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1.
J Oral Sci ; 63(3): 298-300, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34193780

RESUMO

Backsliding is a major problem when moving the maxilla significantly forward in orthognathic surgery. For example, in sleep surgery, maxillomandibular advancement is an application of orthognathic surgery, and it is well known that the anterior movement of the maxilla back and forth is an important factor that greatly widens the pharyngeal airway. However, postoperative backsliding is a major problem in this surgery. Therefore, a surgical method was devised to prevent the maxilla from retracting by adjusting the bone when moving the maxilla forward.


Assuntos
Cirurgia Ortognática , Procedimentos Cirúrgicos Ortognáticos , Cefalometria , Maxila/cirurgia , Osteotomia de Le Fort
2.
Orthod Fr ; 92(2): 181-194, 2021 Jun 01.
Artigo em Francês | MEDLINE | ID: mdl-34279230

RESUMO

Posterior open bite is a malocclusion characterized by the absence of vertical contacts between the occlusal surfaces of the posterior teeth of the opposing arches. It can be uni- or bilateral and involve one tooth or more. Several aetiologies of these posterior open bite have been described, including pathological eruptions, dento-maxillary dysmorphosis and temporo-mandibular dysfunctions. When considering a correction or compensation, there are several therapeutic options (orthodontic and/or surgical and/or prosthetic). Recent developments in adhesive dentistry (bonding biomaterials, ceramics and composites) have made possible the development of more conservative approach for restorative and prosthetic treatments. In order to understand the possible use of these restorations and the help it can provide in our treatment plan, we have selected three original clinical situations. Each one illustrated a posterior open bite aetiology and explained the rehabilitation strategies chosen (process of decision making and realization). Partial bonded restorations (direct composites, overlays, tabletops, veenerlays) can be considered to compensate open bite, in case of impossibility, failure or as a complement of orthodontic treatments. Additive equilibration is not described in the literature for the compensation of posterior open bite, despite the many functional advantages along a simple and conservative technique.


Assuntos
Má Oclusão , Mordida Aberta , Humanos , Maxila , Mordida Aberta/terapia
3.
J Biol Regul Homeost Agents ; 35(2 Suppl. 1): 9-19, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34281299

RESUMO

The aim of the present study is to describe a new technique through which it is possible to complete the maxillary sinus lift procedure even in case of severe damage or complete removal of the sinus mucosa using the PRGF-Endoret® platelet concentrate. Eighteen patients (ratio F:M=4:5; average age: 58.2 years; DS: 8.85 years) with severe perforation (more than 10 millimetres of diameter) of the sinus mucosa during the maxillary sinus lift procedure were selected. Normally the procedure is interrupted due to impossible stabilization of the graft material inside the subantral cavity. On the contrary, our protocol foreseen the sealing of the perforation using the PRGF autologous gel membranes or the creation of a new sinus pseudomembrane through which the graft material was covered. The PRGF-Endoret were obtained according to the protocol developed by BTI (Biotechnology Institute - Vitoria, Spain). In 14 cases out of 18 implant fixtures were concurrently inserted while in 4 cases the fixture insertion was postponed after 6 months: 37 fixtures were inserted (27 at the same time and 10 after 6 months). 2 months after surgery the CBCT showed a correct pneumatization of the maxillary sinus in 16 patients out of 18 (89% of cases), while after 12 months the radiological normalization of the maxillary sinus was present in 17 patients out of 18, bringing the healing rate to 94% of cases. Regarding implant healing, 2 out of 37 implants inserted were lost in the first month after the surgical phase, whereas 12 months after prosthesis application the other 35 implants were perfectly osteointegrated with a healing rate equal to 94.6% of the fixtures. 36 months after the surgery all the fixtures were osteointegrated (35 of 37 implants with a percentage of 94.6% of success). We may conclude that the use of PRGF allowed to complete the sinus lift even in case of severe perforation of the sinus mucosa or its total removal thanks to its capability to stabilize the graft, its antibacterial and antifungal activity and its anabolic effect and favouring bone regeneration.


