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1.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 55(10): 737-742, 2020 Oct 09.
Artigo em Chinês | MEDLINE | ID: mdl-33045784

RESUMO

Objective: To explore the accuracy of occlusal contacts on digital model made by intraoral scanner. Methods: Twenty healthy subjects [6 males, 14 females, (24.4±1.4) years old] with intact dentition were randomly recruited from postgraduate students in Capital Medical University School of Stomatology who volunteered to participate in this study. For each participant, the 2nd and 3rd quadrant of natural dentition was scanned. A diagnostic test design was performed. The occlusal contacts of the maximal intercuspal position (MIP) were extracted with the transillumination of silicone interocclusal records, and the extraction threshold was set as ≤50 µm. Intraoral scanning system was used to scan in MIP and generate occlusal contacts on digital model. Five groups were designed as test groups according to included tooth position: group 1 (buccal scanning ranged from tooth 21 to 23), group 2 (buccal scanning ranged from tooth 23 to 26), group 3 (buccal scanning ranged from tooth 24 to 26), group 4 (buccal scanning ranged from tooth 25 to 26), group 5 (buccal scanning ranged from tooth 21 to 26). Five groups occlusal contacts on digital model were generated respectively. According to the relevant literature, the upper occlusal surface was divided into 28 partitions, and the accuracy of occlusal contacts on digital model was calculated with the transillumination of silicone interocclusal records as the reference standard. Subgroup analysis was performed according to anterior teeth area, premolars area and molars area. Results: The accuracy of occlusal contacts on digital models of the half dentition in five buccal scanning positions were: group 1 (86.8%), group 2 (92.0%), group 3 (90.7%), group 4 (91.1%), group 5 (90.4%), and the accuracy of occlusal contacts in group 1 was significantly lower than those in the other four groups (P<0.05). The accuracy of anterior teeth area were 85.6%-93.9%; the accuracy of premolar area were 92.5%-94.4%; the accuracy of molar area were 77.3%-93.6%, group 1 was significantly lower than those in the group 4 in molars area (P<0.05), the accuracy of anterior area was statistically less than premolars area and molars area in group 1 (P<0.05). There was no statistical difference in pairwise comparison between the three sections (P>0.05). Conclusions: The digital models scanned intraoral methods provide accurate, quantitative measures of occlusal contacts when transillumination contacts are the reference standard.


Assuntos
Oclusão Dentária , Testes Diagnósticos de Rotina , Adulto , Dente Pré-Molar , Arco Dental , Feminino , Humanos , Masculino , Dente Molar , Adulto Jovem
2.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 55(10): 743-749, 2020 Oct 09.
Artigo em Chinês | MEDLINE | ID: mdl-33045785

RESUMO

Objective: To quantitatively evaluate the change of the long axis angle and the relative displacement of the crown feature points of the posterior teeth under normal bite force utilizing an intraoral scanner, and to provide clinical reference. Methods: From May to December 2019, fifteen graduate volunteers (5 males and 10 females, aged from 22 to 30, with an average age of 25.7 years) from Peking University School and Hospital of Stomatology were recruited to participate in the study. The surface data (U1, L1) of the maxillary and mandibular posterior teeth were scanned by an intraoral scanner i500, and saved as original data. The volunteers were guided to bite in the intercuspal position with normal bite force. The buccal bite data of the posterior teeth were scanned as the basis for registration. The digital casts were imported into Geomagic studio 2013 software and the boundary lines along the gingival margin and mesial and distal contact area of posterior teeth of data (U1, L1) were determined. Long axis of the crown, crown centroid and mesial functional cusp vertex were establishd. The data (U1, L1) were segmented into single tooth. Single tooth was aligned to buccal bite data separately using best-fit alignment command based on the buccal common area of the crown and new casts data (U2, L2) were obtained as the data under bite force. The long axis angle and centroid distance between adjacent teeth (second premolar and first molar, second molar and first molar) were measured and the deviation between data obtained at mouth-open state and that at biting state was calculated. Negative value meant centroid distance became shorter under bite force. The first molar was set as the common area and registrate the U1, L1 to U2, L2. The angle of long axes, and displacement of centroid and of functional cusp vertex between second premolar of two casts were calculated, as well as between second molar of two casts. Wilcoxon signed rank test was used to analyze the differences of teeth displacement between second premolar and second molar, and between maxillary and mandibular jaws with SPSS 26.0 statistical software. Results: The result of second premolar and second molar in the same jaw had no statistical difference (P>0.05). The centroid distance deviation of mandibular second premolar-first molar [-0.022(0.046) mm] was larger than that of maxilla [-0.006 (0.040) mm] (P<0.05). The long axis angle of second premolar itself [0.913°(0.647°)] and centroid distance of second molar itself [0.102 (0.106) mm] on the mandibular jaw were different from that on the maxillary jaw, which were 0.590°(0.550°) and 0.074(0.060) mm respectively (P<0.05). Conclusions: Under bite force, displacement of the second premolar and second molar was present, including the displacement of centroids and deflection of long axes. The mandibular posterior teeth have larger displacement than the maxillary teeth.


