs of unrestored enamel or dentinal carious primary molars matched for tooth type, dental arch, and extent of caries. All subjects were monitored and reviewed every 3 months for 12 months. Results: Twenty three subjects returned for follow-up. There was no statistically significant difference (P-value > 0.05) between the conventional SSC restoration and the Hall technique for both the primary outcomes/major failures (irreversible pulpitis, dental abscess, peri-radicular radiolucency, and crown loss with tooth unrestorable) and secondary outcomes/minor failures (crown loss and tooth restorable, crown perforation, secondary/marginal caries, and reversible pulpitis). But, there was a statistical significant difference in the average time taken for the placement of the restorations between the two groups (P-value 0.001). Conclusion: Both the conventional SSC restorations and the Hall technique can be provided for all the subjects in this study. The Hall Technique compared favorably well with the conventional SSC restoration in clinical and radiological outcomes. The Hall Technique appears to offer an effective treatment option for managing dental caries in primary molar teeth especially in a resource challenged environment where electricity and treatment under general aaesthesia can sometimes be a problem.


Assuntos
Cárie Dentária , Aço Inoxidável , Criança , Pré-Escolar , Coroas , Cárie Dentária/terapia , Falha de Restauração Dentária , Restauração Dentária Permanente , Humanos , Dente Molar/diagnóstico por imagem , Dente Decíduo , Resultado do Tratamento
17.
Quintessence Int ; 52(7): 584-595, 2021 Jun 09.
Artigo em Inglês | MEDLINE | ID: mdl-33880907

RESUMO

OBJECTIVES: The retrospective study was undertaken to assess the peri-implant tissue stability in premolar and molar sites clinically and radiographically for implants 7 years after loading. METHOD AND MATERIALS: 408 implants placed in 275 patients from 2012 to 2020 and following a regular recall protocol were assessed for Modified Plaque Index (MPI), Sulcus Bleeding Index (SBI), pocket probing depth (PPD), and the peri-implant soft tissue dehiscence (PSTD) clinically and mesial bone loss (MBL) and distal bone loss (DBL) radiographically. RESULTS: Significant differences were found in MPI, SBI, and PPD amongst both men and women in the premolar and molar regions. The mean MBL and DBL were substantially greater in women than in men and marginally more in the maxilla than in the mandible. Maximum mean bone loss on either aspect of the premolar and molar implants was 2.80 ± 1.54 mm and 2.97 ± 0.96 mm for women. Implant success of 96.82% at 7 years was achieved and the patient satisfaction levels of 94.55% and 95.50% in the mandibular and maxillary arches, respectively, implied that patients were satisfied with the treatment. CONCLUSION: Women exhibited greater marginal bone loss on the mesial and distal aspects than men, with premolar implant sites demonstrating greater propensity for marginal bone loss than molar implant sites.


Assuntos
Perda do Osso Alveolar , Implantes Dentários , Perda do Osso Alveolar/diagnóstico por imagem , Dente Pré-Molar/diagnóstico por imagem , Prótese Dentária Fixada por Implante , Feminino , Seguimentos , Humanos , Masculino , Mandíbula/diagnóstico por imagem , Dente Molar/diagnóstico por imagem , Dente Molar/cirurgia , Estudos Retrospectivos , Resultado do Tratamento
18.
J Endod ; 47(6): 932-938, 2021 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-33774046

RESUMO

INTRODUCTION: This study compared the residual tooth strength and stress distribution of a mandibular molar prepared with different variable tapered file systems using finite element analysis (FEA). METHODS: Two preaccessed mandibular molar TruTeeth (Endo 3DP; Acadental, Lenexa, KS) were subjected to simulated endodontic treatment in this study. One tooth was instrumented with ProTaper Gold (Dentsply Tulsa Dental Specialties, Tulsa, OK), and the other was instrumented with V-Taper 2H (SS White Dental, Lakewood, NJ). The 2 teeth were scanned using micro-computed tomographic imaging, and stereolithographic surface meshes were developed for FEA. Each model was subjected to a 200-N multipoint load-simulating mastication. The results of the FEA provided quantitative and qualitative measurements for von Mises stress distribution and total deformation. RESULTS: The maximum von Mises stress was greater in the ProTaper Gold-prepared model than the V-Taper 2H prepared model. In both models, total deformation values were highest in the clinical crown on the buccal aspect of the tooth. The highest stress values were found in the pericervical dentin, and stress decreased apically through the root. CONCLUSIONS: Within the limitations of this study, it can be concluded that the maximum stress values within the tooth prepared by ProTaper Gold were higher than those in the tooth prepared by V-Taper 2H. Canal preparation with the V-Taper 2H system preserves more pericervical dentin, which may increase the resistance to fracture.


Assuntos
Dente Molar , Preparo de Canal Radicular , Cavidade Pulpar/diagnóstico por imagem , Análise de Elementos Finitos , Dente Molar/diagnóstico por imagem , Estresse Mecânico
19.
Am J Orthod Dentofacial Orthop ; 159(6): e473-e481, 2021 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-33771431

RESUMO

Rarely is the extraction of the four first molars the ideal choice in the course of orthodontic treatment, particularly in older patients. Although this approach can offer distinct advantages in carefully selected patients, it is also associated with a number of well-recognized problems, including the extension of treatment times, anchorage management, and control of second molars during space closure. However, by careful use of contemporary materials and techniques, a high standard of treatment can be achieved, even in patients with complex malocclusions. This is illustrated in a report of a case that highlights both the challenges and some of the solutions this treatment modality can offer.


Assuntos
Má Oclusão , Procedimentos de Ancoragem Ortodôntica , Idoso , Humanos , Dente Molar/diagnóstico por imagem , Fechamento de Espaço Ortodôntico , Técnicas de Movimentação Dentária
20.
J Clin Pediatr Dent ; 45(1): 22-28, 2021 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-33690822

RESUMO

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.


Assuntos
Compostos de Cálcio , Pulpotomia , Criança , Pré-Escolar , Combinação de Medicamentos , Feminino , Compostos Férricos/uso terapêutico , Humanos , Masculino , Dente Molar/diagnóstico por imagem , Dente Molar/cirurgia , Estudos Retrospectivos , Silicatos/uso terapêutico , Dente Decíduo , Resultado do Tratamento
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