Assuntos
Implantes Dentários , Seio Maxilar , Regeneração Óssea , Humanos , Maxila/diagnóstico por imagem , Maxila/cirurgia , Seio Maxilar/diagnóstico por imagem , Seio Maxilar/cirurgia , Pessoa de Meia-Idade , Membrana Mucosa , Cicatrização
4.
Eur J Paediatr Dent ; 22(2): 125-128, 2021 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-34238002

RESUMO

AIM: The aim of this study was to evaluate maxillary arch changes in patients treated with Invisalign® First system in the mixed dentition, focusing on arch width, arch perimeter, arch depth, molar inclination and alveolar expansion. MATERIALS AND METHODS: A retrospective study was carried out. The sample consisted of 20 patients, 12 females and 8 males, treated with clear aligners for maxillary expansion. Arch widths, arch perimeter, arch depth and molar inclination were measured on pre-treatment and post-treatment digital dental models. Superimposition of digital models was performed to evaluate alveolar expansion. RESULTS: There were significant increases in all measurements regarding arch width and arch perimeter, while arch depth and molar inclination significantly decreased. Alveolar expansion was recorded at all the reference points considered. Shapiro-Wilk test was used to check normal distribution. Average and standard deviations were calculated for all measurements. Paired t-test was run to report significant changes between T0 and T1. The statistical significance was set at p<0.05. Intraclass correlation coefficient was used to assess reliability. CONCLUSIONS: In case of mild crowding or limited transverse maxillary deficiency, Invisalign® First clear aligners could be a reasonable alternative to traditional slow maxillary expanders.


Assuntos
Aparelhos Ortodônticos Removíveis , Técnica de Expansão Palatina , Arco Dental , Dentição Mista , Feminino , Humanos , Masculino , Maxila , Reprodutibilidade dos Testes , Estudos Retrospectivos
5.
Eur J Paediatr Dent ; 22(2): 151-154, 2021 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-34238007

RESUMO

AIM: The aim of this paper is to illustrate a new concept for approaching maxillary expansion in paediatric orthodontics with a metal-free fixed automatic appliance in special-needs patients. CASE REPORTS: The ZeroExpander is a complete CAD-CAT full digital and automatic metal-free fixed device. It is designed to expand the maxilla in a pre-programmed automatic way using deciduous teeth as anchorage. Two cases of growing patients with a narrow upper arch are illustrated to present this innovative system, one in complete deciduous dentition and the second in mixed dentition. Both patients were successfully treated with palatal expansion. In the first case we present the use of PEEK, and in the second one the use of PA12. CONCLUSION: The ZeroExpander, fabricated using metal-free technopolymers and anchored on deciduous teeth, proved to be comfortable and efficient in treating palatal transverse deficiency, without the need of any compliance, even in young patients who must periodically undergo MRI.


Assuntos
Má Oclusão , Técnica de Expansão Palatina , Criança , Arco Dental , Dentição Mista , Humanos , Maxila , Palato
6.
Int J Mol Sci ; 22(12)2021 Jun 18.
Artigo em Inglês | MEDLINE | ID: mdl-34207275

RESUMO

The aim of the study was to quantify the micro-architectural changes of the jaw bone in response to ovariectomy, exposed or not to bisphosphonate treatment. A total of 47 Wistar rats were ovariectomized (OVX) or sham-operated (shOVX) and exposed to osteoporosis preventive treatment for eight weeks either with bisphosphonates (alendronate, ALN; group OVX-ALN) three days/week at a dose of 2 mg/kg or with saline solution (untreated control condition; group OVX). The bone morphometric parameters of the trabecular jaw bone were assessed using ex vivo micro-computed tomography. The regions of interest investigated in the maxilla were the inter-radicular septum of the second molar and the tuber. The regions quantified in the mandible included the three molar regions and the condyle. A one-way analysis of variance followed by pairwise comparison using Tukey's HSD and the Games-Howell test was conducted to explore significant differences between the groups. In the maxilla, OVX decreased the bone volume in the inter-radicular septum of the second molar. Bisphosphonate treatment was able to prevent this deterioration of the jaw bone. The other investigated maxillary regions were not affected by (un)treated ovariectomy. In the mandible, OVX had a significant negative impact on the jaw bone in the buccal region of the first molar and the inter-radicular region of the third molar. Treatment with ALN was able to prevent this jaw bone loss. At the condyle site, OVX significantly deteriorated the trabecular connectivity and shape, whereas preventive bisphosphonate treatment showed a positive effect on this trabecular bone region. No significant results between the groups were observed for the remaining regions of interest. In summary, our results showed that the effects of ovariectomy-induced osteoporosis are manifested at selected jaw bone regions and that bisphosphonate treatment is capable to prevent these oral bone changes.