Assuntos
Força de Mordida , Dente Molar , Adulto , Dente Pré-Molar , Oclusão Dentária , Feminino , Humanos , Masculino , Maxila , Dente Molar/diagnóstico por imagem
3.
Am J Orthod Dentofacial Orthop ; 158(4): 599-611, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32988568

RESUMO

Growth modification is a feasible approach for the treatment of skeletal Class II malocclusion. A positive association was found between the lateral functional shift of the mandible due to occlusal prematurities and skeletal changes. This finding is reminiscent of an equivalent anteroposterior skeletal effect of the anterior functional shift of the mandible. Inclined planes can be considered as a form of premature contact. In this case, bonded occlusal maxillary and mandibular bite raisers were used to create occlusal prematurities artificially. These bonded inclined bite raisers are used in conjunction with full-time light short Class II elastics. The results showed an improvement in profile convexity and achievement of Class I canines and molars. The bonded inclined bite raisers combined with light and short intermaxillary elastics can correct Class II malocclusion and improve the soft tissue profile.


Assuntos
Má Oclusão de Angle Classe II/diagnóstico por imagem , Má Oclusão de Angle Classe II/terapia , Cefalometria , Oclusão Dentária , Humanos , Mandíbula , Maxila
4.
Rev. cient. odontol ; 8(2): e026-e026, mayo-ago. 2020.
Artigo em Espanhol | LILACS, LIPECS | ID: biblio-1119392

RESUMO

Para el rehabilitador oral, resulta fundamental determinar con precisión la orientación del plano oclusal en pacientes con distintas alteraciones, como desgastes severos, edentulismo parcial, total y sus consecuencias. Es importante que este sea lo más cercano posible a la posición que ocupaba en dentición natural, ya que influye principalmente en la función oclusal, de los músculos masticatorios, en la articulación temporomandibular, en la fonética y en la estética. Además, la correcta determinación constituye la base de la planificación, por ser el plano de referencia estético y funcional; determina la guía anterior, los patrones de movimiento mandibular, la eficiencia masticatoria y la dimensión vertical. Por ello, el propósito de este estudio es evaluar los métodos más utilizados y confiables para la determinación del plano oclusal, mediante una revisión de la literatura científica actual. A partir de lo investigado, se concluye que el plano oclusal debe ubicarse en la posición que ocupaban los dientes naturales, y su determinación incluye una secuencia clínica, que se inicia por el sector anterior en reposo y sonrisa, y continúa con el sector posterior. No existe un método absoluto. Es importante el análisis individual de cada paciente para decidir qué métodos serán los más indicados. Existen métodos que incluyen el análisis cefalométrico o tridimensional, lo que aporta una mayor precisión en la planificación. (AU)


In oral rehabilitation, it is fundamental to accurately determine the orientation of the occlusal plane in patients with different occlusal alterations such as severe wear, partial and total edentulism and their consequences. It is important that the occlusal plane be as close as possible to the position occupied in natural dentition, since it mainly affects occlusal function, the masticatory muscles, the temporomandibular joint, phonetics and aesthetics. In addition, correct determination is the basis of treatment planning, as it is the aesthetic and functional reference plane, and determines the previous guide, mandibular movement patterns, masticatory efficiency and vertical dimension. Thus, the purpose of this study was to provide a review of the current scientific literature on the most commonly used and reliable methods for determining the occlusal plane. According to the literature, the occlusal plane should be located in the position occupied by the natural teeth, and its determination is made following a clinical sequence starting with the anterior sector at rest and while smiling, continuing with the posterior sector. There is no method of choice. However, individual analysis of each patient is important to determine the most adequate method. Methods including cephalometric and/or three-dimensional analysis provide greater precision for treatment planning. (AU)


