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1.
J Oral Maxillofac Surg ; 79(1): 205-212, 2021 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-33031774

RESUMEN

PURPOSE: To evaluate whether the distance between the mandibular occlusal plane and mandibular foramen predicts inferior alveolar nerve (IAN) position after the sagittal split osteotomy (SSO) when using a low medial horizontal osteotomy (Posnick's modification). METHODS: This was a retrospective cohort study of patients undergoing bilateral SSOs with the medial osteotomy placed at the level of the mandibular occlusal plane. The primary predictor variable was the vertical distance between the mandibular foramen and mandibular occlusal plane. The primary outcome was IAN position after SSO: contained within the proximal segment or freely entering the distal segment. Secondary predictor variables were age, gender, primary diagnosis, and type of surgery. Descriptive, bivariate, and regression statistics were computed. RESULTS: Thirty-one patients underwent 62 SSOs using a low medial cut; the sample's mean age was 19.6 ± 3.0 years, and 16 subjects were female. Twenty-three subjects had a primary diagnosis of craniofacial anomaly, and 26 subjects underwent bimaxillary surgery. The IAN was contained within the proximal segment in 28 SSOs (45.2%). The distance between the mandibular occlusal plane and mandibular foramen was greater in SSOs where the nerve was contained within the proximal segment (6.9 ± 2.5 mm) versus freely entering the distal segment (4.5 ± 2.7 mm, P < .001). A receiver-operator characteristic curve identified a threshold distance of greater than 5 mm as predictive of the IAN being contained within the proximal segment (sensitivity, 0.89; specificity, 0.85; area under the curve, 0.84; P < .001). When the mandibular foramen was greater than 5 mm above the mandibular occlusal plane, there was an increased odds of the IAN being contained within the proximal segment (odds ratio, 48.3; 95% confidence interval, 10.5, 222.8; P < .001). CONCLUSIONS: The distance between the mandibular occlusal plane and mandibular foramen predicts the position of the IAN after SSO when using a low medial horizontal osteotomy.


Asunto(s)
Mandíbula , Nervio Mandibular , Adolescente , Adulto , Oclusión Dental , Femenino , Humanos , Mandíbula/diagnóstico por imagen , Mandíbula/cirugía , Osteotomía Mandibular , Osteotomía , Estudios Retrospectivos , Adulto Joven
2.
J Prosthet Dent ; 125(1): 41-45, 2021 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-32033790

RESUMEN

A facebow transfer is typically used for mounting a maxillary gypsum cast in an ideal location in a mechanical articulator. However, the facebow transfer procedure is difficult and may cause the patient discomfort. This proposed technique uses a patient's cone beam computed tomography (CBCT) data to reproduce the occlusal plane in relation to digital articulator scan data, align the patient's gypsum cast or intraoral scan data on the reproduced plane, and then transfer the data to a mechanical articulator.


Asunto(s)
Articuladores Dentales , Modelos Dentales , Oclusión Dental , Humanos , Registro de la Relación Maxilomandibular , Maxilar/diagnóstico por imagen
3.
Stomatologiia (Mosk) ; 99(6): 107-110, 2020.
Artículo en Ruso | MEDLINE | ID: mdl-33267554

RESUMEN

The review article examines the methodology for the complex treatment of patients with occlusion anomalies without prior orthodontic treatment, the problems of treating patients with combined jaw deformities, the history of the development and appearance of orthognathic surgery, the prerequisites for the emergence of a two-stage treatment method. Differences between two-step and classic treatment protocols. The authors described the problems associated with the use of the two-stage treatment method, the advantages of the two-stage treatment method in comparison with the classic three-stage approach, examined the goals, objectives and differences of orthodontic treatment, identified the problems associated with the implementation of this treatment method.


