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1.
Stomatologiia (Mosk) ; 101(4): 53-60, 2022.
Artigo em Russo | MEDLINE | ID: mdl-35943501

RESUMO

OBJECTIVE: The aim is to study of the accuracy of the virtual reposition of the mandible (LF) by comparing the virtual and real position of the LF heads, as well as the analysis of factors contributing to the occurrence of errors. MATERIAL AND METHODS: An experimental model of a human skull with a movable LF was made of radiopaque material. The resulting computed tomogram (CT) of the upper and lower jaws and temporomandibular joint (TMJ) was combined with dental scans of dental rows and CT scans and a report on the position of the heads of the LF was obtained. Then the LF was shifted to another position and this position was fixed. Optical bite recorders were obtained using an intraoral scanner. An experimental model with a fixed new position of the LF was placed in a tomograph and repeated CT was obtained. In the program, according to optical registers, a virtual reposition of the LF was carried out. The correspondence of the virtual and real position of the mandibular heads was compared. RESULTS: The absolute difference of glenoid fossa space between the actual and virtual reconstruction was 0.542±0.3354 mm in the anterior joint section (M±Î´, M - average mean, δ - standard deviation); for the upper joint section - 0.309±0.2246 mm; and 0.260±0.1862 mm for the posterior section. The integral indicator of surface coincidence (q) when the virtual and actual position are directly compared was 0.296±0.1254 (s.u.). CONCLUSION: The total margin of error depends on the following factors: repeated scanning error (teeth arches and bite scans), repeated CBCT error, a combination of scan and CBCT error, a combination of teeth arch scan and bite scan error, error of TMJ separation. The latter two factors were the most significant.


Assuntos
Mandíbula , Articulação Temporomandibular , Arco Dental , Oclusão Dentária , Humanos , Imageamento Tridimensional , Mandíbula/diagnóstico por imagem , Articulação Temporomandibular/diagnóstico por imagem , Tomografia Computadorizada por Raios X/métodos
2.
Int Orthod ; 20(3): 100667, 2022 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-35853801

RESUMO

The following case report describes the non-surgical correction of a unilateral scissor bite using orthodontic mini-implants and cross elastics. An adequate crossbite correction and occlusal setting was achieved.


Assuntos
Implantes Dentários , Má Oclusão , Mordida Aberta , Procedimentos de Ancoragem Ortodôntica , Ortodontia , Adulto , Oclusão Dentária , Humanos , Má Oclusão/terapia , Mordida Aberta/terapia , Técnicas de Movimentação Dentária
4.
Br Dent J ; 232(12): 839-840, 2022 06.
Artigo em Inglês | MEDLINE | ID: mdl-35750805
5.
J Contemp Dent Pract ; 23(1): 105-117, 2022 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-35656667

RESUMO

AIM: To systematically evaluate the literature evidence regarding the suitability of the T-scan occlusal system for implant supported prostheses. MATERIALS AND METHODS: A thorough bibliographic search was conducted on PubMed, Google Scholar, Cochrane library, Web of Science, EMBASE, and Scopus to collect relevant articles published from January 1, 2008 to August 30, 2021, using a combination of the following words:"T-scan," "Implant supported prostheses," and "dental implant" according to the PRISMA guidelines for the focused research question constructed using the PICO criteria. Randomized control trials, prospective studies, retrospective studies on the use of T-scan system in implant-supported prostheses reported in English language were included in the study. RESULTS: This review consisted of 17 studies and 359 patients rehabilitated with 1,126 implants. In 3 studies, removable types of prostheses were given over implants, and in 14 studies, fixed types of prostheses were given. Nine studies determined the percentage of occlusal force magnitude and occlusion time sequence. Three studies measured the localization of the occlusion center. T-scan was used in two studies to measure the amount of gingival crevicular fluid after occlusal adjustment. The follow-up period ranged from 6 months to 2 years or more. CONCLUSION: T-scan proved with better results than other occlusal analysis indicators in terms of occlusion measurement, clinical execution, quantify the location and contact timing, and occlusion in 3D with more precision. CLINICAL SIGNIFICANCE: T-scan occlusal analysis system is widely used in dentistry and there is an increase in the number of studies, so a systematic review evaluating and comparing results is warranted.