Assuntos
Humanos , Cefalometria , Oclusão Dentária , Má Oclusão
5.
Indian J Dent Res ; 31(3): 363-367, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32769268

RESUMO

Aim: This study describes the relationship of the chronophysiological organization of the lateral teeth occlusion and the parameters of the chewing unit of the human dentofacial system (bioelectric potentials, the force of the masticatory muscles, masticatory efficiency) which should be considered in modeling of prosthesis occlusal surfaces. Materials and Methods: Examination of 200 respondents with a "day" chronotype, with Angle class I bilateral occlusion at the age of 18-35 years was conducted daily for 3 days. From 8.00 to 20.00, every 4 hours, the amplitude of the electromyography, the jaw muscles' force, the masticatory efficiency, the area of the occlusal contacts, and the near-contact zones were determined. Results: The activity of the masticatory muscles increased during the period from 12.00 to 16.00, which coincided with the escalation of the masticatory efficiency and of the occlusal contacts area. The relationship between the occlusal surfaces' relief and masticatory efficiency is described by two types of occlusal surfaces' topography - smoothed and pronounced, differing by the ratio of the areas of the occlusal contacts and the near-contact zones in 0.25- and 1-mm wide. Conclusion: The modeling of the occlusal surface of the permanent prosthetic restorations for patients with the "day" chronotype should be carried out with the area values of occlusal contacts and near-contact zones corresponding to the period of masticatory muscles activity from 12.00 to 16.00 and in accordance with the characteristic type of the occlusal surfaces' relief.


Assuntos
Oclusão Dentária , Má Oclusão de Angle Classe I , Eletromiografia , Humanos , Mastigação , Músculos da Mastigação
6.
J Prosthet Dent ; 124(3): 274-349, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32811666

RESUMO

This comprehensive review of the 2019 restorative dental literature is offered to inform busy dentists regarding remarkable publications and noteworthy progress made in the profession. Developed by the Scientific Investigation Committee of the American Academy of Restorative Dentistry, each author brings discipline-specific expertise to 1 of 8 sections of the report: (1) prosthodontics; (2) periodontics, alveolar bone, and peri-implant tissues; (3) implant dentistry; (4) dental materials and therapeutics; (5) occlusion and temporomandibular disorders; (6) sleep-related breathing disorders; (7) oral medicine and oral and maxillofacial surgery; and (8) dental caries and cariology. The report targets important information likely to influence day-to-day dental treatment decisions. Each review is not intended to stand alone but to update interested readers so that they may visit source material when greater detail is desired. As the profession moves toward evidence-based clinical decision-making, an incredible volume of potentially valuable dental literature continues to increase. It is the intention of this review and its authors to provide assistance in negotiating the extensive dental literature published in 2019. It is our hope that readers find this work useful in the clinical management of dental patients.


Assuntos
Cárie Dentária , Materiais Dentários , Oclusão Dentária , Humanos , Periodontia , Prostodontia , Estados Unidos
7.
J Prosthodont ; 29(8): 725-729, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32794594

RESUMO

Amyloidosis of the tongue can result in significant and irreversible alterations of tooth position and function due to prolonged application of imbalanced force on the teeth by the enlarged tongue. Due to the rarity of this oral form of systemic disease, little has been elucidated on management of the resulting impaired oral function. While surgery can address the size of the tongue, it carries significant morbidities, enlargement can recur, and does not address adverse tooth positioning. Prosthetic rehabilitation can more aptly restore oral function but it also needs to be tailored based on the patient's expectations and goals as well as biologic and mechanical parameters of treatment. This report discusses an effective and noninvasive application of a tooth-supported, removable prosthesis with an onlay occlusal design to restore occlusion, speech, and esthetics in a patient with tongue-based amyloidosis.