Assuntos
Conservadores da Densidade Óssea/uso terapêutico , Difosfonatos/uso terapêutico , Mandíbula/ultraestrutura , Maxila/ultraestrutura , Osteoporose Pós-Menopausa/tratamento farmacológico , Animais , Osso Esponjoso/ultraestrutura , Feminino , Humanos , Ratos , Ratos Wistar
7.
J Contemp Dent Pract ; 22(4): 378-387, 2021 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-34267007

RESUMO

AIM AND OBJECTIVE: The present study was conducted to determine the golden proportion, golden mean, and the Preston proportion of the individuals between the widths of six maxillary anterior teeth and to determine which proportional formula exists in the population. MATERIALS AND METHODS: This study was conducted among 60 participants between 18 years and 30 years of age with an esthetic smile. They were grouped into 30 females and 30 males. Maxillary arch impressions were made using irreversible hydrocolloid material from each individual. The width of the anterior teeth on the graph paper was analyzed by using digital vernier caliper. The data were statistically analyzed by one way ANOVA test. RESULTS: The study revealed that the formula of golden proportion and golden mean had no statistical differences between males and females but the Preston proportion has shown statistical differences in the total population. CONCLUSION: From the current study, it was concluded that the formulas of golden mean and golden proportion proposed by Ward can be used for smile designing and full mouth rehabilitations. CLINICAL SIGNIFICANCE: Demand for smiles has gained its importance with time. The golden proportion, golden mean, and the Preston proportion are the guidelines used by the professional for better esthetic proportion in the dentition.


Assuntos
Estética Dentária , Incisivo , Feminino , Humanos , Masculino , Maxila , Odontometria , Fotografia Dentária , Sorriso
8.
J Contemp Dent Pract ; 22(4): 400-405, 2021 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-34267010

RESUMO

AIM: The aim of this bench study was to provide quantitative data addressing the difference between the manual low window design and the corresponding computer-aided design and computer-aided manufacturing (CAD/CAM)-guided design. MATERIALS AND METHODS: Five cone-beam computed tomography (CBCT) scans of as many patients (two males and three females, age range: 61-78 years) with partially edentulous maxilla to be rehabilitated through sinus augmentation, one- or two-step implant placement, and implant-supported prostheses were used to 3D-print the corresponding five maxillary stereolithographic models. Five independent highly skilled maxillofacial surgeons, who were provided with the patients' orthopantomographs, drew on the models the access windows for sinus augmentation according to the "high" (standard) and the low window design both by free-hand and using a surgical guide prepared by computer-guided design. Accuracy and inter-operator variability were analyzed. RESULTS: The results of this study showed that the manual design is associated with a clinically relevant shift in the low window shape, size, and positioning compared with the CAD/CAM-based positioning. All four directions (apical, coronal, mesial, and distal) showed on average the same extent of placement error (approximately 3 mm). Overall, the intra-operator variability was very similar, and measurements were not influenced by the operator (low inter-operator variability). CONCLUSION: The compromised accuracy and reproducibility in the manual design may limit the advantages of the low window technique. Thus, within the limits of this study, the computer-guided approach should be preferred vs the manual approach when performing a low window sinus lift. This may limit intra- and postoperative complications, as well as patient discomfort. CLINICAL SIGNIFICANCE: The "best option" CAD/CAM-guided design should be chosen when performing a low window sinus lift because it reduces discrepancies in selected parameters both between and within groups. This should facilitate the achievement of better results by dentists who have insufficient experience performing implant surgery.