Assuntos
Implantes Dentários , Prótese Dentária Fixada por Implante , Oclusão Dentária , Humanos , Estudos Prospectivos , Estudos Retrospectivos
6.
Quintessence Int ; 53(7): 632-642, 2022 Jun 20.
Artigo em Inglês | MEDLINE | ID: mdl-35674169

RESUMO

Bite force (occlusal force) may play a significant role in patient treatment outcomes. However, as a diagnostic risk assessment tool, it has been examined in the literature but is not commonly utilized by practicing clinicians and in academic studies. This diagnostic evaluation may assist the dental clinician in planning tooth- and implant-supported restorations, as damage to the tooth, implant, or restoration may be dependent upon a restoration's resistance to loading conditions. The overall bite force has been estimated to be up to 2,000 N, with a clear sexual dimorphism and age dependence. The magnitude of these forces along the dental arch have been shown to be elevated in the posterior compared to the anterior region. The bite force magnitude has been inversely related to the proprioception, as a significant increase in bite force is seen in patients with endodontically treated teeth as compared to their vital teeth. Bite force has been linked to chewing efficiency, quality of life, and implicated in the life expectancy of the restorations. Restoration life expectancies have been associated with the material selection and preparation design parameters, both of which may be affected by masticatory bite force. Treatment planning criteria for preparation strategies affected by bite force include tooth location, material selection, occlusion pathways, and subsequent occlusal reduction amounts. When implants are used in patients with elevated magnitude of bite force, an increase in the number and diameter of the implants as well as occlusions with reduced occlusal tables buccolingually and lighter contacts may be recommended. An understanding of the magnitude and load of a patient's bite force can assist the dental clinician in the design of dental treatments along with other standard risk assessment criteria.


Assuntos
Força de Mordida , Qualidade de Vida , Assistência Odontológica , Oclusão Dentária , Humanos , Mastigação
7.
Am J Orthod Dentofacial Orthop ; 162(2): e71-e81, 2022 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-35750579

RESUMO

INTRODUCTION: Although the Invisalign appliance has reported difficulty in achieving the overbite outcomes predicted by ClinCheck software (Align Technology, Santa Clara, Calif), the effect of modifications to the material and components of the appliance are largely unquantified. This study aimed to investigate and determine the accuracy of Invisalign in correcting a deep overbite by comparing the predicted outcome from ClinCheck to the achieved posttreatment outcome for treatment groups that use different components of the appliance system. METHODS: A retrospective study was conducted using pretreatment and posttreatment intraoral scans and predicted outcomes (ClinCheck) stereolithography files of 2 groups of consecutively treated adult patients from private specialist orthodontic practices, 1 group treated with EX30 material with no bite ramps (n = 29) and 1 treated with the newer SmartTrack material and precision bite ramps (n = 39). Inclusion criteria comprised nonextraction treatment, with a minimum of 14 dual arch Invisalign aligners using a 2-weekly aligner change protocol. Geomagic Control X software (3D Systems, Rock Hill, SC) was used to measure overbite in the pretreatment, posttreatment, and predicted outcome stereolithography files for each patient. Results were compared with a previously published treatment group that used SmartTrack material and no precision bite ramps. RESULTS: The regression coefficient analysis indicated that for both groups, the deeper the pretreatment overbite and the greater overbite reduction projected according to ClinCheck, there is a linear increase in the discrepancy of overbite expression posttreatment. ClinCheck overpredicted overbite reduction in 96.6% of patients with precision bite ramp in which, on average, 43.4% of the prescribed overbite reduction was expressed. For EX30 patients, ClinCheck overpredicted overbite reduction in 87.2% of patients in which, on average, 55.1% of the prescribed overbite reduction was expressed. CONCLUSIONS: The use of precision bite ramps does not appear to significantly improve the ability of SmartTrack material to predictably open the bite. SmartTrack material with or without bite ramps does not appear to produce better bite opening predictability than that seen with EX30 material.