Asunto(s)
Anomalías Maxilomandibulares , Maloclusión , Procedimientos Quirúrgicos Ortognáticos , Oclusión Dental , Humanos , Maxilares , Maloclusión/cirugía , Pacientes
4.
Prog Orthod ; 21(1): 44, 2020 Dec 07.
Artículo en Inglés | MEDLINE | ID: mdl-33283252

RESUMEN

BACKGROUND: The purpose of this study is to investigate the heritability of total rotation, matrix rotation, and intramatrix rotation of the mandible in Korean monozygotic (MZ) twins, dizygotic (DZ) twins, and their siblings. MATERIALS AND METHODS: The samples consisted of 75 pairs of Korean twins (39.7 + 9.26 years; MZ group, 36 pairs; DZ group, 13 pairs; sibling group, 26 pairs). Lateral cephalograms were taken, and 13 variables related to internal and external mandible rotation were measured. Three types of occlusal planes (bisected occlusal plane, functional occlusal plane, and the MM bisector occlusal plane) were used to evaluate genetic influence on the occlusal plane. Heritability (h2) was calculated by using the intraclass correlation coefficient (ICC) and Falconer's method. RESULTS: With regard to mandibular rotation, the MZ twin group showed significantly higher ICC values compared to the DZ twin and sibling groups. The ICC mean values for 13 cephalometric measurements were 0.85 (MZ), 0.62 (DZ), and 0.52 (siblings) respectively. The heritability of the total rotation (0.48) and matrix rotation (0.5) between the MZ and DZ groups was higher than that of the intramatrix rotation (- 0.14). All of the three types of occlusal plane showed high heritability, and among the three types, the functional occlusal plane showed the highest heritability (h2 = 0.76). CONCLUSION: Based on these findings that showed a strong genetic effect on total rotation and matrix rotation, maintaining these rotations should be carefully considered in the orthodontic treatment plan, while the lower border of the mandible may be responsive to various treatments. Occlusal plane change, especially with regard to the functional occlusal plane, may not be stable due to strong genetic influences.


Asunto(s)
Oclusión Dental , Gemelos Dicigóticos , Cefalometría , Humanos , Mandíbula/diagnóstico por imagen , Gemelos Dicigóticos/genética , Gemelos Monocigóticos/genética
5.
Orthod Fr ; 91(1-2): 57-67, 2020 06 01.
Artículo en Francés | MEDLINE | ID: mdl-33146134

RESUMEN

Since 1907, the international community has used Angle's classification to assess the mesio-distal relationships of the dental arches. It is the basis of the diagnosis of malocclusion in the sagittal dimension and indicates or not an orthodontic correction treatment. This work was aimed to inventory the classification methods of malocclusions used today. Indices of treatment need were also presented because they are based on one or more occlusal anomalies to indicate treatment. The classifications were criticized and the contribution of a functional analysis based on the use of the trilogy setting, centering and guiding was detailed. The type of anomalies (skeletal and dental) must be completed by the analysis of the occlusal anomaly of setting (centering or guiding) and of the category of occlusion (functional occlusion, functional malocclusion or pathogenic malocclusion), ie its possible pathogenic impact on orofacial structures. A consensus on the classification of occlusal anomalies is necessary in order to better identify the anomalies and their global repercussions, and to better define the needs for orthodontic treatment.


Asunto(s)
Maloclusión , Oclusión Dental , Humanos , Maloclusión/diagnóstico , Maloclusión/terapia
6.
Orthod Fr ; 91(1-2): 69-81, 2020 06 01.
Artículo en Francés | MEDLINE | ID: mdl-33146135

RESUMEN

Standard TMJ is the key to the morphology of the face as it enables the occlusive function and spatially situates the chin. The diagnosis of the temporomandibular joint disorders is made intricate not only by the multifactorial etiology of these pathologies but also by the difficulty to comprehend the pain felt by the patient. Through a review of the literature and our respective practices (over 30 years) and teachings, this article surveys the main principles of temporomandibular joint disorder. As numerous writers have focused on the problems created by TMJ pathologies, it's only natural that various therapeutic approaches be suggested. What primarily matters is that they lead to a stabilization of the occlusion. As far as diagnosis is concerned, only a precise and rigorous protocol - followed by everyone - can produce a therapeutic result that would be acceptable for each patient. The orthodontist can and must be the coordinator of the cross-disciplinary team. He steps in over 72 % of temporomandibular joint disorder cases and proposes the most conservative, cheapest, and the best cost/benefit ratio for the patient.


