Academic literature on the topic 'Occlusal forces'
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Journal articles on the topic "Occlusal forces"
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Lazic, Vojkan, and Slavoljub Zivkovic. "T-scan II occlusal analysis in restorative dentistry." Serbian Dental Journal 49, no. 3-4 (2002): 110–13. http://dx.doi.org/10.2298/sgs0204110l.
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The comparison of accufilm markings and computerized T-Scan II force plots of restorations and occlusal interferences in intercuspal position of the lower jaw, before and after occlusal adjustment showed a great improvement in force distribution, balance of occlusal forces and evenness of the right and left side. The computer analysis through T-Scan II system help us to clearly understand what those well balanced occlusal contacts and force distribution really mean for the proper restorative occlusal therapy.
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Bozhkova, Tanya P. "The T-SCAN System in Evaluating Occlusal Contacts." Folia Medica 58, no. 2 (June 1, 2016): 122–30. http://dx.doi.org/10.1515/folmed-2016-0015.
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AbstractBackground: Normal occlusal and articulation relations between the jaws ensure equal distribution of occlusal forces during mastication. A T-SCAN system allows these relations to be measured dynamically during the articulation cycle.Aim: To evaluate the T-SCAN III system in measuring and assessing the forces of occlusal contacts and their digital presentation.Patients and methods: Thirty students aged 19 - 22 years were examined. Of these only one matched the study criteria:- intact dentition;- without or with class I fillings in teeth 36 or 46;- Angle’s class I jaw relationWe used a computerized occlusal analysis system T-SCAN in the study. It comes with a registering sensor for the occlusal contacts, a module for transmitting the signals to a computer, and conversion software to generate images on a computer screen.Results: We evaluated the system’s capabilities in registering the occlusal contacts during mastication on an occlusion film and the occlusal forces using a digital display.Conclusion: The T-SCAN system provides the only accurate way to determine and evaluate the time sequence and force of occlusal contacts by converting the qualitative data into quantitative and displaying them digitally.
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Thein, Moe Win, Yoichiro Seki, and Yukihiro Fujita. "The effect of premolar occlusal contact on the occlusal forces." Journal of Japanese Society of Stomatognathic Function 8, no. 2 (2002): 117–23. http://dx.doi.org/10.7144/sgf.8.117.
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Uzuner, Fatma Deniz, Hande Odabasi, Secil Acar, Tuba Tortop, and Nilufer Darendeliler. "Evaluation of the effects of modified bonded rapid maxillary expansion on occlusal force distribution: A pilot study." European Journal of Dentistry 10, no. 01 (January 2016): 103–8. http://dx.doi.org/10.4103/1305-7456.175695.
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ABSTRACT Objective: To evaluate the effects of modified bonded rapid maxillary expansion (RME) on occlusal force distribution. Materials and Methods: The sample included 12 patients (7 girls and 5 boys; mean age: 13.1 years) at the permanent dentition stage with bilateral posterior cross-bite. The patients were treated with a modified bonded RME appliance, activated twice a day. The study was terminated when the palatal cusps of the maxillary posterior teeth were occluding with the buccal cusps of the mandibular posterior teeth. The postretention period was 3 months. The T-Scan III device was used to analyze the percentages of occlusal force distribution, and records were taken at the pretreatment (T1), the postreatment (T2), and the postretention (T3) periods. Wilcoxon signed rank test was used for statistical analyses. Results: Incisors were most frequently without contact, followed by canines. The highest forces were seen in the second and first molar regions. A significant decrease was seen in total occlusal force during treatment (T1–T2); however, during retention, the force returned to its initial value, and no significant differences were found (T1–T3). No differences were found between right and left sides and in occlusal forces of the teeth in all time periods. Conclusion: The use of modified bonded RME decreases the total occlusal forces during the treatment period, but it does returns to its initial value after the postretention period.
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Beninati, Christopher J., and Thomas R. Katona. "The combined effects of salivas and occlusal indicators on occlusal contact forces." Journal of Oral Rehabilitation 46, no. 5 (February 14, 2019): 468–74. http://dx.doi.org/10.1111/joor.12772.
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McCrea, E. S., T. R. Katona, and G. J. Eckert. "The effects of salivas on occlusal forces." Journal of Oral Rehabilitation 42, no. 5 (December 8, 2014): 348–54. http://dx.doi.org/10.1111/joor.12260.
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Rajendran, Maheaswari, A. Mahalakshmi, A. Selvam, and R. Usha. "Interplay of occlusal forces and the periodontium." international journal of stomatology & occlusion medicine 8, S1 (May 3, 2016): 17–24. http://dx.doi.org/10.1007/s12548-016-0146-x.
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Lazic, Vojkan, Aleksandar Todorovic, Slavoljub Zivkovic, and Zeljko Martinovic. "Computerized occlusal analysis in bruxism." Srpski arhiv za celokupno lekarstvo 134, no. 1-2 (2006): 22–29. http://dx.doi.org/10.2298/sarh0602022l.