Assuntos
Implantação Dentária Endo-Óssea , Implantes Dentários , Idoso , Desenho Assistido por Computador , Tomografia Computadorizada de Feixe Cônico , Feminino , Humanos , Masculino , Maxila/diagnóstico por imagem , Maxila/cirurgia , Pessoa de Meia-Idade , Reprodutibilidade dos Testes
9.
Indian J Dent Res ; 32(1): 61-68, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34269239

RESUMO

Aim: To assess osteotome-mediated sinus floor elevation (OMSFE) with simultaneous implant placement using an in situ hardening biphasic calcium phosphate (BCP) compared to xenograft as a control. Methods: Patient in need for sinus floor augmentation in one or both sinuses were selected for this randomised controlled clinical trial. Sites presenting a residual sinus floor height of 3-6 mm and eligible for OMSFE were randomly assigned to receive either BCP (test) or xenograft particles (control). CBCT scans were performed before and at the time of implant loading (180 days). The difference in sinus floor height gain between the two groups was set as the primary endpoint parameter for equivalence testing. The implant insertion torque (ITV) was recorded and Implant stability quotients (ISQ) was assessed upon implant placement, abutment connection (160 days) and implant loading (180 days). Results: A total of 54 sinus lifts were performed in 42 patients including 12 bilateral cases. Four implants failed (two in each group) and a total of six patients were lost to follow-up. Statistical analysis of sinus floor height revealed no significant differences (p < 0.05) between groups at baseline nor at 180 days after augmentation. There was no statistical difference in sinus floor height gain between the two groups as supported by the 90% confidence intervals of the difference between groups. Good primary implant stability was confirmed in both treatment groups by ITV and ISQ measurements. Conclusions: Within the limits of this study, it can be concluded that OMSFE using in situ hardening BCP particles results in equivalent sinus floor height gain than using xenograft particles but offers an easier application.


Assuntos
Substitutos Ósseos , Implantes Dentários , Levantamento do Assoalho do Seio Maxilar , Substitutos Ósseos/uso terapêutico , Implantação Dentária Endo-Óssea , Xenoenxertos , Humanos , Hidroxiapatitas/uso terapêutico , Maxila/cirurgia , Seio Maxilar/cirurgia
10.
Indian J Dent Res ; 32(1): 104-109, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34269246

RESUMO

Background: The root and canal morphology of maxillary first permanent molars (MFPMs) is a very widely studied issue in endodontics. However, only one study has been conducted to date on this issue using cone-beam computed tomography (CBCT) in India, and the sample consisted of extracted teeth. Aim: To investigate the root and canal morphology of MFPMs in an Indian population, by using CBCT. Methods and Material: 487 bilateral MFPMs (974 teeth) were assessed and the root and canal morphology were determined according to Vertucci's classification. In addition, the prevalence of a second mesiobuccal canal in the mesiobuccal root (MB2) was correlated with gender, age and arch side. Results: Three roots were most commonly found in the MFPMs regardless of gender (P > 0.05), but this prevalence varied according to the side of the dental arch (P < 0.05). MB2 was present in 77.5% of 3-rooted teeth. Patients above 60 years had a higher incidence of these canals (84.7%) (P < .05). The occurrence of bilateral MB2 was 71.8% in 3-rooted MFPMs. Gender had no significant impact on the occurrence of bilateral MB2 in 3-rooted MFPMs (P > .05). The most common canal configuration was type IV (46.5%) and I (98.9%) in the mesiobuccal and distobuccal roots, respectively (P < .05). The prevalence of MB2 in 3-rooted MFPMs was higher in patients above 60 years of age. Conclusions: The root and canal morphology of MFPMs in an Indian population may have significant variations depending on the dental arch side and patient age.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Dente Molar , Cavidade Pulpar/diagnóstico por imagem , Humanos , Índia , Maxila/diagnóstico por imagem , Dente Molar/diagnóstico por imagem , Raiz Dentária/diagnóstico por imagem
11.
Compend Contin Educ Dent ; 42(7): e1-e4, 2021 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-34270273