Assuntos
Má Oclusão Classe II de Angle , Aparelhos Ortodônticos Removíveis , Sobremordida , Adulto , Oclusão Dentária , Humanos , Estudos Retrospectivos
8.
Am J Orthod Dentofacial Orthop ; 162(2): 193-200, 2022 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-35753894

RESUMO

INTRODUCTION: The purpose of this study is to provide an initial investigation into the predictability and characteristics of the mandibular curve of Spee (COS) leveling using the Invisalign appliance (Align Technology, Santa Clara, Calif) and any regions of ineffectiveness in the dental arch. METHODS: This study used a retrospective sample of patients treated by a single experienced Invisalign provider in private practice. All adult patients with Class I or II Angle malocclusions treated using a minimum of 14 Invisalign aligners without intermaxillary elastics, bite ramps, or auxiliaries and a nonextraction mandibular arch from 2013 to 2019 in the practice were selected. Dental models at the initial scan, the ClinCheck prediction, and the actual outcome were analyzed with Geomagic Control X software (version 2017.0.3; 3D systems, Rock Hill, SC). The COS and extrusion of posterior teeth relative to the occlusal plane were measured and compared. RESULTS: Forty-two subjects met the selection criteria. ClinCheck predicted 0.55 mm (P < 0.0001) more COS leveling than the actual outcome. The mean COS leveling accuracy using Invisalign was 35%, and ClinCheck overestimated the leveling in 86% of the patients. The first molars had the lowest accuracy and extrusion relative to the occlusal plane. CONCLUSIONS: To achieve desired clinical treatment goals, there should be a prescribed overcorrection of the mandibular COS leveling within the ClinCheck treatment plan, and the extrusion of mandibular first molars should be a region of focus. The clinician should consider using auxiliary appliances to improve mandibular COS leveling.


Assuntos
Má Oclusão , Aparelhos Ortodônticos Removíveis , Adulto , Oclusão Dentária , Humanos , Má Oclusão/terapia , Mandíbula , Estudos Retrospectivos , Técnicas de Movimentação Dentária
9.
Arch Oral Biol ; 141: 105483, 2022 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-35759825

RESUMO

Among the sensory properties of foods, texture perception is a complex modality due to catastrophic changes during eating. Relating dental conditions and capacity of texture sensation are still paucities in the literature. Different dental areas emphasize the difference in texture sensation. Anterior teeth are responsible for biting, ripping or tearing; while posterior teeth are chewing and grinding. Hence, the absence of any is expected to cause disruptions in mastication functions. The hypothesis of the present study was dental loss or missing is a burden for hardness perception for first-bite and twice chewed for anterior and posterior teeth, respectively. Patient groups were divided according to anterior-posterior tooth deficiencies and hardness sensation was assessed at first bite and twice chewed modal food (white cheese) with various hardness levels obtained with different fat content. The modal food was tested for its physicochemical, textural and sensory properties with dental assessment. Findings suggest that first-bite hardness judgements were not affected by the loss of the anterior. Oppositely, twice chewed hardness has a significant effect on the loss of a posterior tooth. These findings can indicate to future researchers to be tested according to their dental status especially if chewing is necessary for their sensory tests.


Assuntos
Alimentos , Mastigação , Oclusão Dentária , Dureza , Humanos , Sensação
10.
Shanghai Kou Qiang Yi Xue ; 31(1): 96-99, 2022 Feb.
Artigo em Chinês | MEDLINE | ID: mdl-35587678

RESUMO

PORPOSE: To investigate the effect of Insignia system in customized orthodontic treatment. METHODS: A total of 71 patients with malocclusion undergoing orthodontic treatment in Dalian Stomatological Hospital from March 2018 to August 2019 were enrolled, and divided into two groups according to random number table methods. Patients in non-customized group received Damon Q self-locking brackets, while patients in customized group received individualized brackets combined with Insignia appliance. The patients were revisited every 8 weeks in initial phase and thereafter every 6 weeks. The clinical efficacy, number of visits, time required for treatment planning and treatment duration were compared between the two groups. The severity of malocclusion, changes after treatment and improvement before and after treatment were evaluated by peer assessment rating (PAR). The complications and loose brackets during treatment were observed. SPSS 20.0 software package was used to analyze the data. RESULTS: The total effective rate of customized group was significantly higher than that of non-customized group (P<0.05). No significant difference was found in treatment duration between the two groups(P>0.05). The number of visits and time required for treatment planning of customized group were significantly longer than those of non-customized group(P<0.05). After treatment, the midline, tooth dislocation, molar buccal occlusion, overbite, overjet and weighted PAR total scores increased in both groups, and the increase was more significant in customized group(P<0.05). The gingival bleeding rate showed no significant difference between the two groups(P>0.05), while the rate of loose brackets was significantly higher in customized group than in non-customized group (P<0.05). CONCLUSIONS: Compared with non-customized system, insignia customized system has more visits, longer treatment planning time and higher bracket loosening rate, but its effect is better. In general, it has little effect on the treatment duration and does not increase the bracket shedding rate.