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Introduction. Sleep bruxism as nocturnal parafunction, also known as tooth grinding, is the most common parasomnia (sleep disorder). Most tooth grinding occurs during rapid eye movement - REM sleep. Sleep bruxism is an oral habit characterized by rhythmic activity of the masticatory muscles (m. masseter) that causes forced contact between dental surfaces during sleep. Sleep bruxism has been associated with craniomandibular disorders including temporomandibular joint discomfort, pulpalgia, premature loss of teeth due to excessive attrition and mobility, headache, muscle ache, sleep interruption of an individual and problems with removable and fixed denture. Basically, two groups of etiological factors can be distinguished, viz., peripheral (occlusal) factors and central (pathophysiological and psychological) factors. The role of occlusion (occlusal discrepancies) as the causative factor is not enough mentioned in relation to bruxism. Objective. The main objective of this paper was to evaluate the connection between occlusal factors and nocturnal parafunctional activities (occlusal disharmonies and bruxism). Method. Two groups were formed- experimental of 15 persons with signs and symptoms of nocturnal parafunctional activity of mandible (mean age 26.6 years) and control of 42 persons with no signs and symptoms of bruxism (mean age 26.3 yrs.). The computerized occlusal analyses were performed using the T-Scan II system (Tekscan, Boston, USA). 2D occlusograms were analyzed showing the occlusal force, the center of the occlusal force with the trajectory and the number of antagonistic tooth contacts. Results. Statistically significant difference of force distribution was found between the left and the right side of the arch (L%-R%) (t=2.773; p<0.02) in the group with bruxism. The difference of the centre of occlusal force - COF trajectory between the experimental and control group was not significant, but the trajectory of COF was longer in the group of bruxists (67.3?24.4mm). In addition, the significant difference of COF position in relation to the center of the elliptic fields was not found in bruxists (?2=1.63; p> 0.05), but obtained results directly revealed uneven distribution of the occlusal forces which caused the excessive attrition and mobility of tooth. Conclusion. Our study failed to find direct correlation between occlusal factors and bruxism, so they are basically contributing factors.
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Cho, Young-Eun, Eun-Jin Park, Jai-Young Koak, Seong-Kyun Kim, Seong-Joo Heo, and Ji-Man Park. "Strain Gauge Analysis of Occlusal Forces on Implant Prostheses at Various Occlusal Heights." International Journal of Oral & Maxillofacial Implants 29, no. 5 (September 19, 2014): 1034–41. http://dx.doi.org/10.11607/jomi.3040.
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Fan, Jingyuan, and Jack G. Caton. "Occlusal trauma and excessive occlusal forces: Narrative review, case definitions, and diagnostic considerations." Journal of Periodontology 89 (June 2018): S214—S222. http://dx.doi.org/10.1002/jper.16-0581.
Full textDissertations / Theses on the topic "Occlusal forces"
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Akeel, Riyadh Fadul. "The dynamic recording of occlusal forces related to mandibular movement and masseter muscle activity in implant stabilised overdenture wearers." Thesis, Queen Mary, University of London, 1994. http://qmro.qmul.ac.uk/xmlui/handle/123456789/1339.
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The initial phase of this study was to develop a force transducer to investigate occlusal forces during the process of mastication. The strain gauge transducer was designed to attach to an Astra implant. A commercial pressure transducer was also used under one distal saddle of the denture. The calibration method was designed to record unilateral masticatory forces regardless of the site of loading. Five edentulous subjects with implant stabilised mandibular overdentures and maxillary complete dentures were selected for the study. Mandibular movements and unilateral Masseter muscle EMG were recorded. Experiments were designed to establish within subject differences related to cycle type, food type, EMG-force relationship, chewing side and cycle phase. Maximum biting force on a bite gauge and in the intercuspal position were also recorded. Details of force production during the closing and occlusal phases improved the description of the movement cycle and it's relationship to food breakdown. A classification of chewing cycles is proposed based on the force exerted in the closing and occlusal phases. This provides objective criteria for separating crushing, reduction and mush cycles. Peak forces varied between subjects, but are characteristic for the type of food within subjects. The different strategies used by subjects appeared to be partly related to the force capacity of the individual. The duration of force in the closing phase was related to the stage in the chewing sequence and indicated the degree of bolus resistance. A longer force duration in the closing phase was usually accompanied by a shorter occlusal duration and consequently an early occurrence of force peak relative to occlusion. The progressive change of jaw gap at the beginning of force was consistent with the expected reduction of particles through the masticatory sequence. The jaw gape at maximum velocity correlated with maximum jaw gape but both did not decrease progressively 2 Abstract through chewing sequences. Conversely, the jaw gape at which force exceeded 5N showed patterns of progressive decrease especially with frangible foods. Integrated force and Emg showed high correlations during mastication, better than peak values. These correlations were, however, weaker than those found in static unilateral biting. The slope difference found between the two conditions contraindicate the use of Emg activity in static unilateral biting as an index for measuring masticatory forces. This study has, thus, validated a method for investigating masticatory forces and shown their value for analysis of dynamic aspects of the loads that occurs during mastication.
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Ré, Jean-Philippe. "Variabilité diachronique de la courbe de Spee : exemples d'applications à l'anthropologie funéraire et à l'odontologie clinique." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM5050.