Asunto(s)
Trastornos de la Articulación Temporomandibular , Oclusión Dental , Humanos , Masculino , Dolor , Articulación Temporomandibular , Trastornos de la Articulación Temporomandibular/diagnóstico , Trastornos de la Articulación Temporomandibular/terapia
7.
Orthod Fr ; 91(3): 191-195, 2020 10 01.
Artículo en Francés | MEDLINE | ID: mdl-33146614

RESUMEN

Studies about orthodontic relapse have always confirmed the occurrence of some occlusal changes after orthodontic treatment. The reopening of premolar extraction spaces is one of the most frequently observed movements and would have several origins : gingival folds, root proximities, muscular imbalance... and particularly unstable end of treatment occlusion. The aim of this systematic review was to study the correlation between quality of the occlusal finishing after orthodontic treatment with premolars extraction and reopening of extraction spaces. The review was undertaken according to PRISMA recommendations from the Cochrane Handbook through an electronic consultation of the PubMed database to identify clinical trials that responded to the PICO research question. Five studies met all the inclusion criteria. Three studies used the Peer Assessment Rating (PAR) in assessing the quality of the occlusal finishing. For two of these studies, there is a correlation between poor occlusal finishing and reopening of extraction space. For the other three studies, no cause-and-effect relationship between these two factors has been proven. The divergence of the published results was explained by the fact that the stability of an orthodontic treatment depends on multiple parameters. Further controlled clinical studies should be conducted to objectively evaluate, without interfering with other parameters, the role of occlusal finishing in the long-term stability of orthodontic treatment.


Asunto(s)
Oclusión Dental , Extracción Dental , Diente Premolar/cirugía
8.
J Appl Oral Sci ; 28: e20200092, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-33111881

RESUMEN

BACKGROUND: The period of functional adaptation to a new conventional complete denture embraces many transitory issues, and this period is directly related to the rehabilitation success. OBJECTIVE: This clinical trial evaluated the influence of the height of mandibular ridge on the masticatory function of complete denture (CD) wearers during the adaptation period. METHODOLOGY: A total of 28 individuals wearing new CDs (NR, n=14, normal mandibular ridges, 64±12.5 years, 9 female; RR, n=14, resorbed mandibular ridges, 69±6.8 years, 9 female) were assessed at 24 hours, 30 days, three months and six months after the insertion of the CDs for masticatory performance (MP, sieves method), satisfaction with CDs (questionnaire) and maximum occlusal bite force (MOBF) (gnatodynamometer). The classification of the mandibular ridges followed the Kapur index. Data of MP and MOBF were analyzed by two-way ANOVA and satisfaction with CDs was analyzed by Generalized Estimating Equations (GEE), α=.05. RESULTS: Participants with NR presented better masticatory performance (p=.000 - NR 30.25±9.93%, RR 12.41±7.17%), general satisfaction (p=.047), retention of mandibular denture (p=.001), chewing ability (p=.037), and comfort of wearing a mandibular denture (p=.000). Regardless of the mandibular ridge, MP (p=.000) was higher at three (21.26±12.07%) and six months (24.25±12.26%) in comparison to 24 hours (18.09±10.89%), the MOBF (p=.000) was higher at three months (78.50±6.49 N) compared to 24 hours (57.34±5.55 N) and 30 days (62.72±5.97 N), and the comfort of wearing a mandibular denture (p=.002) at three months (1.61 ± 0.07) was greater than 24 hours (1.29±0.10) and 30 days (1.36±10). CONCLUSIONS: The study suggests that the participants with NR have higher MP and satisfaction with their CD, regardless of the follow-up period after the insertion of the new CD. After subjects received the CD, a period of 3 months was necessary for achieving better achievement MOBF, MP, and self-perceived comfort with the mandibular denture, regardless of the height of the mandibular ridge.


Asunto(s)
Dentadura Completa , Mandíbula/anatomía & histología , Masticación , Anciano , Fuerza de la Mordida , Oclusión Dental , Femenino , Humanos , Masculino , Persona de Mediana Edad , Satisfacción del Paciente , Encuestas y Cuestionarios
9.
Am J Orthod Dentofacial Orthop ; 158(6): 868-877, 2020 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-33008709

RESUMEN

This case report describes the treatment of a patient with congenital loss of both mandibular lateral incisors and severely retroclined maxillary incisors. The treatment included bilateral extraction of the maxillary first premolars, accurate 3-digital setup, a 2-stage torque control strategy, and intricate mechanic management. The dilemma of tooth-size discrepancy was solved by ideal torque control to avoid interproximal enamel reduction. An ideal Class I molar and canine relation, as well as canine guidance in the lateral excursion movement, was achieved with good stability.