Assuntos
Má Oclusão Classe II de Angle , Má Oclusão , Braquetes Ortodônticos , Sobremordida , Oclusão Dentária , Humanos , Má Oclusão/terapia , Desenho de Aparelho Ortodôntico , Braquetes Ortodônticos/efeitos adversos , Resultado do Tratamento
11.
Stomatologiia (Mosk) ; 101(3): 49-60, 2022.
Artigo em Russo | MEDLINE | ID: mdl-35640180

RESUMO

THE AIM OF THE STUDY: Was determination of TMJ anatomical and functional parameters in patients without clinical manifestations of TMJ dysfunction and analysis of possible relationships between them. MATERIAL AND METHODS: TMJ anatomical parameters of 25 volunteers (22-27 years old) without TMJ dysfunction, malocclusion and more than one tooth adentia were determined on CT scans and lab teeth scans: inclination of the distal slopes of the articular eminence (DS AE), height and width of the condyles, height of AE, inclination of the longitudinal axes of the condyles; as well as functional parameters of LJ movements: horizontal condylar inclination (HCI) during protrusion and laterotrusion, lateral condylar inclination during protrusion and laterotrusion, immediate side shift, incisor and canine guidance, and correlations between them were evaluated. RESULTS: The majority of the TMJ anatomical parameters are almost equal by mean values on the right and left sides. The main TMJ functional parameters on the right and left sides also have similar values but much higher variability, asymmetry and unpredictability. The existing anatomical asymmetry of the DS AE is compensated by articular discs, which makes HCI more symmetrical. CONCLUSION: Protrusion movements have a higher probability of reproduction by mechanical articulators while laterotrusion movements have a very low probability. The existence of relationship between the inclination of DS AE and HCI, between HCI and the incisor guidance, between the inclination of DS AE and the incisor guidance is questionable. The conducted research proves the weakness or complete absence of correlation between them.


Assuntos
Síndrome da Disfunção da Articulação Temporomandibular , Articulação Temporomandibular , Oclusão Dentária , Humanos , Incisivo , Côndilo Mandibular/diagnóstico por imagem , Articulação Temporomandibular/diagnóstico por imagem
12.
Stomatologiia (Mosk) ; 101(3): 70-76, 2022.
Artigo em Russo | MEDLINE | ID: mdl-35640182

RESUMO

OBJECTIVE: The aim of the study is to evaluation of the quality of orthodontic treatment by comparing the severity of signs of distal occlusion before the start of orthodontic treatment and after its completion. MATERIAL AND METHODS: Quantitative assessment of the severity of distal occlusion in 83 patients aged 17 to 30 years before and after orthodontic treatment. Depending on the chosen treatment algorithms, the patients were divided into 3 groups. The first group - 34 people - treatment included the use of a functional non-removable orthodontic device (FNT). The second group - 21 people - the treatment was accompanied by the removal of individual teeth of the upper jaw and the retraction of a group of front teeth of the upper jaw. Patients of the 3rd group - 28 people - underwent combined orthodonto-surgical treatment. The severity of distal occlusion was assessed using 3D cephalometric analysis data. To obtain a subjective assessment of the quality of orthodontic treatment, patients were asked to fill out questionnaires before and after orthodontic treatment. RESULTS: The severity of distal occlusion decreased as much as possible as a result of treatment of the first group in 23.07% of patients and the third group (16.63%), which is interpreted by the formulation «significant improvement¼ of the dental anomaly. Patients of the first and third groups had a high degree of satisfaction with the result of treatment, according to the quantitative assessment of the questionnaire. The severity of distal occlusion in the second group was reduced to a lesser extent (55.5%), compared with the first and third groups, which is interpreted as «moderately improved¼. Patients noted an average degree of satisfaction with the result of treatment, as the implemented treatment plan did not meet their expectations in the aesthetic aspect. CONCLUSION: The use of FNT for the extension and normalization of the position of the lower jaw is justified in the case of refusal of patients from combined orthodonto-surgical treatment, as it allows to fully solve the functional, aesthetic and psychological problems of patients, which contributes to improving their quality of life.