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La courbe de Spee est une courbe située dans un plan para-sagittal. Son étude se fait uniquement au niveau des dents mandibulaires. Il ne s’agit pas d’un « simple » plan d’occlusion dentaire puisque cette courbe intéresse, également de l’os, c’est à dire le condyle mandibulaire et plus particulièrement son bord antérieur. La courbe de Spee est dépendante de l’emplacement du condyle mais également de l’axe de chacune des dents mandibulaires qui participent à sa forme. Son incurvation permet d’aligner les directions des contraintes le long des grands axes dentaires. À partir des valeurs métriques et angulaires mesurées sur des images 3D de mandibules numérisées les objectifs ont été : - de proposer une aide dans la reconstruction de mandibule incomplète et/ou déformée et du plan occlusal absent ou incomplet. - de dégager des principes géométriques simples permettant une optimisation du positionnement des racines artificielles (implants) chez l’Homme actuel. Ainsi les études des axes dentaires mandibulaires, de la position du condyle mandibulaire, de la courbe de Spee, ou encore de différentes mesures mandibulaires, ont permis de dégager un axe de recherche anthropologique et un axe de recherche odontologique Un axe anthropologique Qui amène à la découverte validée de formules de régressions pouvant apporter une aide dans la reconstructions de matériel dentaire, ou osseux incomplet, mandibulaire. Un axe odontologique Qui confirme, et valide cliniquement, que les axes dentaires mandibulaires doivent être orientés le plus favorablement possible en fonction des diverses contraintes occlusalesThe curve of Spee is situated in a para-sagittal plane. His study is done only at the mandibular teeth. It is not a "simple" plan of dental occlusion because this curve interests, also of bone, the mandibular condyle and particularly its front edge. The curve of Spee depends on the condyle location but also on the axis of each of the mandibular teeth which participate in its shape. Its curve aligns the directions of the constraints along major dental axes. From metrics and angular values measured on 3D images of scanned mandibles, the objectives were: - To propose a help in the reconstruction of incomplete and / or deformed mandible and absent or incomplete occlusal plane. - To identify simple geometric principles to optimize the positioning of the artificial roots (implants) in modern Man. So the studies of mandibular dental axes, the position of the mandibular condyle, the curve of Spee, or differents mandibular measures allowed to clear an area of anthropological research and an area of Dental Research An anthropological area Which leads to the validated discovery regression formulas, which can brings help in reconstruction of dental material, or osseous incomplete, mandibular. An odontological area Which confirms and validates clinically, that the mandibular dental axes must be oriented as favorably as possible according to the various occlusal constraints
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Dawjee, Maryam Mohamed. "Occlusal bite force measurements in different malocclusions." Diss., University of Pretoria, 2014. http://hdl.handle.net/2263/46126.
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Dento-facial anomalies have been diagnosed for centuries. The
diagnosis or observation thereof is reported to date back to the Fifth
Century AD where Hippocrates observed and noted numerous
craniofacial deformities (Moyers, 1988)
Through a complex process of reception, selection and categorizationthe
human form particularly the cranium, jaws and related soft tissue
structures, have been studied and categorized over the years (Moyers,
1988). Dockrell (1952) focused on the aetiology of malocclusion and
through extensive work on the topic, established an equation for the
improved identification of aetiology of malocclusion. This equation
essentially communicates that a causative factor will act at a specified
time, on an identified tissue, to produce particular results. Thus
resulting in a deviation from the accepted “normal” relationship. This
will result in the development of an archetypally defined, classifiable
malocclusion. These so termed causative factors as elicited to in the
equation play a pivotal role in the outcomes or resultant malocclusions
(Dockrell, 1952). The plasticity in aetiology and resultant Skeletal or dental positional
discrepancy should not be overlooked. Multiple factors may act together
stabilising each other thus lessening the severity of the expected effect.
This research project aims to identify the potential of occlusal bite forces
as a causative factor in the “orthodontic equation” and shed light on
timing as well as resulting Skeletal and growth effects of variance in
occlusal force. Occlusal force is a combined and quantifiable
measurement of contributory muscle strength.
Through this study a comparative analysis of the occlusal force will be
carried out amongst subjects exhibiting differences in age, gender, race,
and growth pattern. This study aims to elucidate the influence of
occlusal forces and masticatory muscle strength in relation to the
resulting craniofacial development.
Data was collected from patients exhibiting various dental classes
namely Class I, Class II and Class III dental and Skeletal patterns. Bite
force strength of patients in primary, mixed and permanent dentition
was measured using an occlusal force meter. The occlusal force meter
was sourced from a Japanese based company, Nagano Keiki Co. LTD.
The readings were done in Kilo newton, which is the standard
international (SI) measurement of force.
The study population consisted of 180 male and 180 female subjects. This group was split into Skeletal Class I, II and III subjects and then
further divided into the three directions of growth (Horizontal, normal
and Vertical).
The relationship of bite force to Skeletal Class and growth direction was
analysed using mean readings from five points of reference on each
subject. Analysis of covariance was carried out on the data set with a
mean age of 15,33 years (covariant). There was a significant difference
found in the bite forces between growth direction and Skeletal Class
P<0,05. There was also and interaction found between Skeletal classes
and direction of growth. These findings are supportive to the hypothesis
that a relationship exists between bite force and malocclusion.Dissertation (MSc (Odont))--University of Pretoria, 2014.
tm2015
Community Dentistry
MScOdont
Unrestricted
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Alkhaiat, Reem, and Zahra Jaber. "Maximal voluntary occlusal bite force in young adult men -a pilot study." Thesis, Umeå universitet, Institutionen för odontologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-178782.
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Background: Maximal voluntary occlusal bite force (MVOBF) is the maximal force applied by the jaw muscles in dental occlusion. MVOBF is one parameter for functional capacity of the jaw system. Aim: To evaluate MVOBF in different positions in the bite and to evaluate possible intra-individual differences between sessions. Methods: MVOBF was measured with an electronic bite force device, with transducers sensitive to force, in 20 healthy men (mean 24.5 years). Eligibility of participants was full dental occlusion, Angle Class I relation, no diagnosis according to Diagnostic criteria for temporomandibular disorders. The test included three repeated measurements on each site: first molar right, first molar left and central incisor, in random order, with test-retest study design. Unpaired T-test was used to test the MVOBF in different positions in the bite and paired T-test for possible intra-individual differences between sessions. A post hoc test for repeated measure one-way ANOVA was added. Results: MVOBF in different positions in the bite was lower in the incisor area compared with the molar region (P<0.0001), but similar between right and left molar side (P=0.48 and P= 0.96, respectively). No intra-individual differences between sessions (molar right P= 0.40; molar left P= 0.81; incisor area P= 0.66). The intra-individual variability for repeated measurements showed variability for incisor area (P= 0.007), but not for molar right and left region (P=0.95 and P=0.49, respectively). Conclusion: The results may provide reference values for MVOBF in young adult men, to be compared with men with pain or dysfunction in the jaw system.