Assuntos
Amiloidose , Estética Dentária , Doenças da Língua , Amiloidose/complicações , Oclusão Dentária , Humanos , Língua/cirurgia
8.
Int J Comput Dent ; 23(3): 245-255, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32789312

RESUMO

AIM: The aim of the present study was to evaluate the number, strength, and position of occlusal contacts shown using an intraoral scanner (IOS) and a digital occlusal analysis system (T-Scan) compared with the current gold standard using occlusal foil (OF). MATERIALS AND METHODS: Occlusal contacts were analyzed for 70 volunteers using OF in maximum intercuspation (MI). The contact points obtained using the IOS were evaluated using a screenshot from Zirkonzahn.Modellier CAD software. Finally, the volunteers were asked to bite on the sensor sheet of the T-Scan system. For the evaluation of these data, the contact points of the OF and the IOS were graded as light, medium, and strong. Furthermore, the positions of the contact points were analyzed for the anterior region (premolars and molars). Parametric statistical tests were applied to analyze the differences among the three methods. RESULTS: The mean number of all contact points was similar: 29 ± 8 with the OF, 30 ± 12 with the IOS, and 24 ± 10 with the T-Scan. However, results were different in terms of the grading of the strength of contact points: mean number of light contacts: 8 ± 4 OF vs 17 ± 8 IOS and 17 ± 6 T-Scan; medium contacts: 12 ± 5 OF vs 8 ± 4 IOS and 5 ± 4 T-Scan; and strong contacts: 9 ± 5 OF vs 6 ± 6 IOS and 4 ± 2 T-Scan. The positions of the occlusal contact points were also different. CONCLUSION: The data sets showed that there were differences in the distribution of occlusal contact points evaluated using the OF, the IOS, and the T-Scan system. Although the number of detected occlusal contacts was similar, different occlusal contact protocols were determined by the three different methods.


Assuntos
Oclusão Dentária , Dente Molar , Dente Pré-Molar , Humanos , Software
9.
Orv Hetil ; 161(28): 1166-1174, 2020 07.
Artigo em Húngaro | MEDLINE | ID: mdl-32609624

RESUMO

INTRODUCTION AND AIM: The aim of our study was to investigate the influence of the occlusal support, and mandibular third molars on mandibular angle and condylar fractures. METHOD AND RESULTS: Patients with unilateral and isolated angle or condylar fractures were included in this retrospective, cross-sectional study. Data was collected from patient records and panoramic x-rays. The predictor variables included the type of occlusal support and the presence or absence of third molars. The outcome variable was angle or condylar fracture, while other predictor variables included demographic factors. Bivariate (χ2 test) and logistic regression analyses were conducted to investigate the associations between variables and the outcome. 43 angle (mean age: 29.9 ± 12.8 years; 98.4% male) and 37 condylar (mean age: 46.8 ± 20.2 years; 62.2% male) fracture cases were included in this study. Bilateral occlusal support was present in 81.4% of angle fracture group and in 51.3% of condylar fracture group (p<0.001). In the case of bilateral occlusal support, an odds ratio (OR) of 4.2 was found for angle fractures (p<0.006). A third molar was present in 86% of the angle fracture group and in 43.2% of the condylar fracture group (p<0.001). The presence of a third molar exhibited an odds ratio of 8.1 for the angle fractures (p<0.001). When bilateral occlusal support and third molar were present simultaneously, the risk was 15.9 times higher for an angle fracture (p<0.001). CONCLUSION: The presence of occlusal support and/or third molars was significantly associated with angle fractures, however, the absence of occlusal support and/or third molars significantly correlated with condylar fractures. Orv Hetil. 2020; 161(28): 1166-1174.


Assuntos
Oclusão Dentária , Mandíbula , Côndilo Mandibular/lesões , Fraturas Mandibulares/etiologia , Dente Serotino/anatomia & histologia , Dente Impactado/complicações , Adolescente , Adulto , Idoso , Estudos Transversais , Feminino , Humanos , Incidência , Masculino , Fraturas Mandibulares/epidemiologia , Pessoa de Meia-Idade , Dente Serotino/diagnóstico por imagem , Radiografia Panorâmica , Estudos Retrospectivos , Fatores de Risco , Coroa do Dente/diagnóstico por imagem , Adulto Jovem
10.
Prim Dent J ; 9(1): 32-36, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32519605

RESUMO

The effects of breastfeeding on the occlusion have been much debated, and it is often suggested that breastfeeding facilitates optimal development of the jaws and the dentition, thus preventing the development of a malocclusion. Despite these claims, the evidence is equivocal, and the majority of studies are of low quality and only assess the deciduous dentition. Therefore, at present there is currently no high quality evidence to support claims that breastfeeding has a positive effect on the occlusion, thus the method of feeding should be chosen due to the health benefits and personal preference, not due to any claims regarding occlusal benefits that cannot be substantiated.


