Tooth Contact Area Research Articles

Risk factors contributing to interproximal contact loss between an implant crown and a natural tooth.

Interproximal contact loss (ICL) is considered a prevalent complication for a tooth abutting an implant restoration. While numerous potential causes for ICL have been presented, there is no consensus. A review of the current literature with a focus on possible risk factors was performed. A PubMed search using keywords "implant OR dental implants OR implant supported prosthesis AND proximal contact loss OR ICL OR loss of interproximal contact OR open contact OR interproximal open contact OR adjacent natural teeth" resulted in 81 citations, 9 of which were relevant to the focus question. Additional references were culled from the reference lists in the identified articles. Systematic reviews, case series, and case reports were reviewed with a focus on causation, association, or correlation. Eight systematic reviews and 14 case series were reviewed. The prevalence of ICL has been reported to be as low as 16% and as high as 66%. ICL was more common on the mesial side of implants and when a tooth abuts a splinted implant restoration. The absence of a uniform definition to accurately describe an interproximal (IP) contact and an open IP contact is demonstrated in the literature. A lack of standardized measurement strategies that relate to a needed consensus definition further exacerbates the broad range of reported results regarding ICL. The lack of controls for almost all the ICL literature makes it difficult to draw conclusions and comparisons to unrestored, natural tooth IP contacts and the prevalence of ICL in this patient population. As a result, the available studies are inadequate to support a causal theory and the potential risk factors associated with ICL. There is a large range of reported prevalence for IP contact loss. ICL is more common when a natural tooth abutsa splinted implant restoration. ICL is more common on the mesial, as opposed to the distal, of an implant retained restoration. Consensus in the definition and measurement strategies for ICL needs to be established to provide standardized terminology and methodology. Potential risk factors such as occlusion, restorative material, and tooth contact area need to be investigated.

Fundamental study on estimation of tooth contact area based on combined image from temperature monitor images of tooth surface with a high-speed-camera thermography and on meshing vibration for high reduction ratio hypoid gear with a three-tooth pinion

Fundamental study on estimation of tooth contact area based on combined image from temperature monitor images of tooth surface with a high-speed-camera thermography and on meshing vibration for high reduction ratio hypoid gear with a three-tooth pinion

CLINICAL AND INSTRUMENTAL STUDY RESULTS OF COMPARING DIGITAL OCCLUSION INDICES AT REGISTRATION OF INTERCUSPAL POSITION IN PATIENTS WITH EDENTULOUS SPACES BEFORE AND AFTER PROSTHETIC REHABILITATION

Aim. The research aims at carrying out a comparative clinical and instrumental analysis related to registering occlusal relations of intercuspal contact position in patients with edentulous spaces before and after prosthetic rehabilitation using various registration materials.
 Material and Methods. Examination of 5 patients of both genders aged 28 to 51 years was performed at clinical bases of the department of surgical and prosthetic dentistry of the Faculty of Postgraduate Education at Danylo Halytskyi Lviv National Medical University. Clinically, all patients were provided with a standard diagnostic dental examination including the control of a temporomandibular joint condition, examination of masticatory muscles, as well as the static and dynamic occlusion with the help of articulating wax and paper according to the two-stage Bausch method. The examination also involved impressions of dental arches of both jaws. Their cast models were produced for laboratory study. The received register, involving the use of materials, namely Futar D, metalized wax, and Consiflex, were reexamined for compliance with the intercuspal contact position in all patients. Location of the occlusal contact areas of antagonistic teeth was determined using Bausch Progress 100® 0.1 mm thick articulating paper (Bausch, Germany). Simultaneously, instrumental registration of digital occlusion indices was performed using the T-scan III device (Boston, USA).
 Results and Discussion. While comparing mean values of the percentage distribution between the left and right halves, the greatest asymmetry was recorded with the use of Futar D material in the D mode both before and after treatment. According to the results of performed instrumental study concerning occlusal relations with the help of the T-Scan III device, it was found that in case of applying Futar D registration material in patients before prosthetic rehabilitation, mean values of occlusal forces at MAX on the left were (50.72 ± 13.86)%, on the right they were (49.28±13.86)%, after prosthetic rehabilitation they made up (50.12±8.75)% on the left, and (49.88±8.75)% on the right. In case of Consiflex registration material application in patients before prosthetic rehabilitation, it was found that COF mean values at MAX on the left accounted (41.28±16.97) %, while on the right they accounted (58,72±16,97) %. After prosthetic rehabilitation - (54.72±13.39) % on the left, and (45.28±13.39) % on the right, respectively. The conducted instrumental studies demonstrate challenging opportunities for revealing personalized features of static and dynamic occlusal balance at clinical registration of intermaxillary position of intercuspation by various registration materials and methods.
 Conclusions. 
 1. A uniform contact of dental arches with synchronous contact of all tooth groups is an important feature of physiologically coordinate dentofacial system functioning.
 