Assuntos
Má Oclusão , Qualidade de Vida , Cefalometria , Oclusão Dentária , Humanos , Má Oclusão/cirurgia , Maxila
13.
Stomatologiia (Mosk) ; 101(3): 82-88, 2022.
Artigo em Russo | MEDLINE | ID: mdl-35640184

RESUMO

OBJECTIVE: The aim of the study is to analyze the features of motor patterns formation in the craniocirvical zone with occlusal and functional disorders of the craniomandibular system. MATERIALS AND METHODS: 281 patients (201 women and 80 men) were examined at the age from 21 to 32 years. Two groups of individuals were identified based on the short Gambur test. The first group (I) included persons with intact dentition and without signs of functional disorders (n=30). The second group (II) included persons with intact dentition and dysfunction of the craniomandibular system (CMS) (n=30). All patients were examined by a digital analysis of the occlusal relationship. A digital method of capturing and reconstructing movement was used to assess the motor patterns of the craniocervical zone. Analysis of functional occlusion showed that the first contact in persons with functional impairment is predominantly localized on the molars region (χ2=44.1; df=11, p=0.00001). RESULTS: In analysis of dynamic occlusion, the time exceed for reaching maximum intercuspation position significantly in group II instead of group I 0.127±0.072 sec and 0.261±0.091 sec (p<0.05). Disconnection time in group II was 0.443±0.096 sec, Which significantly differed from group I (p<0.05). Persons with CCM dysfunction head flexion was 11.00° [9.00°; 13.00°], which is significantly higher than in the comparison group 5.00° [5.00°; 5.50°]. In the transverse plane, an increase in the angle of lateroflexion in persons with functional impairments up to 11.00° [10.00°; 11.00°]. Correlation analysis showed the presence of a direct strong connection between the angle of flexion and the time of separation (r=0.76), as well as the time to reach the maximum intercuspation position (r=0.63). CONCLUSION: Thus, functional disorders in the form of occlusal aberrations lead to changes in the cervical spine and head position through the formation of new motor patterns.


Assuntos
Oclusão Dentária , Dente , Adulto , Vértebras Cervicais , Feminino , Humanos , Masculino , Dente Molar , Pescoço , Adulto Jovem
14.
Rev. Odontol. Araçatuba (Online) ; 43(1): 57-61, jan.-abr. 2022. ilus
Artigo em Português | LILACS, BBO - Odontologia | ID: biblio-1361720

RESUMO

A agenesia dentaria é uma anomalia de desenvolvimento caracterizada pela determinação congênita de menor numero de dentes, podendo estar associada a síndromes genéticas ou ocorrer isoladamente. Embora seja considerada uma das anomalias mais frequentes quando envolve terceiros molares, segundo pré-molares e incisivos laterais, sua ocorrência em dentes estáveis, tais como o canino e o primeiro molar permanente é rara. Desta forma, este relato apresentará o caso de uma paciente do sexo feminino, 8 anos idade, que iniciou tratamento de rotina na Clínica de Odontopediatria da UNIFENAS. Na anamnese não foi relatada pela responsável a ocorrência de alterações sistêmicas, nem queixa ou histórico odontológico relevante. No exame clínico odontológico, notou-se o não irrompimento do primeiro molar permanente superior direito (16). Diante dos exames de imagem, foi confirmada a agenesia do dente 16 e também do canino permanente superior direito (13). A agenesia, sobretudo de dentes estáveis e relevantes no arco dentário, pode comprometer o desenvolvimento adequado da oclusão, mastigação, fonação e estética. Desta maneira, é importante o diagnóstico precoce desta ocorrência com o objetivo de favorecer a elaboração de um adequado plano de tratamento e, minimizar as sequelas destas agenesias atípicas(AU)


