“…These results enhance recent studies that have identi ed the importance of phenotypic characteristics on treatment response, by showing the relevance of MAD design features considering the kinematic behavior of the mandible as part of a personalized approach to treatment [18,30].…”
Section: Discussionsupporting
confidence: 75%
“…Appliances with limitation of mandibular opening are more effective in decreasing AHI [36]. Therefore, as shown in recent studies [18], the devices should incorporate vertical control in the design to not allow the jaw to move backwards at any time while opening the mouth, instead of trying to mitigate this limitation by adding lateral elastic hooks to close the mouth during sleep.…”
Section: Discussionmentioning
confidence: 99%
“…A simpli ed kinematic border movement model of the mandible in the sagittal plane was used to determine the Posselt diagram. Simpli cation of the Posselt diagram was calculated using the cephalometric radiograph [18].…”
Background. The mandibular opening path movements have different directions according to the craniofacial morphology of the patient but always downward and backward, therefore increasing the collapse of the upper airway. The aim of this work is to determine if there is a relationship between the craniofacial morphology and the mandibular movement to help understand the impact on the mandibular position. Methods. 52 students with full permanent dentition aged 19 to 23 years (mean 21.3 SD 1.7; 29 females and 23 males), participated in the study. Each subject had a lateral cephalometric radiograph taken. The opening angle was determined for two levels of vertical openings at 5 and 10 mm.Results. The opening angle showed a greater variability between subjects ranging from 63,15 to 77,08 for 5 mm angle and from for 61,65 to 75,72 for the 10 mm angle. Differences of facial phenotypes was evident when comparing the individual dissoccluding angle of the low angle horizontal pattern and high angle vertical pattern.Conclusions. The opening angle is related to craniofacial morphology with higher vertical anterior and shorter anteroposterior faces having a more horizontal path of mandibular movement than shorter vertical anterior and longer anteroposterior subjects who have a more vertical path.
“…These results enhance recent studies that have identi ed the importance of phenotypic characteristics on treatment response, by showing the relevance of MAD design features considering the kinematic behavior of the mandible as part of a personalized approach to treatment [18,30].…”
Section: Discussionsupporting
confidence: 75%
“…Appliances with limitation of mandibular opening are more effective in decreasing AHI [36]. Therefore, as shown in recent studies [18], the devices should incorporate vertical control in the design to not allow the jaw to move backwards at any time while opening the mouth, instead of trying to mitigate this limitation by adding lateral elastic hooks to close the mouth during sleep.…”
Section: Discussionmentioning
confidence: 99%
“…A simpli ed kinematic border movement model of the mandible in the sagittal plane was used to determine the Posselt diagram. Simpli cation of the Posselt diagram was calculated using the cephalometric radiograph [18].…”
Background. The mandibular opening path movements have different directions according to the craniofacial morphology of the patient but always downward and backward, therefore increasing the collapse of the upper airway. The aim of this work is to determine if there is a relationship between the craniofacial morphology and the mandibular movement to help understand the impact on the mandibular position. Methods. 52 students with full permanent dentition aged 19 to 23 years (mean 21.3 SD 1.7; 29 females and 23 males), participated in the study. Each subject had a lateral cephalometric radiograph taken. The opening angle was determined for two levels of vertical openings at 5 and 10 mm.Results. The opening angle showed a greater variability between subjects ranging from 63,15 to 77,08 for 5 mm angle and from for 61,65 to 75,72 for the 10 mm angle. Differences of facial phenotypes was evident when comparing the individual dissoccluding angle of the low angle horizontal pattern and high angle vertical pattern.Conclusions. The opening angle is related to craniofacial morphology with higher vertical anterior and shorter anteroposterior faces having a more horizontal path of mandibular movement than shorter vertical anterior and longer anteroposterior subjects who have a more vertical path.
“…A simplified kinematic border movement model of the mandible in the sagittal plane was used to determine the Posselt diagram. Using the cephalometric radiograph a simplification of the Posselt diagram was calculated [ 18 ]. Fig.…”
Background
The mandibular opening path movements have different directions according to the craniofacial morphology of the patient but always downward and backward, therefore increasing the collapse of the upper airway. The aim of this work is to determine if there is a relationship between the craniofacial morphology and the mandibular movement to help understand the impact on the mandibular position.
Methods
52 students with full permanent dentition aged 19 to 23 years (mean 21.3 SD 1.7; 29 females and 23 males), participated in the study. Each subject had a lateral cephalometric radiograph taken. The opening angle was determined for two levels of vertical openings at 5 and 10 mm.
Results
The opening angle showed a greater variability between subjects ranging from 63.15 to 77.08 for 5 mm angle and from for 61.65 to 75.72 for the 10 mm angle. Differences of facial phenotypes was evident when comparing the individual dissoccluding angle of the low angle horizontal pattern and high angle vertical pattern.
Conclusions
The opening angle is related to craniofacial morphology with higher vertical anterior and shorter anteroposterior faces having a more horizontal path of mandibular movement than shorter vertical anterior and longer anteroposterior subjects who have a more vertical path.
“…The dynamic behavior of flexible components (such as valve springs) is studied by developing kineto-elasto dynamics method. The effects of deflection and torsional vibration of the camshaft are also considered in the study [11].…”
Section: Vishalkumar K Dhummansure D Ramesh Rao and Yogesh Bagmarmentioning
The optimization of the cam profile plays an important role to reduce noise and vibration in an internal combustion engine. This study analyzes a method for the design and experimentation of different cam profiles. The proposed method commences with the use of higher order polynomials for the cam profile. Subsequently, an optimum cam profile is redesigned and used in the engine. The improvement of the cam profile is based on optimized factors such as velocity and acceleration in the cam profile. The vibration and noise due to impact between cam and tappet can be controlled by adjusting the ramp height and the velocity in the ramp area. Also, there is a significant improvement in Sound quality. The experimental result shows a reduction in overall noise by 1.86dB (A) in case of optimized cycloidal cam profile of single cylinder engine.
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