RESUMO

Intraoral periapical (PA) radiography is commonly used for measuring the remaining crestal bone height when implants are treatment planned in the maxillary posterior region. A major drawback of conventional radiographs is that a 3-dimensional (3D) entity is compressed and superimposed on itself into a 2-dimensional (2D) image, which is often distorted. Conversely, 3D information can be extracted from computerized tomography. The purpose of this article is to evaluate and discuss limitations of intraoral PA radiography for the measurement of posterior maxillary alveolar bone height and describe the use of information obtained by means of 3D computerized tomography to help plan implant placement. METHOD: Clinical data in this study was obtained from the Implant Database (ID) at New York University College of Dentistry (NYUCD). The data set was extracted as de-identified information from the routine treatment of patients at the Ashman Department of Periodontology and Implant Dentistry at NYUCD. The ID is certified by the Office of Quality Assurance at NYUCD. This study is in compliance with the Health Insurance Portability and Accountability Act (HIPAA) requirements. Thirty-five sites were compared with both PA and cone-beam computed tomography (CBCT) images of the posterior region, including the anatomical relationship of the maxillary crest to the sinus floor. The values recorded from the CBCT were used as the standard to which PA was subtracted from. RESULTS: Linear differences were consistently seen in which the remaining maxillary posterior crestal bone height appeared larger or smaller on the PA radiographs when compared to the measurements made of the same area on the CBCT images. CONCLUSION: CBCT imaging is a valuable adjunct in radio-anatomical and radio-diagnostic observations in the posterior maxillary region. Furthermore, in this study CBCT measurements were shown to be more accurate in assessing the remaining crestal ridge height apical to the sinus membrane when compared to PA radiographs. More research is necessary to verify these findings.


Assuntos
Implantes Dentários , Levantamento do Assoalho do Seio Maxilar , Tomografia Computadorizada de Feixe Cônico , Humanos , Maxila/diagnóstico por imagem , Radiografia , Estudos Retrospectivos
12.
Head Face Med ; 17(1): 30, 2021 Jul 16.
Artigo em Inglês | MEDLINE | ID: mdl-34271939

RESUMO

BACKGROUD: To analyze the morphological changes of the anterior alveolar bone after the retraction of incisors in premolar extraction cases and the relationship between incisor retraction and remodeling of the alveolar base represented by points A and B displacements. METHODS: Pre- (T0) and post-treatment (T1) lateral cephalograms of 308 subjects in the maxilla and 154 subjects in the mandible who underwent the orthodontic treatment with extraction of 2 premolars in upper or lower arches were included. Alveolar bone width and height in both the maxillary and mandible incisor area were measured at T0 and T1 respectively. By superimposing the T0 and T1 cephalometric tracings, changes of points A and B, and the movement of the incisors were also measured. Then the correlation between incisor movement and the displacements of points A and B was analyzed. RESULTS: The alveolar bone width (ABW) showed a significant decrease in both maxilla and mandible (P < 0.001) except the labial side of the mandible (P > 0.05). The alveolar bone height (ABH) showed a significant increase in the labial side of maxilla and a significant decrease in the lingual side of maxilla and mandible. A strong positive correlation was verified between incisor movement and position changes of points A and B in both horizontal and vertical directions. CONCLUSIONS: Anterior alveolar bone width and height generally decreased after orthodontic treatment. Incisor retraction led to significant position changes of points A and B. The decrease of anterior alveolar bone due to significant incisor retraction should be taken into account in treatment planning.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Incisivo , Cefalometria , Humanos , Incisivo/diagnóstico por imagem , Maxila/diagnóstico por imagem , Estudos Retrospectivos , Técnicas de Movimentação Dentária
13.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 56(7): 633-638, 2021 Jul 09.
Artigo em Chinês | MEDLINE | ID: mdl-34275217