Assuntos
Aleitamento Materno , Má Oclusão , Alimentação Artificial , Oclusão Dentária , Feminino , Humanos , Dente Decíduo
11.
Prim Dent J ; 9(1): 43-48, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32519607

RESUMO

The relationship between temporomandibular disorders (TMDs) and occlusion remains controversial. Some authors believe that occlusion is the primary factor in the onset of TMD symptoms, whereas others feel that occlusion has no role in this at all. The majority of reasoning behind causation is based upon anecdotal rather than scientific evidence. Existing evidence in the literature supports the absence of a disease-specific association. This article describes this controversy and provides the reader with findings from contemporary literature.


Assuntos
Má Oclusão , Transtornos da Articulação Temporomandibular , Oclusão Dentária , Humanos
12.
Prim Dent J ; 9(1): 27-31, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32519611

RESUMO

This article addresses facts and fallacies about managing worn teeth and challenges some traditional concepts and beliefs about occlusion. Whilst it is accepted that many of the historic occlusal concepts were well intended, closer examination reveals that many were unnecessarily destructive of sound tooth tissues and did not deliver all of their purported benefits. Those fallacies make them less appropriate in the litigious environment of contemporary dental practice. This paper discusses the disadvantages of 'subtractive' dental procedures for the management of tooth wear, and highlights the benefits of proven minimally destructive 'additive' techniques.


Assuntos
Atrito Dentário , Desgaste dos Dentes , Oclusão Dentária , Restauração Dentária Permanente , Dentição , Humanos
13.
Int J Esthet Dent ; 15 Suppl 1: S32-S45, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32467933

RESUMO

Bilateral or unilateral congenitally missing maxillary lateral incisors is a common clinical situation that requires an interdisciplinary approach. It is often complicated by the presence of narrower teeth. Occlusal, periodontal, and esthetic considerations will influence the decision to close the space for a canine-lateral substitution or to open the space for a prosthodontic replacement of the missing lateral incisor. The team should define the proper dental position to provide a stable occlusion and dental esthetics obtained with a minimally invasive preparation. The restorative approach should provide a long-term functional and esthetic solution in the transitional period from adolescence to adulthood, reversible for future possible interventions.


Assuntos
Anodontia , Estética Dentária , Adolescente , Adulto , Oclusão Dentária , Humanos , Incisivo , Maxila
14.
J Contemp Dent Pract ; 21(1): 97-104, 2020 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-32381809

RESUMO

AIM: The aim of this study is to establish a proportion between the inferior border of mandible and lower edge of the mental foramen and inferior border of mandible to occlusal plane for dentulous subjects and to evaluate the validity of this proportion in orienting the occlusal plane for edentulous subjects. MATERIALS AND METHODS: The occlusal plane was evaluated in the selected 50 dentulous and edentulous subjects for its relation to the mental foramen and inferior border of the mandible. The orthopantograms obtained were traced with the markings and the measurements were tabulated under different headings. After measuring the distances, the proportion between the distances was determined. The mean proportions of dentulous, edentulous, male, and female subjects were evaluated. Then the proportion of male subjects was compared with that of female subjects and dentulous subjects with that of edentulous subjects. Comparison of proportion between the different groups was done by using unpaired t test. The mean and standard deviation (SD) were determined for each group separately and were compared within each group. From the calculated "t" value, "p" the probability for error was found out. RESULTS: In dentulous subjects, the proportion ranged from 1:3.53 to 1:4.40. The mean was 1:3.90. In edentulous subjects, the proportion ranged from 1:3.50 to 1:4.15. The mean was 1:3.84. On comparison, the difference between both the groups was 0.06. The difference was statistically insignificant (p = 0.14). In the comparison of dentulous male and female subjects, the difference obtained was 0.02. The difference was statistically insignificant (p = 0.77). The comparison of edentulous male and female subjects and the difference obtained was 0.03. The difference was statistically insignificant (p = 0.51). CONCLUSION: The derived proportion of 1:4 between the inferior border of mandible and mental foramen and inferior border of mandible and occlusal plane in edentulous patients as measured on an orthopantogram may yield a plane of occlusion similar to that existing in the dentulous state. CLINICAL SIGNIFICANCE: The above-drawn proportion between the inferior border of the mandible to the lower edge of the mental foramen and between the inferior border of the mandible and the occlusal plane in edentulous patients may yield a plane of occlusion which is oriented similar to that existing in the dentulous state. The proportions derived radiographically in this study can serve as a basis for future studies to establish the occlusal plane for edentulous subjects.