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Brondeau, François de. "Mise au point d'un capteur piézoélectrique (PVF2) pour l'enregistrement des forces occlusales." Bordeaux 2, 1991. http://www.theses.fr/1991BOR2OM02.
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Chouraqui, Alfred. "Etude analytique en photoelasticimetrie d'une bioforme tridimensionnelle cylindro-circulaire differentielle et comparaison avec deux autres bioformes classiques." Nice, 1990. http://www.theses.fr/1990NICE7501.
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Lautrou, Alain. "Effets directionnels d'une force extra-orale appliquée sur un activateur en hyperpropulsion." Paris 5, 1993. http://www.theses.fr/1993PA05M015.
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Dheyriat, Alain. "Etude de l'appareil manducateur par l'utilisation de jauges de deformation associees a la spectroscopie et a l'imagerie par resonance magnetique nucleaire." Lyon 1, 1996. http://www.theses.fr/1996LYO1U247.
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Ginot, Samuel. "Morpho-anatomie crânienne chez les rongeurs murinés : aspects fonctionnels, génétiques et écologiques." Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTT152/document.
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Cette thèse porte sur l'anatomie et la morphologie du complexe crânien chez les murinés. Ses objectifs sont de démontrer et de décrire le lien morpho-fonctionnel entre le crâne et la force de morsure, représentant la performance, d'identifier les sources génétiques de la variation de la performance et de la morphologie, et de comprendre comment la variation morpho-fonctionnelle dépend du mode de vie d'une espèce.La première partie décrit l'anatomie de l'appareil masticateur dans le genre Mus. Des différences fonctionnelles et liées au régime alimentaire sont montrées. Puis, on s'intéresse au lien entre morphologie et fonction, et aux proxies morpho-anatomiques permettant d'estimer la force de morsure. Un modèle biomécanique des muscles masticateurs est d'abord utilisé. Les estimations obtenues sontproches des mesures in vivo au niveau interspécifique, mais moins précises au niveau intraspécifique.L'avantage mécanique et la forme de la mandibule sont ensuite utilisés comme proxies. La force de morsure estimée et réelle sont corrélées au niveau interspécifique, mais moins au niveau intraspécifique, avec des différences selon les espèces. Pour expliquer ces imprécisions, la variation ontogénétique de la force de morsure et de la forme de la mandibule sont décrites. Lorsque l'âge est contrôlé, le développement osseux ralentit plus tôt que celui de la force de morsure, ce qui peut expliquer les biais trouvés dans les estimations de la force de morsure.La deuxième partie se concentre sur les sources génétiques des variations morpho-fonctionnelles. Chez Mus minutoides, des changements sur les chromosomes sexuels produisent des différences de taille et de force de morsure. Les mâles féminisés de cette espèces sont plus agressifs que les autres individus, et montrent une force de morsure plus puissante, principalement grâce à unplus gros crâne. Le(s) gène(s) féminisant produis(ent) donc des changements à l'échelle de l'organisme tout entier. La section suivante s'intéresse aux liens entre consanguinité, asymétrie et performance chez la souris domestique. Les souris les plus consanguines ne montrent pas d'augmentation de l'asymétrie de leurs mandibules, et la performance des souris les plus consanguines ou les plus asymétriques n'est pas affectée. Enfin, l'héritabilité de la force de morsure et de la morphologie est estimée. La force de morsure in vivo n'est pas héritable, bien que la morphologie le soit. Etant donné le lien entre morpho-anatomie et force de morsure, ces résultats suggèrent que les changements morphologiques sont des voies de moindre résistance évolutive, et qu'ils peuvent être à l'origine de changements de performance.La dernière partie utilise la morphologie et la performance en tant que caractères liés à l'écologie des espèces. La première section s'intéresse aux différences de performance entre Apodemus sylvaticus et Mus spretus, qui partagent leur habitat et leurs ressources alimentaires, malgré une différence de taille marquée. Nos résultats montrent un recouvrement des distributions des forces de morsures, soutenant l'hypothèse d'un régime alimentaire commun. Cette coexistence pourrait être due à une abondance de ressources là où ces espèces sont syntopiques. Enfin, la variation morphologique est quantifiée chez plusieurs murinés d'Asie du Sud-Est. Les espèces de rats commensaux et généralistes sont moins variables que les autres espèces. Les espèces synanthropiques montrent des réponses morpho-fonctionnelles convergentes entre localités qui suggèrent qu'elles partagent des patrons communs de réponse et donc qu’elles peuvent s'adapter aux variations environnementales régionales induites par l’homme. L'approche utilisée dans cette thèse nous a permis de montrer le lien entre variation génétique,phénotypique et écologique. Ce lien parfois difficile à décrire, est cependant à la base de l'apparition de nouvelles formes et espèces, et constitue un aspect crucial de la biologie de l'évolutionThe theme of this thesis is the anatomy and morphology of the cranio-mandibular complexin various species of murine rodents. The main objectives are to describe the morpho-functional link between the skull and bite force as a measure of performance, to identify the genetic sources of morphological and performance variation, and finally to understand how morpho-functional variation depends on a species diet and lifestyle. The first part describes the anatomy of the masticatory apparatus in the genus Mus. Differences were found, which could be interpreted functionally and linked to variation in diets. The first part also investigates the links between morpho-anatomy and function, and various morphological proxies used for estimating bite force. This is done by building a biomechanical model of masticatory muscles. The bite force estimates obtained match the in vivo measurements at the inter-specific level, but are less precise at the intra-specific level. Then, two osseous mandibular proxies of bite force are compared (lever arms and their mechanical advantage, and its shape data). In vivo and estimated bite force werewell