 Frequent sliding contacts are observed in ending intercuspal contact position at static and dynamic occlusion. Area of the contact surfaces of the teeth expands with the increase of occlusal pressure in the direction of the maximum intercuspal contact position (maximum intercuspation). At the same time, occlusal pressure occurs in this area, causing the redistribution of functional load of the patients' dentofacial system components.
 Occlusal space in the intercuspal contact position and the maximum intercuspation or the D index, which can be established using the "Tekscan III" digital technology, manifests the spatiotemporal indices of inter-maxillary relations redistribution. The values of these indices in patients with partial anodontia provoke a special interest.
 The use of Futar D registration material at performing clinical and instrumental analysis of digital indices of the transition from intercuspal contact position to maximum intercuspation, allowed establishing the extension of occlusal joining of teeth duration after dental prosthetics by 1.02 times, reduction of the length of joining trajectory by 1.37 times. The use of Consiflex resulted in the identical length of joining trajectory and extension of the duration of occlusal joining of teeth after dental prosthetics by 1.04 times. The application of metalized wax was characterized by the identical length of joining trajectory and prolonged occlusion time after dental prosthetics by 1.61 times.

Analysis of Load-Sharing and Contact Characteristics of the Concentric Face Gear Split-Torque Transmission System with Elastic Supports

The concentric face gear split-torque transmission system (CFGSTTS) is a new form of drive that is primarily used in helicopter transmission systems. Its load-sharing performance among different branches and tooth contact characteristics have a great impact on the service life of helicopter transmissions. It contains ten meshing pairs, the load distribution is complicated, and the tooth contact areas are difficult to determine. Therefore, based on the multi-point constraint method and nonconforming grid, a quasi-static analysis model of the CFGSTTS coupled with flexible supports was established and the load-sharing performance and contact characteristics were studied. The model considered the support stiffness, backlash, installation error, and web structure of the upper face gear, which could comprehensively reflect the meshing state of the system. The load-sharing coefficient curves, tooth contact area diagram, and meshing force were obtained. The results indicated that (1) a larger idler support stiffness and a smaller input gear support stiffness could achieve better load equalization performance; (2) better load equalization between idler gears could be acquired with a lower face gear support stiffness factor of approximately 0.9; (3) increasing the axial mounting error caused the contact area to shift to the top and inner end of the face gear tooth, which was detrimental to the transmission; and (4) adjusting the backlash of the idler gears, input gears, and tail gear had little influence on the load balance and contact.

Reference map of localization of contact points and contact areas of posterior teeth

The aim of the study: to find correlations in age-related characteristics of the localization and shape of the contact points in permanent posterior teeth and to develop a reference card for dentists, reflecting the age-related characteristics of the localization, shape and size of the contact areas of the posterior teeth in adults.Materials and research methods. The linear dimensions, area, shape, vertical and horizontal position in the interdental space of 1224 contact points of the posterior teeth in 236 patients aged 20 to 59 years was assessed based on a comprehensive analysis of intraoral radiographs performed using the bitewing technique, the results of the study of contact points using floss, displaying contact points on dental impressions made using a special technique.Research results. It was found that the interdental spaces of the posterior teeth in adult patients are characterized by the following features: the contact areas of the teeth are displaced in the vestibular direction, the buccal and lingual (palatal) interdental embrasures are asymmetric; dynamics of the depth of occlusal interdental embrasures, linear dimensions and area of contact areas is expressed as average digital values for different age groups: 20-40 years: contact areas – 1×2 mm, S = 2 mm2, depth of occlusal interdental embrasure - 1.5 mm ; over 40 years old: contact pads – 1.5×3 mm, S = 4.5 mm2, the depth of the occlusal interdental embrasure – 1.0 mm.Conclusion. On the basis of the data obtained, a «Reference map of the localization of contact points and contact areas of posterior teeth in adult patients» was proposed, which allows a dentist to obtain data on the features of the topography of the contact areas of the posterior teeth, taking into account the patient’s age during planning and performing interproximal caries treatment.