Dental agenesis is a developmental anomaly characterized by the congenital determination of fewer teeth, may be associated with genetic syndromes or occur in an isolated form. Although it is considered one of the most frequent anomalies when it involves third molars, second lateral premolars and incisors, the occurrence in stable teeth, such as the permanent canine and the permanent first molar is rare. This report will present the case of an 8-year-old female patient who started routine treatment at the Pediatric Dentistry Clinic of UNIFENAS. In the anamnesis, the responsible person did not report the occurrence of systemic alterations, or a relevant dental complaint or history. On dental clinical examination, it was noticed the non-rupture of the permament maxillar right first molar (16). In view of the imaging tests, the agenesis of tooth 16 and also of the permanent maxillary right canine (13) was confirmed. Agenesis, especially of stable and relevant teeth in the dental arch, may compromise the proper development of occlusion, chewing, phonation and aesthetics. Thus, it is of paramount importance to early diagnosis of this occurrence in order to favor the development of an appropriate treatment plan in order to minimize the sequelae of these atypical agenesis(AU)


Assuntos
Humanos , Masculino , Criança , Fonação , Dente Canino , Anodontia , Dente Molar , Oclusão Dentária , Estética Dentária , Mastigação , Anodontia/diagnóstico , Anodontia/terapia
15.
Artigo em Inglês | MEDLINE | ID: mdl-35472111

RESUMO

The clinical syndrome known as posterior bite collapse (PBC) consists of multiple, often pathognomonic factors that deviate from normal, or an occlusion wherein the posterior occlusion is compromised and may ultimately destroy the functional protective capacity of the entire dentition. Secondary clinical sequelae may include accelerated periodontitis progression, temporomandibular disorders (TMD), increasing mobility/fremitus, additional tooth loss, anterior flaring, and loss of occlusal vertical dimension. Etiologic factors may include tooth loss without replacement, orthodontic malocclusions and dentoskeletal disharmonies, periodontitis, accelerated retrograde occlusal/interproximal wear, severe caries, or iatrogenic and conformative dentistry. Not all PBC cases require treatment, but treatment is dependent upon the periodontium's stability and its ability to maintain its form and function. Treatment decisions can also be dependent upon periodontal health, caries, function, occlusion, TMD, esthetics, and phonetics. The purpose of this article is to provide general treatment guidelines based on form and function of the masticatory system for restoring a PBC case when treatment is necessary. This article does not discuss specific mechanics for restoring PBC cases.


Assuntos
Má Oclusão , Periodontite , Transtornos da Articulação Temporomandibular , Perda de Dente , Oclusão Dentária , Humanos , Periodontite/complicações , Periodontite/terapia , Transtornos da Articulação Temporomandibular/complicações , Perda de Dente/complicações , Dimensão Vertical
16.
BMC Oral Health ; 22(1): 127, 2022 04 15.
Artigo em Inglês | MEDLINE | ID: mdl-35428238

RESUMO

BACKGROUND: Occlusal cant (OC) is a malocclusion trait lacking indexing or classification that describes the extent and severity of tilt in the occlusal plane. The aims of this study were to develop an occlusal cant index (OCI) based on the degree of OC detection among orthodontists and laypeople and to validate the newly developed OCI by a panel of experts using content validity. METHODS: The ability to perceive OC was assessed in 134 participants (orthodontists = 67 and laypeople = 67). A frontal photograph of a model with an ideal smile with 0° of OC was obtained and manipulated to create various degrees of OC from 1-5° at the right and left sides. A set of 11 electronic photographs was displayed to the participants. The participants were asked to report whether they detected an OC in each photograph. The collected data was used as a baseline to develop an OCI. Then, a content validation of the OCI was performed using a questionnaire provided to a panel of experts comprising ten orthodontists. RESULTS: The OCI was designed based on the threshold of OC detection. In both orthodontists and laypeople, the accuracy of OC detection increased as the amount of tilt increased. The threshold point of OC detection in orthodontists was at 2°, while in laypeople it was at 4°. There was a significant difference between orthodontists and laypeople in their ability to detect OC at 2-3° of tilt. The content validity index (CVI) showed excellent validity between the item-level CVI and the scale-level CVI of the OCI. CONCLUSION: The OCI was developed and implemented for diagnostic, communication, and research purposes. The index showed strong evidence supporting content validity.


