Effect of clenching level on mandibular displacement in Kennedy Class II partially edentulous patients

Yamazaki, Mayumi; Yugami, Kei; Baba, Kazuyoshi; Ohyama, Takashi

doi:10.1016/s0022-3913(03)00474-8

Cited by 8 publications

(12 citation statements)

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“…1B). This may be due to changes in the masticatory force direction, resulting from changes in articular inclination, [26][27][28] or ''tilting'' of the mandible under the maximum bite force, 29 which can potentially occur after bilateral loss of molar support. On the other hand, it should be noted that not all subjects in the ML2 group revealed high maximum bite forces.…”

Section: Discussionmentioning

confidence: 99%

Influence of molar support loss on stress and strain in premolar periodontium: A patient-specific FEM study

Kondo

Wakabayashi

2009

Journal of Dentistry

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Section: Discussionmentioning

confidence: 99%

Influence of molar support loss on stress and strain in premolar periodontium: A patient-specific FEM study

Kondo

Wakabayashi

2009

Journal of Dentistry

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“…However, the SDA concept is still considered controversial by many clinicians. It has, for example, been criticized because the loss of molars is associated with reduced masticatory performance and has been reported to lead to mandibular displacement (14) and various changes in the body, which occur at different rates in animals (15, 16). The SDA condition has also been suggested to be associated with an increased risk of changes in the temporomandibular joint (17, 18), TMD, tooth migration, overeruption, and insufficient chewing ability (19–21).…”

Section: Introductionmentioning

confidence: 99%

Patterns of missing occlusal units and oral health‐related quality of life in SDA patients

Baba

Igarashi

Nishiyama

et al. 2008

J of Oral Rehabilitation

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The aim of this study was to explore the relationship between patterns of missing occlusal units (OUs) and oral health-related quality of life (OHRQoL) in subjects with the shortened dental arches (SDAs). Subjects with SDAs were recruited consecutively for 1 month from six university-based prosthodontic clinics. In total, 115 SDA subjects participated (mean age, 58.5 +/- 10.0 years; 71% female). The location and number of missing teeth were examined and the number of missing OUs was calculated. To evaluate OHRQoL, the Japanese version of the Oral Health Impact Profile (OHIP-J) was administered and the summary score of OHIP-J was calculated. The SDA subjects were categorized depending upon the anterior-posterior lengths of the missing or remaining OUs. Regression analyses were performed to investigate the OHIP-J differences between groups of subjects with various anterior-posterior SDA lengths. The analyses revealed that subjects who only lost the second molar contact exhibited significantly better OHRQoL than those who lost more teeth [coefficient: 11.1, 95% confidence interval (CI): 2.8-19.2, P = 0.02]. Furthermore a statistically significant group difference was observed between the groups with and without the first molar occlusal contact (coefficient: 12.8, 95% CI: 1.4 to 24.1, P = 0.03). In conclusion, although our results are of exploratory nature and need validation, patterns of missing OUs are likely to be related to the OHRQoL impairment in SDA subjects with the presence of first molar contact having a particularly important role.

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“…The displaceability of TMJs was regarded as that of the cartilage [ 30 ] because it has a far smaller elastic modulus than that of the TMJ disc [ 34 , 35 ]. Therefore, the elastic modulus of the springs corresponding to TMJs was determined based on the thicknesses of the TMJ disc [ 36 ] and articular cartilage [ 35 ], the stress-strain curve of the intervertebral discs [ 30 ], and the displacement of the condyle [ 37 , 38 ] in intercuspal clenching by indirect measurement. Although the material properties of the human body vary on an individual basis, the models used in this study were therefore considered to be appropriate to investigate the distribution of occlusal forces on the teeth, implants, and TMJs.…”

Section: Discussionmentioning

confidence: 99%

Significance of mandibular molar replacement with a dental implant: a theoretical study with nonlinear finite element analysis

2018

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BackgroundDental implants are frequently applied to unilateral defects in the mandible. However, implant placement in the molar region of the mandible can be difficult due to anatomical structure. The aim of this study was to evaluate the distribution of occlusal force in a mandibular shortened dental arch (SDA) with implants.MethodsThree-dimensional finite element (FE) models of the mandible with varying numbers of teeth and implants were constructed. Models Im6 and Im67 contained one and two implants in the defect of the left molar region, respectively. Models Im456 and Im4567 contained three and four implants in the defect of the left premolar and molar regions, respectively. Model MT67 contained a defect in the molar region with no implant placed. Model MT7 represented natural dentition without a left second molar, as a control. Modification of the condition of occlusal contacts assuming the intercuspal position was performed before analysis under load 400 N; therefore, the load condition as total force on the occlusal surface was 400 N. FE analyses were subsequently performed under load conditions of loads 100, 200, and 800 N. The distribution of reaction forces on the occlusal surface and the mandibular condyle was investigated.ResultsForce distribution in models Im67 and Im4567 appeared to be symmetrical under all load conditions. Occlusal force distribution in models Im6 and Im456 was similar to that in model MT7. However, the occlusal force at the second premolars on the defect side in those models was larger under loads 100 and 200 N. Conversely, the occlusal force on the first molars was much larger than that in model MT7 under load 800 N.ConclusionsWithin the limitations of this theoretical study, we demonstrated that restoration with the same number of implants as missing teeth will show almost symmetric occlusal force distribution, and it will produce less biomechanically stress for a unilateral defect of the mandible. However, if restoration of a missing second molar with an implant is impossible or difficult, then an SDA with implants may also be acceptable except for individuals with severe bruxism.

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Effect of clenching level on mandibular displacement in Kennedy Class II partially edentulous patients

Cited by 8 publications

References 0 publications

Influence of molar support loss on stress and strain in premolar periodontium: A patient-specific FEM study

Influence of molar support loss on stress and strain in premolar periodontium: A patient-specific FEM study

Patterns of missing occlusal units and oral health‐related quality of life in SDA patients

Significance of mandibular molar replacement with a dental implant: a theoretical study with nonlinear finite element analysis

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