Effects of Shaft Offset on Vibration and Tooth Contact Area Based on High-Speed Thermography Monitoring under Hypoid Gear Meshing Conditions

Effects of Shaft Offset on Vibration and Tooth Contact Area Based on High-Speed Thermography Monitoring under Hypoid Gear Meshing Conditions

Measurement of proximal enamel thickness of 182 permanent teeth

Objective: To measure the proximal enamel thickness (PET) at the mesial and distal contact areas of the permanent teeth and to provide a reference for interproximal enamel reduction (IPR). Methods: From May 2016 to February 2018, 182 isolated permanent teeth were collected and screened from patients who underwent extraction at Department of Oral and Maxillofacial Surgery, Capital Medical University School of Stomatology. These teeth were extracted for orthodontic purpose or due to severe periodontitis. The patients having teeth extracted were all Beijing residents, Han nationality, and aged (39.5±10.6) years. Ninety percent of the teeth came from patients under 50 years old. These teeth were classified according to different tooth type. The mesial and distal contact areas of these teeth were marked with fluid resin. The isolated teeth were scanned using micro-CT and the enamel thickness was measured and analyzed. The parameters measured included mesial PET (PETm), distal PET (PETd), the distance from mesial contact area to occlusal plane (CAm-OP), the distance from distal contact area to occlusal plane (CAd-OP), the distance from mesial contact area to the cementoenamel junction (CAm-CEJ), the distance from distal contact area to cementoenamel junction (CAd-CEJ) and tooth width (TWmd). Results: The PET gradually increased from the anterior tooth area [(0.63±0.16) mm] to the molar area [(1.46±0.25) mm]. The sum of the PET from the second molar to the contralateral second molar in the maxillary dentition was 31.60 mm, and that of the PET from the second molar to the contralateral second molar in the mandibular dentition was 29.68 mm. The contact areas were located on the occlusal third of the proximal walls of anterior teeth and the middle third of the proximal walls of posterior teeth. The PET were positively correlated with the tooth width between the mesial and distal contact areas (P<0.05). Conclusions: The PET was thinner in the incisor area and thicker in the molar area. IPR should be carried out close to the occlusal side of the proximal walls in anterior teeth and the cementoenamel junction side of the proximal walls in posterior teeth.

Posterior dental compensation and occlusal function in adults with different sagittal skeletal malocclusions

ObjectiveThe aim of this study was to compare posterior tooth inclinations, occlusal force, and contact area of adults with different sagittal malocclusions.MethodsTransverse skeletal parameters and posterior tooth inclinations were evaluated using cone beam computed tomography images, and occlusal force as well as contact area were assessed using pressure-sensitive films in 124 normodivergent adults. A linear mixed model was used to cluster posterior teeth into maxillary premolar, maxillary molar, mandibular premolar, and mandibular molar groups. Differences among Class I, II, and III groups were compared using an analysis of variance test and least significant difference post-hoc test. Correlations of posterior dental inclinations to occlusal function were analyzed using Pearson's correlation analysis.ResultsIn male subjects, maxillary premolars and molars had the smallest inclinations in the Class II group while maxillary molars had the greatest inclinations in the Class III group. In female subjects, maxillary molars had the smallest inclinations in the Class II group, while maxillary premolars and molars had the greatest inclinations in the Class III group. Occlusal force and contact area were not significantly different among Class I, II, and III groups.ConclusionsPremolar and molar inclinations showed compensatory inclinations to overcome anteroposterior skeletal discrepancy in the Class II and III groups; however, their occlusal force and contact area were similar to those of Class I group. In subjects with normodivergent facial patterns, although posterior tooth inclinations may vary, difference in occlusal function may be clinically insignificant in adults with Class I, II, and III malocclusions.

Effect of gear misalignment on contact area: Theoretical and experimental studies

Parallel and angular gear misalignments reduce effective contact area and increase contact stresses, which in turn accelerate gear surface fatigue failure. In the present study, experiments on gear tooth contact area by varying degree and extent of misalignment have been performed. Theoretical model to estimate contact area as a function of misalignment is proposed. A methodology to measure contact area using coordinate measuring machine (CMM) is also discussed.The results of effective contact area obtained from theoretical and experimental studies show good agreement. It is observed that in the case of axial and radial misalignments, the contact patch area reduces linearly in proportion to amount of misalignment while in case of angular misalignment it follows a non-linear behaviour. As far as the angular misalignment is concerned, the contact patch changes from rectangular to quadrilateral and finally to triangular shape depending upon angle of misalignment. At an angular misalignment of 9°, contact patch shifts from quadrilateral to triangular shape. Combined parallel and angular misalignments result in larger reduction in contact area as compared with individual axial, radial and angular misalignment.