Assuntos
Oclusão Dentária , Boca Edêntula , Feminino , Humanos , Masculino , Mandíbula , Forame Mentual , Radiografia Panorâmica
15.
J Prosthodont ; 29(6): 466-471, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-32369876

RESUMO

PURPOSE: To analyze the perceptions of laypersons, dental students, and dentists regarding disparities of the maxillary dental midline and the occlusal plane (OP) when analyzing their own 2D or 3D clinical simulation. MATERIAL AND METHODS: 20 participants per group volunteered (N = 60). Intraoral and facial scans, and a photograph were obtained from each participant. Two simulation groups were created: 2D and 3D groups, which were subdivided into two subgroups. In the first subgroup, the OP was modified by 1-degree increments without changing the maxillary midline. In the second subgroup, the OP was modified by the same increments, but the maxillary midline was altered to match the OP inclination. Participants were asked to rate the simulations on a 1-to-6 scale and a question survey. Ordinal logistic regression (OR) was used to analyze the ratings. RESULTS: Tilt of the OP had the strongest negative effect on the ratings which was further amplified by the dental midline inclination (OR = 0.122). Midline modification alone did not affect the ratings (OR = 0.744). 3D simulations had a stronger positive effect on the ratings compared to 2D simulations. For dental students, the positive rating effect of 3D simulations was similar to dentists. For laypersons, the positive rating effect of 3D simulations compared to the 2D simulations decreased relative to dentists. The survey revealed that 45% of the dentists, 80% of the students, and 50% of the laypersons preferred the 3D simulation. CONCLUSIONS: The type of dimensional representation affected the esthetic perception of all participants. 3D simulations obtained higher esthetic ratings for the same esthetic discrepancy than 2D simulations. However, all participants' ratings decreased with increased tilt of the OP and were further decreased with the inclination of the dental midline.


Assuntos
Estética Dentária , Sorriso , Oclusão Dentária , Odontólogos , Face , Humanos
16.
J Prosthodont ; 29(6): 472-478, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-32394526

RESUMO

PURPOSE: Oral function in Down Syndrome (DS) patients has been of interest to clinicians and researchers. This study aimed to evaluate the parameters of occlusal force and pattern of children with Down syndrome (DS) during mixed dentition when compared to age and gender-matched controls. MATERIALS AND METHODS: Thirty DS and 30 healthy children, aged 7 to 12 years, participated in the evaluation of the parameters of the occlusal pattern and occlusal force distribution analysis. Both groups underwent clinical examination, occlusal force and pattern measurements using a computerized occlusal analysis system (T-Scan 8 occlusal analysis, Tekscan, Inc., S. Boston, MA). Occlusion time, percentage of force distribution, force outliers, center of force target area, center of force trajectory and evaluation of closure arc were compared between the two groups using the Pearson's Chi Square test. RESULTS: Children with DS had more occlusal and vertical malocclusion compared to the control group (p < 0.001). The occlusion time for DS group (0.75 ± 0.7s) was significantly longer than the control group (0.015 ± 0.05s) (p < 0.001). The closure arc for DS group was mostly irregular (53%), while the control group showed ideal closure arc. In control group, the age had a significant influence on the occlusion time, while height, weight, and BMI had a significant influence on the mouth opening. None of these variables had such effect on children with DS. CONCLUSIONS: The results of this study showed high prevalence of orofacial dysfunction among DS population. The occlusal analysis showed that children with DS had longer occlusion time and a lack of ideal occlusion pattern compared to age matched controls.