Assuntos
Estética Dentária , Má Oclusão , Oclusão Dentária , Humanos , Má Oclusão/diagnóstico , Ortodontistas , Sorriso
17.
Quintessence Int ; 53(5): 450-459, 2022 Apr 05.
Artigo em Inglês | MEDLINE | ID: mdl-35274511

RESUMO

OBJECTIVE: The term temporomandibular disorders (TMDs) encompasses a variety of disorders of the temporomandibular joint (TMJD) and the associated musculature (MMD). Occlusion and its role in the genesis of TMDs is one of the most controversial topics in this arena. The objective of the narrative review was to summarize the implications of TMDs and its relationship to dental occlusion in two scenarios: 1) TMD as an etiologic factor in dental occlusal changes; 2) The role of dental occlusion as a causative factor in the genesis of TMDs. DATA SOURCES: Indexed databases were searched from January 1951 to August 2021 using the terms TMJ, TMD, temporomandibular disorders, temporomandibular joint, and dental occlusion. CONCLUSION: There is lack of good primary research evaluating true association and showing the cause-and-effect relationship between dental occlusion and TMD. Systematic reviews suggest that the role of occlusion as a primary factor in the genesis of TMDs is low to very low. However, a variety of TMDs can lead to secondary changes in dental occlusion. Distinction between the two is paramount for successful management.


Assuntos
Oclusão Dentária , Transtornos da Articulação Temporomandibular , Humanos , Transtornos da Articulação Temporomandibular/etiologia
18.
J Prosthet Dent ; 127(5): 765.e1-765.e9, 2022 May.
Artigo em Inglês | MEDLINE | ID: mdl-35287971

RESUMO

STATEMENT OF PROBLEM: Wear of the maxillary canine cusps is a common clinical condition which can affect function and esthetics and, in some situations, lead to occlusal pathology. The mechanical behavior of different restorative techniques for the condition is unclear. PURPOSE: The purpose of this in vitro study was to evaluate the biomechanical behavior of direct or indirect restorative techniques used in restoring canine guidance. MATERIAL AND METHODS: Three-dimensional models obtained from 10 extracted undamaged maxillary canines were modeled by using reverse engineering. Each model received 2 different preparations: incisal (I) or incisal and labial (IL), restored with composite resin (CR) or ceramic (C), compared with unrestored teeth (U). Finite element analysis was used to evaluate the total deformation and the maximum principal stress. For the in vitro wear test, 30 teeth were divided into groups: U (control), I-CR, and IL-C. The teeth were wear tested for 240 000 cycles with a 2-mm sliding contact, a load of 49 N applied, with a 4-Hz cycle with a composite resin piston as antagonist. The wear of restorations and antagonists was quantified by the digital image correlation technique. The 1-way analysis of variance test for total deformation and the Tukey test for the maximum principal stress were used (α=.05) to statistically analyze the data. The Friedman test was applied in the comparison between wear cycles, and the Tukey test was used in the comparison among groups. RESULTS: No significant difference was found among groups (P>.05) for the total deformation. IL-CR showed a higher failure probability, reaching stress peaks which exceeded the tensile strength of the material. I-CR showed greater wear in the in vitro test than IL-C (P=.02). No difference was found among groups in antagonist wear (P=.074). CONCLUSIONS: Ceramic restorations with labial involvement show biomechanical behavior closer to that of unrestored teeth in restoring canine guidance compared with composite resin.


Assuntos
Resinas Compostas , Porcelana Dentária , Cerâmica/uso terapêutico , Resinas Compostas/uso terapêutico , Oclusão Dentária , Análise do Estresse Dentário , Estética Dentária , Análise de Elementos Finitos , Teste de Materiais
19.
Int J Comput Dent ; 25(1): 47-56, 2022 Mar 24.
Artigo em Inglês | MEDLINE | ID: mdl-35322652