related at the inter-specific level, but less at the intra-specific level, depending on the species. To explain these imprecisions, the ontogenetic variation of bite force and mandibular morphology isdescribed. Under controlled age, the bony development is slowing down earlier than bite force, whichcan partly explain the inconsistencies of estimated bite force.The second part focuses on the genetics of morphological and functional variation. In Musminutoides, changes in the sexual chromosomes entail size and performance changes. The feminized males found in this species are known to be more aggressive than other individuals, and they produce ahigher bite force, mainly due to an increase in skull size. The feminizing gene(s) therefore drive whole-organism-scale changes. Then, the links between inbreeding, asymmetry and performance areinvestigated in the house mouse. The most inbred mice do not experience an increase in the asymmetry of their mandibles. Contrary to expectations, the performance of the most inbred or most asymmetric mice do not decrease and differences in asymmetry levels have no influence on biting performance.The last section estimates the heritabilities of bite force and morphology. In vivo bite force is notheritable, but some morphological characters are. Given the functional link between morpho-anatomyand bite force shown in the first part, these results suggest that morphological changes represente volutionary pathways of least resistance, and drive changes in performance rather than behavioral or related traits.The last part took morphology and performance as linked to a species' niche. The first sectionexplores the differences between Apodemus sylvaticus and Mus spretus. Both share their habitat and food resources, in spite of a marked size difference. Results show great overlap between their bite force distributions supporting the hypothesis of a shared diet. The absence of shift in a trait related toresource use may be due to a large abundance of the food resources where both species are found insyntopy. In the final section the morphological variation in several rodents from Southeast Asia wasquantified. Less morphological variability is found in generalist and commensal rats by comparison toother species. At the community level, synanthropic species show frequent convergent responsesbetween localities in terms of bite force and morphology. These common patterns in response suggestthat synanthropic species tend to be very adaptable to regional environmental differences.The approaches used in this thesis enable us to show the link between genetic, phenotypic andecological variation. This link, sometimes difficult to describe, is nevertheless at the root of theappearance of new forms and species, and constitutes a crucial aspect of evolutionary biology
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Anhesini, Brunna Haddad. "Qualidade marginal de restaurações cervicais, feitas com materiais de diferentes módulos de elasticidade, em pré-molares submetidos a carregamento oclusal excêntrico." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/23/23134/tde-22092016-150245/.
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Os materiais restauradores utilizados na região cervical dos dentes podem ser afetados por resultantes de forças oclusais excêntricas, que já podem ter contribuído à formação da lesão, e deveriam ser capazes de resistir às tensões. Não há consenso, porém, quanto ao papel de diferentes materiais, quiçá especialmente no tocante a seus módulos de elasticidade, no sucesso das respectivas restaurações. Avaliou-se, pois, a influência do uso desses materiais, com módulos de elasticidade (E) distintos em essência, e da associação entre eles, na qualidade marginal de restaurações cervicais em pré-molares submetidos a carregamento oclusal excêntrico. Cavidades cervicais em forma de cunha, preparadas em pré-molares unirradiculares superiores humanos, hígidos e extraídos, foram restauradas com uma resina composta (RC: Z250 XT, n=20); com a resina em associação a um ionômero modificado por resina para forramento (Mista/M: Vitrebond, n=20); ou com um ionômero modificado por resina para restauração (CIV: Vitremer, n=20). Metade dos dentes de cada grupo foi submetida a carregamento oclusal excêntrico (coe: inclusão em resina acrílica e ligamento periodontal artificial, 150 N, 106 ciclos, 2,5 Hz), e a outra metade, apenas armazenada por período de tempo equivalente (Controle/c: água destilada, 37º C). Um sistema adesivo marcado por fluoresceína foi utilizado para delimitação dos defeitos formados, que foram avaliados por meio de Microscopia Confocal de Varredura a Laser. Para a presença ou ausência de fendas marginais aplicou-se, num contexto geral, para cada fator em estudo (carregamento oclusal excêntrico - coe / c; material restaurador - RC / M / CIV), o teste do qui-quadrado (?=0,05). Em específico, aplicaram-se, individualmente, em cada nível do fator carregamento oclusal excêntrico, e em cada nível do fator material restaurador, respectivamente, o teste do qui-quadrado e o teste exato de Fisher (?=0,05). Para a localização das fendas em relação às paredes cavitárias (O: oclusal / C: cervical / OC: ambas) aplicou-se, para cada fator em estudo, o teste do qui-quadrado (?=0,05). O teste de Mann-Whitney foi aplicado para a largura e a profundidade das fendas marginais, para comparar os diferentes níveis do fator carregamento oclusal excêntrico, e o teste de Kruskal-Wallis, para comparar os diferentes níveis do fator material restaurador (?