Evaluation of the time-varying mesh stiffness for gears with tooth spalls with curved-bottom features

Abstract Gear tooth spalling is one of the most common defects in gear transmission. The loss of surface materials due to tooth spall reduces the Time-Varying Mesh Stiffness (TVMS) of the gear pair, and thus modifies the vibration response of the gear transmission. The evaluation of the TVMS of the gear tooth pair under gear tooth spalling conditions plays an important role in gear dynamic simulation and the corresponding fault feature analysis. Common approaches assume that the tooth spall has a flat bottom with a constant tooth spall depth. This assumption implies an abrupt change in dent depth and cliff-like material loss. However, in practice, the flake of the surface material usually results in a gradually changing dent depth with a curve-shaped bottom. Thus, the modelling of tooth spalls with a flat bottom may result in mesh stiffness differences. To address this shortcoming, this paper proposes a curved-bottom shaped tooth spall to model the tooth spalling geometric features as observed in practice. The proposed method is constructed based on an ellipsoid geometry which is capable of varying radii in three dimensions to best fit the shape of the tooth spall. The foundation stiffness within the double tooth contact area in the proposed method is corrected and the non-linearity of Hertzian contact stiffness is considered. The effectiveness of the proposed method on modelling single and multiple tooth spalls with different shapes and severity conditions is then validated.

Proximal contact areas of maxillary anterior teeth and their influence on interdental papilla

ObjectivesOpen gingival embrasures leading to appearance of black triangles which apart from being unesthetic contribute towards food retention, adversely affecting the health of the periodontium. Correction of such papillary deformities is extremely challenging, which requires an in depth knowledge about the interproximal geometry for the appropriate management of interdental papilla. So, the present study was aimed to determine the proximal contact areas of maxillary anterior teeth and their influence on the interdental papilla. Materials and methodsIn 200 periodontally healthy patients equally divided into 21–40 years (Group I) and 41–60 years (Group II) of age group amounting to a total of 1400 interdental papillae in maxillary anterior teeth were examined to compute the apicocoronal Proximal contact area (PCA), Proximal contact area proportion (PCAP), and dimensions between alveolar crest and apical contact point (D1) to assess their influence on presence or absence of interdental papilla. ResultsThe PCA dimensions were maximum for Central incisor-Central incisor measuring about 3.90 ± 0.93 mm and 3.97 ± 0.90 mm for Group I males and females respectively and 3.86 ± 1.22 mm and 3.63 ± 1.14 mm for males and female patients in Group II respectively. There was a gradual reduction till Canine-Premolar. Similar trend was followed in PCAP and D1. Consistently more dimensions of D1 were observed in Group II as compared to Group I which influenced the presence of papilla which was predominantly found in Group I patients amongst both the sexes. ConclusionThere was a gradual decrease in the PCA and PCAP in the distal direction anteroposteriorly from maxillary central incisors to first premolars on either sides. The younger age group of both the sexes exhibit greater presence of interdental papilla owing to the lesser D1 dimensions as compared to the older patients.

Numerical Simulation-Based Optimization of Contact Stress Distribution and Lubrication Conditions in the Straight Worm Drive

Tooth contact area optimization/meshing of the straight worm pair is vital for improving its operation efficiency. Geometric parameters of a worm helicoid were derived via the gear meshing theory using the equations of the instantaneous contact line. The visualization function and powerful computing capability of MATLAB are used for the numerical analysis where the instantaneous contact line distribution is simulated for particular worm drive parameters, which yields the induced curvature and slip angle in the direction of the line. The above results are used for further optimization of the meshing performance of the straight worm gear and identification of its influencing factors. A case study of the particular cylindrical worm gear in compliance with the GB 10085-1988 Standard of China demonstrate that a reasonable selection of worm gear parameters can extend the contact line and the working range of the tooth surface of the worm gear and/or make the contact line distribution along the worm wheel more uniform, thus improving the local meshing performance.