RESUMO

Sufficient occlusion is a basic prerequisite for the functional efficiency of the occlusal surfaces. Exactly where and in what number the occlusal contacts in the posterior region should be present for this purpose is controversial. The present study investigated the number and location of occlusal contacts on posterior teeth without dental findings, ie, without caries or restorative restorations such as fillings, crowns, etc. Such natural posterior teeth were present in 709 subjects (males (m) = 446: 48.9 ± 13.04 years, females (f) = 283: 52.4 ± 14.23 years) of a subject collective of 1223 subjects (m = 648, f = 575) of the regional baseline study 'Study of Health in Pomerania 1' (SHIP-1). Silicone bite registrations in habitual intercuspation (IP) were evaluated, whereby the test persons were asked to fix the bite block with biting force without biting firmly. The registrations were scanned with a document scanner in incident and transmitted light; a calibration strip was used to determine the transparency threshold of a layer thickness of 20 µm, below and equal to which the transparent zone was considered as a contact or contact area. The Greifswald Digital Analyzing System 2 (GEDAS 2) software was used to determine the number and location of occlusal contact areas tooth by tooth. To define the localization of the contacts, a cross with two concentric circles symmetric to the longitudinal fissure was superimposed on the occlusal surface; this resulted in four inner and four outer quadrants. Thus, the number of pixels in occlusal contact areas per inner and outer quadrant could be determined. The image resolution was 300 dpi. On average (median), the premolars had two occlusal contacts each, the posterior teeth had four to five, and tooth 46 had six contacts. The right and left teeth did not differ in the frequency of occlusal contacts in the Mann-Whitney U test for independent samples. In the maxillary premolars, frequent contact areas were primarily located mesially on the inner and outer slopes of the palatal cusp. In the maxillary molars, the palatal slope of the distopalatal cusp and the inner slopes of the mesiopalatal and distopalatal cusps were frequently affected. On the mandibular premolars, the inner slopes of the buccal cusps and the buccal slope of the distobuccal cusp were particularly frequently addressed; in teeth 35 and 45, the buccal slope of the mesiobuccal cusp was also somewhat more frequently addressed. Teeth 36 and 46 frequently had contact areas on the buccal slope of the distobuccal cusp as well as on the inner slopes of the distal cusps (distobuccal and distolingual), whereas teeth 37 and 47 tended to behave similarly. Epidemiologically, the focus of the frequent contact areas on the respective supporting cusps of the maxillary and mandibular posterior teeth and a distribution of contacts stabilizing the tooth in its position in the dental arch through the interlocking were confirmed. It makes sense to take this into account when designing occlusal surfaces in the posterior region.


Assuntos
Força de Mordida , Oclusão Dentária , Registro da Relação Maxilomandibular , Dente Pré-Molar , Estudos de Avaliação como Assunto , Feminino , Humanos , Masculino
20.
J Oral Biosci ; 64(2): 159-164, 2022 06.
Artigo em Inglês | MEDLINE | ID: mdl-35231627

RESUMO

BACKGROUND: The development of dentition begins in the embryonic oral cavity and progresses in the branchial arches and alveolar bone. Continuous cellular and molecular crosstalk occurs during crown formation, after which the tooth germ begins to migrate apically through the alveolar process into the oral cavity. It eventually comes in contact with its antagonist in the contralateral jaw to establish functional occlusion. Any defect in either step can result in delayed tooth development, the spectrum of which varies from a congenitally missing tooth to an impacted tooth (infraocclusion) with an eruption problem, both of which can impair oral function. HIGHLIGHT: Congenitally missing teeth or eruption problems may result from genetic mutations. Several different mutations have been identified, each causing a distinct phenotype. Thus, it is imperative that medical providers understand the fundamentals of these genetic principles that govern such dental diseases. CONCLUSION: In this review, we focus on several diseases, including congenitally missing teeth and tooth eruption problems. We review these diseases with aspect to their association with a particular syndrome, as well as independently in a non-syndromic capacity. We also review previously identified genetic mutations and discuss the possible mechanisms that cause individual phenotypes by analyzing previous investigations. We also discuss future prospects of how genetic diagnosis and precision medicine could impact the clinical environment in the field of dentistry. ETHICAL APPROVAL: Present study has been carried out in accordance with The Code of Ethics of the World Medical Association and approved by Institutional Review Board of Osaka University Graduate School of Dentistry.


Assuntos
Dentição , Dente , Coroas , Oclusão Dentária , Humanos , Erupção Dentária/genética
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