=0,05). Numa conjuntura abrangente, nenhum dos fatores associou-se significativamente com as variáveis de resposta qualitativas nominais ou exerceu influência sobre as quantitativas. Mais especificamente, por exclusivo quando da aplicação do carregamento oclusal excêntrico, o uso dos diferentes materiais restauradores associou-se significativamente com a frequência de fendas marginais (RC>M>CIV). Ainda que a qualidade marginal de restaurações cervicais possa não ser influenciada, de maneira geral, pelo carregamento oclusal ou pelo uso de diferentes materiais, inclusive em associação, o aspecto desfavorável do emprego da resina composta pode tornar-se relevante, em particular, quando da existência de carga oclusal excêntrica.Restorative materials used in the cervical region of teeth may be impacted by resultants of eccentric occlusal loads that have already contributed to the formation of the lesion, and should be capable of withstanding the stresses. There is no consensus, however, about the role of different materials, maybe especially regarding their moduli of elasticity, in the success of respective restorations. The influence of the use of these materials, with different moduli of elasticity (E) in essence, and of their association, on marginal quality of cervical restorations in premolars subjected to eccentric occlusal loading was evaluated thus. Cervical wedge-shaped cavities, prepared in human upper single-rooted premolars, healthy and extracted, were restored with a resin composite (RC: Z250 XT, n=20); with the composite in combination with a resin-modified lining ionomer (Mixed/M: Vitrebond, n=20), or with a resin-modified restorative ionomer (GIC: Vitremer, n=20). Half of the teeth of each group was subjected to eccentric occlusal loading (eol: embedment in acrylic resin, artificial periodontal ligament, 150 N, 106 cycles, 2.5 Hz), and the other, only stored for an equivalent period of time (Control/c: distilled water, 37°C). A fluorescein-marked adhesive system was used for delimitation of formed defects, which were evaluated by means of Laser Scanning Confocal Microscopy. For the presence or absence of marginal gaps, in a general context and for each factor under study (eccentric occlusal loading - eol / c; restorative material - RC / M / GIC), chi-square test was applied (?=0.05). In specific, individually, at each level of the factor eccentric occlusal loading, and at each level of the factor restorative material, chi-square test and Fisher\'s exact test were respectively applied (?=0.05). For the location of the gaps in relation to the cavity walls (O: occlusal / C: cervical / OC: both), for each factor under study, chi-square test was applied (?=0.05). The Mann-Whitney test was applied to the width and depth of marginal gaps, to compare the different levels of the factor eccentric occlusal loading, and the Kruskal-Wallis test, to compare the different levels of the factor restorative material (?=0.05). In a comprehensive view, none of the factors was significantly associated with qualitative response variables or wielded any influence on the quantitative ones. More specifically, for exclusive when eccentric occlusal loading was applied, the use of the different restorative materials was significantly associated with the frequency of marginal gaps (RC>M>GIC). Though marginal quality of cervical restorations may not be in general influenced by the occlusal loading or the use of different materials, even in association, the unfavorable aspect of the use of the resin composite may become relevant particularly in face of the existence of eccentric occlusal load.
Book chapters on the topic "Occlusal forces"
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Koirala, Sushil. "Digital Occlusal Analysis and Force Finishing." In Digitization in Dentistry, 223–57. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-65169-5_8.
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Koos, DMD, Bernd. "Precision and Reliability of the T-Scan III System." In Advances in Medical Technologies and Clinical Practice, 100–128. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-5225-9254-9.ch003.
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Precise analysis of occlusal contacts and occlusal force is a problem in functional diagnostics that has not yet been satisfactorily resolved, despite the fact that the deleterious consequences of an unbalanced occlusion are widespread, and can be severe. In clinical practice, the present-day analysis of the occlusion is reduced to depicting force with color-marking foils that leave ink marks upon the teeth. However, these foils only indicate the localization of contacts, but do not describe reliably the occlusal force relationships. Precise analysis that incorporates time resolution, and plots the distribution of forces within the occlusion, is not possible when employing the traditional occlusal indicator methods. A detailed occlusal force and timing analysis can only be provided by performing a computer-assisted analysis, using the T-Scan III system (Tekscan, Inc. S. Boston, MA, USA), which records changing relative occlusal force levels and real-time occlusal contact sequence data, with high definition (HD) recording sensors. The following chapter demonstrates the accuracy and reliability of this computer-based occlusal measurement method that reliably describes the time-dependent distribution of occlusal force evolution.
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Koos, Bernd. "Precision and Reliability of the T-Scan III System." In Medical Imaging, 846–75. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-0571-6.ch035.
Full textAbstract:
Precise analysis of occlusal contacts and occlusal force is a problem in functional diagnostics that has not yet been satisfactorily resolved, despite the fact that the deleterious consequences of an unbalanced occlusion are widespread and can be severe. In clinical practice, the present-day analysis of the occlusion is reduced to depicting force with color-marking foils that leave ink marks upon the teeth. However, these foils only indicate the localization of contacts, but do not describe reliably the occlusal force relationships. Precise analysis that incorporates time resolution and plots the distribution of forces within the occlusion is not possible when employing the traditional occlusal indicator methods. A detailed occlusal force and timing analysis can only be provided by performing a computer-assisted analysis, using the T-Scan III system (Tekscan, Inc. S. Boston, MA, USA), which records changing relative occlusal force levels and real-time occlusal contact sequence data with High Definition (HD) recording sensors. This chapter demonstrates the accuracy and reliability of this computer-based occlusal measurement method that reliably describes the time-dependent distribution of occlusal force evolution.
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Koos, Bernd. "Precision and Reliability of the T-Scan III System." In Handbook of Research on Computerized Occlusal Analysis Technology Applications in Dental Medicine, 65–93. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-6587-3.ch003.