Status of occlusal contact during sleep bruxism in patients who visited dental clinics – A study using a Bruxchecker®

Objective: Bruxism-induced mechanical load causes various dental problems, and its treatment is challenging. The present study analyzed upper and lower tooth contacts to determine actual occlusal contact during sleep bruxism.Methods: Tooth contact patterns were analyzed in 49 patients attending dental clinics, using a Bruxchecker®, cephalograms, and condylographs.Results: Approximately 80% of individuals demonstrated contact from the anterior teeth to the molar region (ICPM); about 96% had mediotrusive grinding and contact. The tooth contact area increased with the flatness of the anterior occlusal plane. The ratio of the contact area of the anterior teeth to the overall tooth contact area increased with overbite. Bilateral ICPM and mediotrusive contact patterns were associated with a high frequency of temporomandibular disorder symptoms, clicking, and/or pain.Discussion: The tooth contact area, anterior occlusal plane, and overbite are closely related, suggesting that tooth contact with the anterior teeth should be controlled with occlusal therapy.

Effect of head posture on tooth contacts in dentate and complete denture wearers using computerized occlusal analysis system.

Purpose:The purpose of the study was to assess and compare the occlusal contacts in dentate and edentulous patients wearing complete denture with varying head posture.Materials and Methods:Ad hoc sampling of 30 subjects (15 dentate and 15 edentulous) based on inclusion and exclusion criteria was done. Subjects were divided into two groups: dentate and edentulous. Each group was further divided into two subgroups based on two head postures-upright 90° and ventroflexed 30°. For recording of every posture, a new sensor was used, and the subject was asked to clench on the sensor in maximum intercuspation position at the two head postures.Results:Data were summarized as mean ± standard error and compared by Student's t-test using SPSS software (windows version 17.0 IBM corporation, New York, USA). A statistically significant correlation between head posture and contact area was found in dentate and denture wearers, i.e., tooth contact area varies with head posture.Conclusion:It was concluded that the occlusal contacts vary at different head posture in dentate as well as in denture wearers. With ventroflexion, the number of tooth contact decreased as compared to upright-erect position in both groups. Clinical implication - since the number of tooth contacts varies with varying head postures, it is recommended that the balancing of the contacts should be done at varying head postures.

Rolling–sliding contact fatigue of surfaces with sinusoidal roughness

Surfaces of mechanical components under combined rolling and sliding motions may be subjected to accelerated contact fatigue failure due to increased number of microscopic stress cycles and pressure peak heights caused by rough-surface asperity contacts. Available rolling contact fatigue (RCF) theories were developed mainly for rolling element bearings, for which the effect of sliding is usually insignificant. In various types of gears, however, considerable sliding exist in the critical tooth contact area below the pitch line, where excessive wear and severe pitting failures originate. Ignorance of sliding is most likely the reason why the conventional RCF models often overestimate gear fatigue life. This paper studies the effect of sliding motion on the contact fatigue life of surfaces with sinusoidal roughness that mimicks the topography from certain manufacturing processes. A set of simple equations for stress cycle counting is derived. Mixed elastohydrodynamic lubrication simulations are executed with the considerations of normal loading and frictional shear. Relative fatigue life evaluations based on a subsurface stress analysis is conducted, taking into account the two sliding-induced mechanisms, which are the greatly increased number of stress cycles and the pressure peak heights due to surface interactions. Obtained results indicate that sliding leads to a significant reduction of contact fatigue life, and rough surface asperity contacts result in accelerated pitting failure that needs to be considered in life predictions for various mechanical components.

Association between balance of masticatory muscle activity during usual daily life and transverse craniofacial morphology or tooth contact area in patients with transverse jaw deformity: An electromyographic evaluation