RESUMO

Objective: To reconstruct zygomatico-orbtial and maxillary bone defects using three-dimensional (3D) printing technology, so as to provide the basis for complicated maxillofacial bone defects. Methods: Five patients diagnosed with in zygomatico-orbtial and maxillary neoplasm in Department of Oral and Maxillofacial Surgery, General Hospital of Chinese PLA, who need bone defect reconstruction after surgery. Two different customized prosthesis were fabricated by computer aided design and 3D printing techonology, and the length of orbital floor extension in the customized prosthesis were different: Design 1, 9-10 mm orbital floor extension; Design 2, 10-15 mm orbital floor extension. The clinical outcome were evaluated during operation and matching condition of two different designed prosthesis were carried out after scanning for analysis. Results: The results indicated that the deviation value were 2-3 mm located at fixed structure during clinical evaluaton, and the deviation value were about 1 mm after prosthesis scanning. Finally, prothesis of Design 1 were applied for clinical use, and satisfactory reconstruction contour was achieved in all patients. Conclusions: The results suggest that zygomatico-orbtial and maxillary bone defects reconstruction can be conducted with satisfactory effect using 3D printing technology, and design and fabrication factors should be taken into consideration in complicated structure design with multi-protuberance.


Assuntos
Implantes Dentários , Procedimentos Cirúrgicos Reconstrutivos , Desenho Assistido por Computador , Humanos , Maxila/cirurgia , Impressão Tridimensional , Desenho de Prótese , Implantação de Prótese
14.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 56(7): 652-658, 2021 Jul 09.
Artigo em Chinês | MEDLINE | ID: mdl-34275220

RESUMO

Objective: To quantitatively evaluate the accuracy of multi-color and multi-hardness dental models printed by using the photopolymer jetting (PJ) technology, and to provide protocol for the clinical application. Methods: A maxillary partially edentulous (Kennedy class Ⅱ subclass 1) standard digital model obtained through scanning and processing was selected as reference data. Five monochromatic DLP (digital light processing) models with single hardness were printed by printer DLP-800d based on DLP technology (DLP group), and five multi-color and multi-hardness PJ models were printed by printer J300Plus based on PJ technology (PJ group). Scan the printed model and register the scanning data to the reference data in Geomagic Studio 2013 software. The three-dimensional (3D) deviations of the whole and each area, including residual dentition, abutments adjacent to the edentulous area, gingiva, gingiva in the distal-extended edentulous area, gingiva in other edentulous areas, gingiva supporting the removable partial denture (RPD), were calculated and represented by the root mean square error (RMS) value. The smaller the RMS value was, the higher the trueness of printing was. The scanning data of the five models in the same group were registered in pairs to calculate the 3D deviation. The smaller the RMS value was, the higher the precision of printing was. The threshold of clinical acceptability was 200 µm. Statistical analysis was performed to compare the difference of trueness and precision between the two groups. Results: The overall trueness of the DLP group [57.70 (2.10) µm] was significantly better than that of the PJ group [71.00 (7.70) µm]. The overall precision of the DLP group [15.20 (5.05) µm] was significantly better than that of the PJ group [37.55 (15.55) µm]. The overall trueness and precision of both groups were within the clinically acceptable range. Conclusions: The domestic PJ printer used in this study can print multi-color and multi-hardness dental models with good trueness and precision, which can provide integrated 3D printing technology support for realizing the simulation of regional hardness differentiation between soft and hard tissues of dental models.


Assuntos
Desenho Assistido por Computador , Modelos Dentários , Dureza , Maxila/diagnóstico por imagem , Impressão Tridimensional
15.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 56(7): 704-708, 2021 Jul 09.
Artigo em Chinês | MEDLINE | ID: mdl-34275229

RESUMO

Gingival papilla deficiency may cause dental plaque stagnation and food impaction, and may also affect the appearance and pronunciation when occurs in the upper anterior teeth. It has become a common concern of patients and doctors. The aetiological factors of gingival papilla deficiency were complex. Various surgical or non-surgical treatments have been reported. This paper reviews and analyzes the current research progress on the factors and treatment methods of gingival papilla deficiency in domestic and foreign studies, summarizes the factors associated with the gingival papilla deficiency and summarizes the corresponding treatment strategy, so as to provide reference for clinical and research works.


