• Journal of Dental Rehabilitation and Applied Science
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• v.34 no.2
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• pp.127-136
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• 2018

The patient who has severely absorbed residual ridges, treatments are challenging to satisfy many factors: support, retention, stability, etc. The neutral zone or monoplane occlusion with non-anatomical tooth would be helpful to get additional retention and stability. The monoplane occlusion has been used long time because it can eliminate horizontal forces and many other advantages. The lingualized occlusion was introduced to improve chewing efficiency and esthetics. But from a stability aspect, it seems controversy between monoplane occlusion and lingualized occlusion. This case report shows the results of the treat two flat residual ridge patients using functional impression; piezography, and made 2 other dentures with monoplane and lingualized occlusion that patient can select denture.

• Imaging Science in Dentistry
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• v.33 no.2
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• pp.85-90
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• 2003

Purpose : To investigate the differences between the position of the mandibular condyles in temporomandibular joints of patients presenting with normal occlusion and skeletal class III malocclusion. Materials and Methods: Forty-two subjects with normal occlusion and thirty-seven subjects exhibiting skeletal class III malocclusion prior to orthodontic treatment were included in the study. Transcranial radiographs of each subject were taken at centric occlusion and 1 inch mouth opening. The positional relationship between the mandibular condyles with articular fossae and articular eminences at two positional states were evaluated and analyzed statistically. Results: The mandibular condyles of the skeletal class III malocclusion group were found to be located more anteriorly from the center of the articular fossae compared to the normal occlusion group in centric occlusion. The mandibular condyles of the skeletal Class III malocclusion group were located more superiorly from the middle of articular height than those of the normal occlusion group in centric occlusion. However, these differences were not statistically significant. At 1 inch mouth opening, the mandibular condyles of the skeletal class III malocclusion group were placed more posteriorly from the articular eminences than those of the normal occlusion group. The mean angle of the articular eminence posterior slope were 56.51 ° ± 6.29° in the normal occlusion group and 60.37° ± 6.26° in the skeletal Class III malocclusion group. Conclusions: The mandibular condyles of the skeletal Class III malocclusion group were placed more anteriorly at centric occlusion and more posteriorly at 1 inch mouth opening when compared with those of the normal occlusion group.

• Proceedings of the KIEE Conference
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• 2004.11c
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• pp.144-146
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• 2004

Stereo image analysis has been an important tool for reconstructing 3D terrain. By In its nature, occlusion is one of difficulties we cannot avoid in stereo matching. This paper presents a study on occlusion detection by employing LRC(Left-Right Check) and OCC(Occlusion Constraint). Experimental results show that these method can effectively detect occluded regions and those regions are usually occurred around object contours and scene discontinuity.

• The Journal of Korean Academy of Prosthodontics
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• v.27 no.2
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• pp.189-200
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• 1989

The purpose of this study was to investigate the muscle activity of the group function occlusion and the changed canine guided occlusion using EM2. In this study, 13 subjects with group function occlusion and without temporomandibular disorders were selected, each subject was changed to the canine guided occlusion by forming the lingual ramps in the upper canines with light curing composite resin. The muscle activities of the anterior temporal and masseter muscle were recorded in the group function occlusion and immediately, one week, and two weeks after changing to the canine guided occlusion under the condition of maximum voluntary clenching in centric occlusion, lateral excursion, and during gum chewing. The results were as follows: 1. In case of maximum voluntary clenching in centric occlusion, the muscle activities of the anterior temporal and masseter muscle of working and balancing side didn't show any difference immediately after changing to the canine guided occlusion, one week after changing to the canine guided occlusion, one week after changing to it the muscle activities of the anterior temporal masseter muscle of working and balancing side were increased significantly, and two weeks after changing to it the muscle activities of the masseter muscle were increased significantly in comparison with the group function occlusion. 2. In case of maximum voluntary clenching in lateral excursion, the muscle activities of the anterior temporal and masseter muscle of working and balancing side were reduced significantly immediately after changing to the canine guided occlusion, one week after changing to it the muscle activities of the anterior temporal muscle of balancing side and of the anterior temporal and masseter muscle of working side were reduced significantly, and 2 weeks after changing to it the muscle activities of the anterior temporal and masseter muscle of working side were reduced significantly in comparison with the .group function occlusion. 3. During gum chewing, the muscle activities of the anterior temporal and masseter muscle of working and balancing side didn't show any difference immediately after changing to the canine guided occlusion, one week after changing to it the muscle activities of the masseter muscle of working and balancing side were increased significantly, and two weeks after changing to it only the muscle activities of masseter muscle of working side were increased significantly.

• Journal of Dental Rehabilitation and Applied Science
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• v.18 no.3
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• pp.185-195
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• 2002

Purpose This article describes the historic and clinical aspects of the determination of the vertical dimension of occlusion and the synoptic procedure of the determination of the vertical dimension of occlusion in complete denture. The determining procedure of the susceptible vertical dimension of occlusion is one of the most important steps in construction of complete denture and prosthodontic treatment. It is considered essential for the improvement and the recovery of facial esthetics and stomatognathic functions. Results Several methods have been suggested for measurement of the vertical dimension of occlusion in the construction of complete denture and the prosthodontic rehabilitation. These range from pre-extraction records to the use of physiologic rest position, swallowing, phonetics, esthetics and facial proportion, etc. But, there is no universally accepted or completely accurate method. There seems to be no significant advantages of one technique other than those of cost, time and equipment requirements, and seems to be in controversial in determining the vertical dimension. Conclusion The vertical dimension of occlusion should be determined and reinspected carefully by dentist for a successful prosthesis with several methods. The more investigations are necessary for more objective and scientific techniques in determining the vertical dimension of occlusion.