Asunto(s)
Incisivo , Diente Molar , Diente Premolar , Oclusión Dental , Humanos , Maxilar/diagnóstico por imagen
10.
Am J Orthod Dentofacial Orthop ; 158(6): 799-806, 2020 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-33010979

RESUMEN

INTRODUCTION: Patients and parents want shorter treatment times, but it is unclear whether they would compromise outcome quality to shorten treatment. The purpose of this study was to compare orthodontists' and parents' perceptions of finished occlusion and their willingness to extend treatment time to achieve improved outcomes. The effects of elapsed treatment time and patient compliance were also investigated. METHODS: Parallel surveys for orthodontists (n = 1000) and parents (n = 750) displayed simulated treatment outcomes of well-aligned teeth with occlusions in 1 mm increments from 3 mm Class III to 3 mm Class II. Participants rated their preferences on a visual analogue scale (VAS; 0-100) and specified whether they would extend treatment, and for how long, to improve the occlusion. RESULTS: Two hundred thirty-three orthodontists (23%) and 243 parents (32%) responded. Despite differences between the scores given (P < 0.0001), both groups rated Class I occlusion most acceptable (mean VAS = 93.9 and 80.7, respectively) and 3 mm Class III malocclusion least acceptable (mean VAS = 25.9 and 40.9, respectively). Parents were willing to extend treatment more often and for a greater time than orthodontists to improve results (P < 0.0001). In addition, parents were less willing to terminate treatment early (P < 0.05). Both groups perceived existing outcomes as more acceptable if the patient was noncompliant (P < 0.05), but elapsed time in treatment had no significant effect on ratings. CONCLUSIONS: For outcomes with well-aligned teeth, orthodontists and parents agreed on what the most and least acceptable occlusal relationships were. To achieve better outcomes, parents were willing to extend treatment duration more often and for a greater time than were orthodontists. In addition, parents were less willing than orthodontists to terminate treatment early.


Asunto(s)
Maloclusión de Angle Clase III , Ortodoncia , Actitud del Personal de Salud , Oclusión Dental , Humanos , Ortodoncistas , Padres
11.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 55(10): 737-742, 2020 Oct 09.
Artículo en Chino | MEDLINE | ID: mdl-33045784

RESUMEN

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.


Asunto(s)
Oclusión Dental , Pruebas Diagnósticas de Rutina , Adulto , Diente Premolar , Arco Dental , Femenino , Humanos , Masculino , Diente Molar , Adulto Joven
12.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 55(10): 743-749, 2020 Oct 09.
Artículo en Chino | MEDLINE | ID: mdl-33045785

RESUMEN

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.


Asunto(s)
Fuerza de la Mordida , Diente Molar , Adulto , Diente Premolar , Oclusión Dental , Femenino , Humanos , Masculino , Maxilar , Diente Molar/diagnóstico por imagen
13.
J Oral Rehabil ; 47(12): 1503-1510, 2020 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-32966657

RESUMEN

OBJECTIVES: To analyse occlusion time, occlusal balance and lateral occlusal scheme in subjects with various dental and skeletal characteristics. METHODS: A total of 132 subjects (50 males and 82 females) seeking orthodontic treatment were included in this prospective study. Using the T-Scan III version 7.0 (Tekscan Inc, South Boston, MA, USA), the occlusion time, occlusal balance and lateral occlusal schemes were recorded and compared with gender, Angle's occlusal classification, overjet, overbite, space analysis, skeletal and transverse relations. ANOVA, t test and contingency tables analyses were performed. Statistical significance was set at P < .05. RESULTS: Occlusion time was significantly shorter in subjects with balanced occlusion (0.18 seconds, P < .001), Class I normal occlusion (0.35 seconds, P = .028) and Class I skeletal profile (0.37 seconds, P = .002). Occlusion time was significantly longer in subjects with decreased overjet (0.60 seconds, P = .003). There were significant associations between the distribution of occlusal balance and Angles' classes of occlusion, skeletal relationship, overjet, overbite and space analysis (P < .05). Lateral occlusal schemes were only associated with Angle's classes of occlusion and skeletal relationship (P < .05). CONCLUSIONS: Patients with Class I occlusion showed the least occlusion time, the most balanced occlusion and a higher frequency of canine guidance. Nonetheless, potentially balanced occlusion and group function were highly prevalent in all groups; therefore, ideal occlusion must be considered an ideal to inspire and aim for, but cannot be considered an essential requirement of every dental treatment.