Assuntos
Gengiva , Maxila , Humanos
16.
Prog Orthod ; 22(1): 23, 2021 Jul 19.
Artigo em Inglês | MEDLINE | ID: mdl-34278529

RESUMO

BACKGROUND: The purpose of this study was to identify pretreatment factors associated with the stability of early class III treatment, since most orthodontists start the treatment with their uncertain hypotheses and/or predictions. Subjects consisted of 75 patients with a class III skeletal relationship (ANB < 2° and overjet < 0 mm) who had been consecutively treated with rapid maxillary expansion and facemask and followed until their second phase treatment. The patients were divided into two groups according to whether they showed relapse in follow-up. The stable group maintained their positive overjet (n = 55), and the unstable group experienced relapse with a zero or negative overjet (n = 20). Two general, three dental, and 13 cephalometric pretreatment factors were investigated to determine which factors were associated with stability. RESULTS: Sex, pretreatment age, and anteroposterior functional shift, which were hypothesized as associated factors, were not related to the stability of early class III treatment. Significant differences were detected between the two groups in the horizontal distance between the maxillary and mandibular molars in centric relation. Cephalometric variables, such as the mandibular length (Ar-Me), Wits appraisal, SN to ramus plane angle (SN-Rm), gonial angle, incisor mandibular plane angle (IMPA), and Frankfort plane to mandibular incisor angle (FMIA) showed significant differences between the groups. The horizontal distance was the most influential factor by logistic regression analysis. CONCLUSIONS: Hypothesis (related to sex, age, functional shift) were rejected. Several cephalometric factors related to the mandible were associated with stability. The horizontal distance between the maxillary and mandibular molars in centric relation was the best predictor of early class III treatment relapse.


Assuntos
Má Oclusão Classe III de Angle , Cefalometria , Aparelhos de Tração Extrabucal , Humanos , Má Oclusão Classe III de Angle/diagnóstico por imagem , Má Oclusão Classe III de Angle/terapia , Mandíbula , Maxila , Resultado do Tratamento
17.
Nutrients ; 13(6)2021 Jun 21.
Artigo em Inglês | MEDLINE | ID: mdl-34205632

RESUMO

The abnormal growth of the craniofacial bone leads to skeletal and dental defects, which result in the presence of malocclusions. Not all causes of malocclusion have been explained. In the development of skeletal abnormalities, attention is paid to general deficiencies, including of vitamin D3 (VD3), which causes rickets. Its chronic deficiency may contribute to skeletal malocclusion. The aim of the study was to assess the impact of VD3 deficiency on the development of malocclusions. The examination consisted of a medical interview, oral examination, an alginate impression and radiological imaging, orthodontic assessment, and taking a venous blood sample for VD3 level testing. In about 42.1% of patients, the presence of a skeletal defect was found, and in 46.5% of patients, dentoalveolar malocclusion. The most common defect was transverse constriction of the maxilla with a narrow upper arch (30.7%). The concentration of vitamin 25 (OH) D in the study group was on average 23.6 ± 10.5 (ng/mL). VD3 deficiency was found in 86 subjects (75.4%). Our research showed that VD3 deficiency could be one of an important factor influencing maxillary development. Patients had a greater risk of a narrowed upper arch (OR = 4.94), crowding (OR = 4.94) and crossbite (OR = 6.16). Thus, there was a link between the deficiency of this hormone and the underdevelopment of the maxilla.


Assuntos
Colecalciferol/sangue , Má Oclusão/etiologia , Deficiência de Vitamina D/complicações , Adolescente , Adulto , Feminino , Humanos , Hidroxicolecalciferóis/sangue , Masculino , Má Oclusão/sangue , Má Oclusão/patologia , Maxila/crescimento & desenvolvimento , Maxila/patologia , Pessoa de Meia-Idade , Fatores de Risco , Luz Solar , Adulto Jovem
18.
Orthod Fr ; 92(2): 215-238, 2021 Jun 01.
Artigo em Francês | MEDLINE | ID: mdl-34231469