• Journal of Dental Rehabilitation and Applied Science
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• v.20 no.1
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• pp.57-70
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• 2004

The significance of occlusion has regained its popularity in dentistry with the introduction of implant therapy. Literature has reported that the clinical success and longevity of dental implants can be achieved by biomechanically controlled occlusion. Occlusal overload is known to be one of the main causes for implant failure. Evidences have suggested that occlusal overload contribute to early implant bone loss as well as deosseointegration of successfully integrated implants. Unlike natural teeth, osseointegrated implants are ankylosed to surrounding bone without the periodontal ligament (PDL) which provides mechanoreceptors as well as shock-absorbing function. Moreover, the crestal bone around dental implants may act as a fulcrum point for lever action when a force (bending moment) is applied, indicating that implants/implant prosthesis could be more susceptible to crestal bone loss by applying force. Hence, it is essential for clinicians to understand inherent differences between teeth and implants and how force, either normal or excessive force, may influence on implants under occlusal loading. The purposes of this paper are to review the importance of implant occlusion, to establish the optimum implant occlusion with biomechanical rationale, to provide clinical guidelines of implant occlusion and to discuss how to manage complications related to implant occlusion.

• The korean journal of orthodontics
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• v.8 no.1
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• pp.59-71
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• 1978

The author compared and analysed the roentgenocephalograms of one hundred Korean adults with the normal occlusion (50 males and 50 females), which were taken on the centric occlusion and the rest position of the mandible respectively for every subject, and then researched the relations among the relaxed muscle of the mandible, lightly touched of the lips, and the position just after the swallowing of saliva, of which 38 among 50 males had the rest position of the mandible. The results are as followings: 1. The anterior facial height increases more at the rest position of the mandible than at the centric occlusion, while the posterior facial height decreases. 2. The mandible moves more backward and downward at the rest position of the mandible than at the centric occlusion. 3. The facial procumbency and the incisor tooth inclination increases more at the rest position of the mandible than the centric occlusion in terms of the facial plane. 4. There are no differences between males and females at the rest position of the mandible and the centric occlusion in the meaning of variation. 5. There are no differences among the three methods from the view of lines and angles of the roentgenocephalogram.

• The Journal of the Korean dental association
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• v.58 no.8
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• pp.496-504
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• 2020

The osseointegrated implants react biomechanically in a different pattern to occlusal force, due to lack of the periodontal ligament unlike the natural teeth. The implants show markedly less movement and limited tactile sensitivity compared with the natural teeth. The implant occlusion concept aims to avoid overloading on the implants and to direct occlusal loads along the longitudinal axis of the implants, in order to compensate for the different biomechanics of the implants. Although many guidelines and theories on implant occlusion have been proposed, few have provided strong supportive evidence. Moreover, the outcome of treatment often quite successful in spite of different concepts of occlusion and there is an increasing tendency to doubt about the strict theoretical implant-specific occlusion concept. The purpose of this article is to review the previous reports about the concept of implant occlusion and discuss clinical occlusal considerations in implant rehabilitations.

• Journal of the Ergonomics Society of Korea
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• v.28 no.3
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• pp.49-54
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• 2009

Visual occlusion method is a visual demand measuring technique which uses periodic vision/occlusion cycle to simulate driving environment. It became one of the most popular techniques for the evaluation of in-vehicle interfaces due to its robustness and cost-effectiveness. However, it has a limitation in that the vision/occlusion cycle forces the user to use the IVIS at a predetermined pace, while a driver decides when to use the device on his/her own in actual driving. This paper proposes a user-driven visual occlusion method for measuring the visual demand of in-vehicle interfaces. An experiment was conducted to examine the visual demand of an in-vehicle interface prototype using both the existing (system-driven) occlusion method and the proposed (user-driven) one. Two in-vehicle tasks were evaluated: address input and radio tuning. The results showed that, for the radio tuning task, there were significant differences in total shutter open time and resumability ratio between the methods. The user-driven visual occlusion method not only allows a better representation of drivers' behavior, but it also seems to provide more information on the chunkability of a task.

• Journal of Korean Academy of Dental Administration
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• v.9 no.1
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• pp.7-13
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• 2021

The present randomized controlled trial aimed to evaluate changes in occlusion of indirect restorations before and after attachment using resin cement according to universal adhesives. This study included patients who underwent indirect restoration treatment at the Yonsei University Dental Hospital between April and October 2016. Universal adhesives requiring light curing and those not requiring light curing were used in this study. Changes in occlusion before and after adhesion of the indirect restoration were evaluated using articulating paper and shimstock as well as through the discomfort felt by the patients. To analyze the differences between the universal adhesive, Fisher's exact tests were performed using SPSS ver. 22.0 software. Of the 39 cases of indirect restoration, 29 were included in the study. A change in occlusion after adhesion of the indirect restoration was observed in only one case of universal adhesive that required light curing. The patient felt that the occlusion increased after the attachment of the restoration, and it was observed that the occlusion point was different from that before attachment. However, the results of the analysis were not statistically significant. Based on the findings, the universal adhesives did not affect the occlusion before and after indirect adhesion restoration using RelyX Ultimate.