Introduction: It is considered now-a-days that patients with transverse craniofacial deformity might have differences in masticatory muscle activity between both sides; and as masticatory muscle activity takes place throughout the usual daily life; therefore, it might have some relation with the transverse craniofacial morphology. The present study was carried out to find out any association between balance of masticatory muscle activity during usual daily life and transverse craniofacial morphology or tooth contact area in patients with transverse jaw deformity.Subjects and Methods: All the controls and patients for the study were selected from our staffs and patients coming to Orthodontic Clinic, Hiroshima University Dental Hospital, respectively. Thirteen males and two females (mean and s.d. of ages: 28.6 ± 1.9 years) served as the controls. They had Angle’s Class I molar relationship, no severe malocclusion, no complaints of temporomandibular disorder (TMD).The patient group was consisted of 10 males and five females (mean and s.d. of ages: 19.9 ± 5.3 years) with lateral shift of the mandible. They had malocclusion such as cross-bite and severe crowding, but no complaints of TMD. Portable digital EMG recording device were used to record the EMG from the bilateral masster and anterior temporal muscles. The diurnal recording was carried out for consecutive 142 minutes and divided into two periods of usual daytime and mealtime for analysis. After the diurnal recording, the subjects were allowed to go back home with the electrodes in position and then nocturnal EMG recording was performed again at night with the usual sleeping posture for 142 minutes. Posteroanterior cephalometric analysis and tooth contact area were measured for all the subjects.Result: No significant correlations were found for both the muscles neither with transverse craniofacial morphology nor with the tooth contact area for all the three periods of usual daily life, although a significant correlation was detected between the A-B distance and AI of the anterior temporal muscle during usual daytime.Conclusion: It is suggested that masticatory muscle activity during usual daily life in patients with transverse craniofacial deformity may not be related only to such factors as skeletal deformity or tooth contact area but governed by other important factors like occlusal interference, premature contacts, instability and so on.Ban J Orthod &amp; Dentofac Orthop, October 2012; Vol-3, No.1

The Analysis of Contact Fatigue Behavior in Ni-Base Single Crystal Superalloy Turbine Blade Rabbet

Based on the dislocation pile-up theory and the crystal plastic theory, a rate-dependent crystallographic plastic finite element method (FEM) was used to analyze the stress distribution in the contact zone of single crystal turbine blade rabbet. The FEM results show that the maximum stress and the maximum resolved shear stress location are in the upper edge of the first tooth contact area of the rabbet. The surface crack initiates in the edge and grows as the zigzag wave. The deflected angle of the plane defined by maximum resolved shear stress gradient direction and the upper edge of the first tooth contact area of the rabbet with respect to the Z axis is 35°. The fracture occurs along the {-1-11} plane. Fracture behavior of rabbet/groove modeling specimens made of nickel-based single crystal superalloys was studied by corresponding contact fatigue experiments. The initial place and developing direction of the fatigue crack observed from experiments are found to be in good agreement with the predicted results based FEM.

Finite Element Analysis of Contact Stress in the Meshing Process for Internal Gear Pairs with Few Teeth Difference

The models of finite element analysis are established reasonably after combining the principle of gear engagement, contact mechanics, and finite element concept and method. Simulations are made for the meshing process of the internal gear pairs with few teeth difference using finite element method. Tooth contact area, contact position, and the distribution principles of contact stress along the direction of tooth depth are studied. The main effect factors on the maximum contact stress are analyzed. It is found out that the effect of cusp contact along the tooth profiles may be generated in the meshing process of the internal gear pairs with few teeth difference. The complexity of multi-pair teeth meshing effect during the meshing process is pointed out.

Effect of Stabilization Splint on Occlusal Force Distribution During Voluntary Submaximal Tooth Clenching: A Preliminary Sleep Simulation Study

The purpose of the study was to clarify the effect of a stabilization splint (SS) on the distribution of occlusal force around the dental arch during voluntary submaximal tooth clenching. Ten healthy volunteers participated in this study. For each subject, the maxillary SS was made of heat-cured hard acrylic resin with approximately one mm thickness at the molar regions. The subjects were asked to perform static clenching at either 40% or 80% maximum voluntary contraction (MVC) levels, with and without the SS in place, using visual feedback. The occlusal contact area and occlusal force were analyzed. When the SS was inserted, the mean tooth contact area and occlusal force significantly decreased at both 40% and 80% MVC levels (p<0.01). The location of the occlusal balancing point changed towards the anterior after insertion of the SS. The results suggest that the SS has potential to reduce individual tooth-loading forces by evenly distributing the forces generated during sleep bruxism.

Finite Element Analysis of Flexural Strength for Helical Gear of Automotive Transmission

On the basis of the analysis of special demand of helical gear of automotive transmission, gear precision modeling and finite element analysis of flexural strength were carried out in this paper. In UG three-dimensional modeling environment, helical gear model was generated and imported into ANSYS software through data exchange interface. Then meshed on the geometric model, discussed the tooth contact area and the detrimental loading position, and compared the influence on gear strength with different tooth root fillet radius. The paper provided certain methods to guide the gear parametric design, strength analysis and improving optimization design efficiency of transmission gear parts.