Asunto(s)
Maloclusión de Angle Clase II , Maloclusión , Sobremordida , Oclusión Dental , Oclusión Dental Balanceada , Femenino , Humanos , Masculino , Estudios Prospectivos
14.
Am J Orthod Dentofacial Orthop ; 158(4): 599-611, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32988568

RESUMEN

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.


Asunto(s)
Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Cefalometría , Oclusión Dental , Humanos , Mandíbula , Maxilar
15.
Arch Oral Biol ; 118: 104852, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32758761

RESUMEN

OBJECTIVES: Food comminution during chewing is due to intra-oral particle selection and subsequent breakage. Under conditions of habitual chewing and a nearly complete selection, the influence of initial breakage on particle size reduction was studied in trials with a first chewing cycle (N = 1) from a sequence of randomized trials with various cycle numbers. Furthermore, relationships were examined between degree of fragmentation from breakage (r-fr), molar maximal bite force (MBF) and chewing efficiency (the number of cycles needed to half the initial particle size, N(1/2-Xo)). DESIGN: Thirty-one subjects with a natural dentition chewed samples of 2 half-cubes (9.6 × 9.6x4.8 mm) of Optosil®, using sequences with 1-7 cycles, in 2-10 randomized trials; 10 trials with one cycle. Particle size distributions by underweight, characterized by median particle size, X50, were obtained using sieving. N(1/2-Xo) was derived from the log(X50)-log(N) relationship. and r-fr from the cumulative distribution of underweight fractions of damaged particles for N = 1. MBF was determined on both sides of the jaw using a force transducer and averaged. CONCLUSIONS: A strong, decreasing regression occurred in X50 at N = 1 with r-fr (R2 = 0.934, p < 0.001). The decreasing regression of N(1/2-Xo) with r-fr was moderately strong (R2 = 0.454; p < 0.001). Thus, initial size reduction is strongly determined by breakage and overall reduction partly, when chewing small amounts of particles. N(1/2-Xo) vs. MBF and r-fr vs. MBF were weakly related (R2≤0.124, p = 0.052-0.127). The lack of a pronounced relationship between r-fr and MBF suggests that either MBF is not relevant but supra-threshold force, or that another factor, occlusion, may influence breakage.


Asunto(s)
Fuerza de la Mordida , Alimentos , Masticación , Oclusión Dental , Humanos , Tamaño de la Partícula
16.
Rev. cient. odontol ; 8(2): e026-e026, mayo-ago. 2020.
Artículo en Español | LILACS, LIPECS | ID: biblio-1119392

RESUMEN

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)


Asunto(s)
Humanos , Cefalometría , Oclusión Dental , Maloclusión
17.
J Prosthodont ; 29(8): 725-729, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32794594

RESUMEN

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.


Asunto(s)
Amiloidosis , Estética Dental , Enfermedades de la Lengua , Amiloidosis/complicaciones , Oclusión Dental , Humanos , Lengua/cirugía
18.
Indian J Dent Res ; 31(3): 363-367, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32769268

RESUMEN

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.


Asunto(s)
Oclusión Dental , Maloclusión de Angle Clase I , Electromiografía , Humanos , Masticación , Músculos Masticadores
19.
J Prosthet Dent ; 124(3): 274-349, 2020 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-32811666

RESUMEN

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.


Asunto(s)
Caries Dental , Materiales Dentales , Oclusión Dental , Humanos , Periodoncia , Prostodoncia , Estados Unidos
20.
Int J Comput Dent ; 23(3): 245-255, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32789312

RESUMEN

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.


Asunto(s)
Oclusión Dental , Diente Molar , Diente Premolar , Humanos , Programas Informáticos
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