Full textAbstract:
Precise analysis of occlusal contacts and occlusal force is a problem in functional diagnostics that has not yet been satisfactorily resolved, despite the fact that the deleterious consequences of an unbalanced occlusion are widespread and can be severe. In clinical practice, the present-day analysis of the occlusion is reduced to depicting force with color-marking foils that leave ink marks upon the teeth. However, these foils only indicate the localization of contacts, but do not describe reliably the occlusal force relationships. Precise analysis that incorporates time resolution and plots the distribution of forces within the occlusion is not possible when employing the traditional occlusal indicator methods. A detailed occlusal force and timing analysis can only be provided by performing a computer-assisted analysis, using the T-Scan III system (Tekscan, Inc. S. Boston, MA, USA), which records changing relative occlusal force levels and real-time occlusal contact sequence data with High Definition (HD) recording sensors. This chapter demonstrates the accuracy and reliability of this computer-based occlusal measurement method that reliably describes the time-dependent distribution of occlusal force evolution.
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Coleman. DDS, Thomas A. "Combining the Air Indexing Method With the T-Scan System to Detect and Quantify Cervical Dentin Hypersensitivity." In Advances in Medical Technologies and Clinical Practice, 829–78. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-5225-9254-9.ch011.
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This chapter introduces the air indexing method for detecting and quantifying cervical dentin hypersensitivity (CDH) as a companion to the T-Scan Occlusal Analysis System which evaluates force and timing values for occlusal contacts of teeth. This chapter will also highlight an evidence-based retrospective investigation undertaken between 1979 and 1996 that evaluated associations and/or correlations between diagnosed CDH and its resolution following occlusal adjustment. This retrospective's method described the detection, diagnosis, and treatment of the signs and/or symptoms of the common clinical finding amongst patients with CDH. Stress physics will illustrate how small occlusal contacts magnify the impact that applied occlusal contact force has on the cervical regions of teeth. This resultant cervical stress is etiologic for how non-carious cervical lesions (NCCLs) form and degrade tooth roots. This chapter also explains how biocorrosion from endogenous and exogenous sources produces loss of dentin's protective proteins, glycoproteins, and cementum, which add to the effects of applied occlusal force, thereby creating CDH symptoms and NCCLs. CDH appears resultant from the co-factors of occlusal forces that produce cervical stress, along with biocorrosion, that are both modified by occlusal surface friction. The air indexing method of CDH diagnosis is an objective diagnostic means to detect and quantify CDH symptoms during the formation of cervical lesions. This chapter presents the clinical benefits of melding the T-Scan Occlusal Analysis System with the Air Indexing Method when clinically assessing and treating cervical hard tissue pathologies. The clinician gains significantly more occlusal insight as opposed to using either methodology alone, when air indexing is combined with T-Scan's occlusal contact force and timing data. Lastly, this chapter introduces two case reports of how T-Scan guided occlusal adjustments can be effective at reducing CDH and prohibiting the progression of gingival recession.
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Sierpińska, Teresa. "The Management of Advanced Tooth Wear Using the T-Scan/BioEMG Synchronization Module." In Handbook of Research on Computerized Occlusal Analysis Technology Applications in Dental Medicine, 467–521. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-6587-3.ch010.
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Tooth wear is considered a normal, age dependent, physiological process that leads to the loss of enamel and dentine. However, in some cases the process is so progressive that it may be pathologic. The focus of this chapter is to present the consequences of advanced tooth wear resultant from parafunction, excessive masticatory forces, imbalanced occlusal contacts, and hyperactive masticatory muscles. This chapter also outlines preventative strategies that can predictably reduce the progression of pathologic wear, which employ the T-Scan 8/BioEMG synchronization module. These two objective companion technologies assess the occlusion before, during, and after dental treatment, as well as predictably control the long-term stability of newly installed fixed, implant-supported, or removable prostheses. Their synchronization correlates muscle activity level information directly to occlusal contact force and time-sequencing information, which when applied together in the wear patient can be instrumental in tempering and eliminating pathologic occlusal wear.
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Sierpińska, MD PhD, Teresa. "Tooth Wear." In Advances in Medical Technologies and Clinical Practice, 879–943. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-5225-9254-9.ch012.
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Tooth wear is considered a normal, age-dependent, physiological process that leads to the loss of enamel and dentine. However, in some cases the process is so progressive that it may be regarded as severe or pathological. The focus of this chapter is to present the consequences of tooth wear resultant from mechanical reasons, such as parafunction, excessive masticatory forces, imbalanced occlusal contacts, and hyperactive masticatory muscles. This chapter will also outline preventative strategies that can predictably reduce the progression of pathologic wear, which employ the T-Scan 8/BioEMG synchronization module. These two objective companion technologies assess the occlusion before, during, and after dental treatment, as well as predictably control the long-term stability of newly-installed fixed, implant-supported, or removable prostheses. Their synchronization correlates muscle activity level information directly to occlusal contact force and time-sequencing information, which when applied together in the wear patient, can be instrumental in tempering and eliminating pathologic occlusal wear.
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Solow, DDS, Roger. "Centric Relation Records and T-Scan Occlusal Analysis of Centric Relation Prematurities." In Handbook of Research on Computerized Occlusal Analysis Technology Applications in Dental Medicine, 649–71. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-6587-3.ch014.
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Occlusal analysis is the examination and diagnosis of the forces generated by the contacting surfaces of teeth. The clinician can use both mounted diagnostic casts and the T-Scan Occlusal Analysis system to understand the role of adverse forces in a patient's dentition. These casts should be mounted in Centric Relation so that they replicate the patient's hinge axis maxillomandibular relationship, absent of tooth contact. Diagnostic casts can demonstrate the mandibular slide into maximum intercuspation, as well as illustrate the excursive contacts. The T-Scan not only records the location of tooth contacts present in Centric Relation, maximum intercuspation, and lateral excursions, but also detects the timing and relative force of all contacts. The rapid display of recorded tooth contact data in the 2- and 3-Dimensional ForceViews makes it practical for intraoral operative use. These modalities can be used separately or in concert depending on the clinical situation. This chapter discusses the clinical technique, advantages, and rationale for identifying Centric Relation prematurities with mounted diagnostic casts and the T-Scan.