Assuntos
Síndrome de Down , Má Oclusão , Força de Mordida , Criança , Oclusão Dentária , Dentição Mista , Humanos
17.
Niger J Clin Pract ; 23(5): 596-602, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-32367864

RESUMO

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


Assuntos
Fenda Labial , Imageamento Tridimensional/métodos , Odontometria/métodos , Coroa do Dente/diagnóstico por imagem , Estudos de Casos e Controles , Criança , Fissura Palatina/patologia , Oclusão Dentária , Feminino , Humanos , Processamento de Imagem Assistida por Computador/métodos , Masculino , Maxila , Estudos Retrospectivos , Coroa do Dente/patologia
18.
J Oral Maxillofac Surg ; 78(9): 1627.e1-1627.e5, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32380003

RESUMO

Intraoperative verification of the planned occlusion is critical in ensuring the accuracy of orthognathic surgery. This step is limited to visual inspection, which can be especially challenging when the planned occlusal setup is less-than-stable. The authors introduce a cost-effective method of an accurate reproduction of the planned occlusion using additive manufacturing which can aid in intraoperative verification of positionally unstable occlusal setups. The authors present a case example, and discuss various technical considerations.


Assuntos
Cirurgia Ortognática , Procedimentos Cirúrgicos Ortognáticos , Oclusão Dentária , Mandíbula
19.
Am J Orthod Dentofacial Orthop ; 157(4): 533-541, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32241360

RESUMO

INTRODUCTION: The purpose of this study was to evaluate the occlusal contact area and cast-radiograph evaluation (CRE) score changes in patients with 3 different retention protocols after a 1-year retention period. METHODS: A total of 90 patients with acceptable final occlusion according to American Board of Orthodontics CRE were equally divided into 3 groups according to the retention protocol: upper bonded retainer and lower Essix or bonded retainer (Essix group); upper bonded retainer and Hawley or lower bonded retainer (Hawley group); and upper bonded retainer and lower bonded retainer (bonded retainer group). Digital models were used to assess occlusal contact area changes after a 1-year retention period. The follow-up occlusion models were assessed with the American Board of Orthodontics CRE. RESULTS: Occlusal contact areas increased significantly in the Hawley and bonded retainer groups for all teeth except incisors. The bonded retainer group showed the greatest amount of settling, but differences with the Hawley group were not statistically significant. However, statistically significant decreases in occlusal contact areas were recorded for the Essix group except for incisors. A decrease of CRE scores was seen in the Hawley group, whereas a statistically significant increase was recorded in the Essix group. CONCLUSIONS: Both Hawley and bonded retainers allowed settling of the occlusion during the retention phase, whereas the Essix retainer did not allow relative vertical movement of the posterior teeth. The Hawley group showed improvement in the total CRE score, whereas the Essix group showed worsening.


Assuntos
Oclusão Dentária , Contenções Ortodônticas , Seguimentos , Humanos , Incisivo , Desenho de Aparelho Ortodôntico , Aparelhos Ortodônticos Fixos
20.
Geriatr Gerontol Int ; 20(6): 526-538, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-32307825

RESUMO

Oral frailty is defined as a decrease in oral function accompanied by a decrease in mental and physical functions. Studies showing that people with oral frailty are at high risk of physical frailty, sarcopenia, severe conditions requiring nursing care and death have been reported in Japan. An increase in life expectancy and maintenance of teeth result in a decrease in the effect of the number of teeth. In contrast, a decrease in oral function as a result of aging has been suggested to have major effects on dysfunction and mortality risk. The present report is a narrative review of major clinical studies on the relationships of the number of teeth, dentures, occlusion and oral function with longevity, with the aim of providing information for future studies centered on oral function in Japan or overseas. This review clearly shows the relationships of the number of teeth, dentures, and occlusion with health and longevity. Recent studies have shown that, besides maintenance of the number of teeth, attempting to maintain or increase oral function, having a good diet and maintaining nutritional status are all linked to general health. Decreased oral function is a major risk factor for developing malnutrition and sarcopenia. Oral frailty, a new concept that has been recently introduced in Japan, is considered to have major effects on dental and oral health policies in Japan, in the old-age group, and is expected to be reflected in the dental and oral health policies of various countries, as they also predict increased life expectancies. Geriatr Gerontol Int 2020; ••: ••-••.


Assuntos
Longevidade , Saúde Bucal , Idoso , Idoso de 80 Anos ou mais , Oclusão Dentária , Dentaduras/estatística & dados numéricos , Feminino , Idoso Fragilizado , Fragilidade , Humanos , Japão , Masculino , Dente/anatomia & histologia , Perda de Dente/epidemiologia
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