RESUMO

The objective of this study is to compare, based on literature review, the short and long-term efficiency of the correction of anterior openbite in hyperdivergent adults by orthodontics combined with maxillary molar intrusion using temporary anchorage devices (group A), versus maxillary surgical impaction (group B). The articles were retreived from five databases (last update in May 2020). Data selection and extraction are done independently by two reviewers, then validated and gathered after consensus to limit bias. Twelve low to medium evidence level studies meet the inclusion criteria, including two dedicated to jaw impaction surgery. All the studies analyzed short-term dentoskeletal changes, six assessed long-term stability up to 3.5 years for group B and to 4 years for group A. Both groups showed a decrease in anterior facial height and closure of the anterior openbite by mandibular autorotation. The results were stable over the long term for both groups. The orthodontic solution of molar intrusion associated with skeletal anchorage is an alternative to the surgical solution of mild skeletal openbite in adults. Randomized controlled clinical trials with control groups are essential to reach reliable conclusions.


Assuntos
Mordida Aberta , Procedimentos de Ancoragem Ortodôntica , Adulto , Cefalometria , Humanos , Maxila , Dente Molar/cirurgia , Mordida Aberta/terapia , Técnicas de Movimentação Dentária
19.
Orthod Fr ; 92(2): 195-214, 2021 Jun 01.
Artigo em Francês | MEDLINE | ID: mdl-34231470

RESUMO

The biomechanical adverse effects generated by our treatments must be considered among the failures of mini-implants, certainly excellent means of anchorage. The aim of this article was to illustrate and comment on mechanical adverse effects and to propose solutions. Four common clinical situations in vestibular technique are analyzed, decomposed three-dimensionally and solved. Maxillary incisor intrusion in direct traction (mini-implant between lateral incisors and canines in direct anchorage) can lead to a disto-labial rotation of the supporting teeth and an incisor flaring. Maxillary incisivo-canine retraction (mini-implant between 5 and 6 in direct anchorage) leads to a canine rotation, a clockwise rotation of the occlusal plane and a version of the adjacent teeth. The maxillary molar two-steps distalization (mini-implant between 5 and 6 with metal ligation to the canine) causes a rotation of the adjacent to the spring teeth, an incisor flaring and a molar disto-version. The protraction of a mandibular molar (mini-implant between 3 and 4 in direct anchorage) causes a disto-labial rotation, a lingual torque and a mesio-version of the molar as well as an incisor flaring and a clockwise rotation of the occlusal plan. The compensation bends on the adjacent teeth, the choice of the location and the type of mini-implant, the use of a power arms to get closer to the center of resistance are among the means of resolution. If mini-implants anchorage allows a significant quantitative effect, adverse effects should be considered individually with a three-dimensional biomechanical analysis.


Assuntos
Implantes Dentários , Procedimentos de Ancoragem Ortodôntica , Fenômenos Biomecânicos , Implantes Dentários/efeitos adversos , Análise de Elementos Finitos , Maxila/cirurgia , Técnicas de Movimentação Dentária
20.
J Biol Regul Homeost Agents ; 35(3 Suppl. 1): 139-145, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34289673

RESUMO

The sinus lift with lateral approach is a regenerative technique nowadays considered predictable to increase the height of bone in the atrophic posterior maxilla. Knowledge of sinus anatomy and evaluation of risk factors are the basis of regenerative and rehabilitative surgical success. The positioning and size of the lateral antrostomy represent critical factors in the execution of regenerative surgery, due to the difficulty in transferring radiological information to the lateral wall of the maxillary sinus even for skilled surgeons. The knowhow of guided implant surgery in recent years is also finding use in planning and precisely delineating the lateral access to the maxillary sinus using CBCT imaging and dimensional reconstruction software, through the realization of surgical guides with 3D printing, as shown in the presented case.


Assuntos
Implantes Dentários , Levantamento do Assoalho do Seio Maxilar , Atrofia , Humanos , Maxila/diagnóstico por imagem , Maxila/cirurgia , Seio Maxilar/diagnóstico por imagem , Seio Maxilar/cirurgia , Impressão Tridimensional
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