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"Occlusal Force." In Encyclopedia of Pain, 2377. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-28753-4_201508.
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Yiannios, DDS, Nick. "Occlusal Considerations in the Hypersensitive Dentition." In Oral Healthcare and Technologies, 398–469. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1903-4.ch010.
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In the literature, Dentinal Hypersensitivity (DH) is considered to arise from exposed dentin and patent dentinal tubules. However, clinical observation of recurrent DH sensitivity indicates it can occur in the presence or absence of exposed dentin. Quantified occlusal contact force and timing parameters have been ignored in studies assessing hypersensitive teeth. This chapter introduces a novel occlusal concept: Frictional Dental Hypersensitivity (FDH). Clinical evidence from combining computerized occlusal analysis and electromyography is presented linking opposing posterior tooth friction and muscular hyperactivity to Dentin Hypersensitivity. This chapter proffers how occlusion, muscular TMD symptoms, and frictional Dentin Hypersensitivity are all related. Lastly, a Pilot Study is presented that used a Visual Numerical Analog scale to quantify Dentin Hypersensitivity resolution observed in symptomatic patients who underwent the Immediate Complete Anterior Guidance Development (ICAGD) coronoplasty. This computer-guided occlusal adjustment eliminated pretreatment FDH symptomatology, further supporting that Dentinal Hypersensitivity has an occlusally-based, frictional etiology.
Conference papers on the topic "Occlusal forces"
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Scrieciu, Monica, Veronica Mercuț, Sanda Mihaela Popescu, Daniela Tărâță, and Eugen Osiac. "OCT aspects of dental hard tissue changes induced by excessive occlusal forces." In Second Canterbury Conference on Optical Coherence Tomography, edited by Ole Bang and Adrian Podoleanu. SPIE, 2018. http://dx.doi.org/10.1117/12.2283560.
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Patel, Nirdesh D., Ian Grosse, Dan Sweeney, David S. Strait, Peter W. Lucas, Barth Wright, and Laurie R. Godfrey. "An Efficient Method for Predicting Fracture of Hard Food Source." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67675.
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In this paper we present a fast and reliable method for estimating the bite force required to fracture hard foods. The process involves complementary physical testing and finite element modeling. For physical testing, metal castings of upper or lower teeth are prepared. Metal tooth castings are mounted on a pivoting fixture interfaced to an Instron machine to simulate bite mechanics and thus to fracture hard food specimens. For the finite element model the tooth surfaces are modeled as rigid surface bodies in a nonlinear multi-load step contact analysis, while the food item is modeled as an elastic body. However, because only tooth surface information is needed in the model, we are able to automatically develop the geometry of the tooth surface using a tactile digitizing stylus with stereo lithographic surface profile information directly exported and subsequently imported into the FEA tool. We therefore avoid the need to laser scan tooth geometry which introduces significant “noise” into the surface model representation that must be painstakingly “cleaned” manually using software tools. The physical testing provides the force required to fracture the food item, while the finite element model provides the complete stress and strain state of the food item at the moment of fracture. Using this approach we have simulated the tooth biting mechanics of fossil primates to estimate biting force required to initiate a crack in a hard food source such as a macadamia nut. These analyses are designed to measure how occlusal morphology affects feeding performance, as the bite force needed to initiate a crack may vary according to tooth shape. The bite forces found using this approach will be used as an input for full-skull finite element models of early hominids (extinct fossil relatives of humans). The results of this work will be useful in testing the hypothesis that derived craniodental features in some of these hominids are adaptations for feeding on hard, brittle, seasonally available foods.
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Ichikawa, Kenta, and Wataru Hijikata. "Development of an Electrostatic Oral Cavity Generator Driven by Occlusal Force*." In 2019 41st Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC). IEEE, 2019. http://dx.doi.org/10.1109/embc.2019.8856933.
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Dai, Ning, Wei Zhao, Hao Liu, Haihua Cui, Xiaosheng Cheng, and Chunbo Tang. "Preliminary study on the digital analysis of occlusion based on the balance of occlusal force model." In 2014 International Conference on Information Science, Electronics and Electrical Engineering (ISEEE). IEEE, 2014. http://dx.doi.org/10.1109/infoseee.2014.6948166.
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Fontenele, Danielle M., Ana P. G. de Oliveira Franco, and Ilda Abe. "Study of the bite force using rigid occlusal device instrumented by Fiber Bragg Gratings: in vivo assays." In Frontiers in Optics. Washington, D.C.: OSA, 2019. http://dx.doi.org/10.1364/fio.2019.jtu4a.126.
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Sego, T. J., Yung-Ting Hsu, Tien-Min Gabriel Chu, and Andres Tovar. "Towards the Optimal Crown-to-Implant Ratio in Dental Implants." In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-67889.
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Short dental implants are commonly recommended to be implemented with small crown-to-implant (C/I) ratios due to their mechanical stability — decreasing C/I ratios cause less deformation in skeletal tissue under occlusal force. However, the long-term stability of short implants with high C/I ratios remains a controversial issue due to biomechanical complications. This study evaluates the strain distribution and functional implications in an implant-supported crown with various C/I ratios using a high-fidelity, nonlinear finite-element model. Several clinical scenarios are simulated by loading implants with various implant lengths (IL) and crown heights (CH). Strain distribution and maximum equivalent strain are analyzed to evaluate the effects and significance of CH, IL, and the C/I ratio. The study shows underloading for certain implant configurations with high C/I ratio. Increasing IL and decreasing C/I in moderation demonstrates a positive effect in long-term stability.