Orthodontic Treatment Of Canted Occlusal Plane

Objective: To evaluate the effect of canted occlusal plane treated with orthodontic treatment on the patiens with angle class I malocclusion.Materials and Methods: Three cases of angle class I permanent dentition were included in patients with skeletal class I occlusion plane deviation,skeletal class II occlusion plane deviation and skeletal class II high angle malocclusion.The first case is a patient with angle class ? skeletal class ? malocclusion and occlusion plane deviation,whose chief complaint is “asymmetry and deviation of facial,requiring treatment”.The left side of the face is fuller than the right side,the chin deviation is about 8 mm to the left.The mouth opening degree is normal,mouth opening type is skewed and together with joint clicking.The relationship of the molars is neutral,the distal relationship of the left canine,and the proximal relationship of the right canine.A deep overbite with ? degrees,overjet is 2 mm.The maxillary midline is neutral and the mandibular midline is deflected about 6 mm to the left.The Damon 3MX standard torque straight wire appliance and MIA(Micro Implane Anchorage)were used in the treatment,with non-extraction tooth treatment,and aligning the dentition,adjusting the irregularity dentition midline,occlusion plane deviation and facial asymmetry are correction and improvement.The second case is a patient with angle class ?,skeletal class ? malocclusion and plane deviation,whose chief complaint is "teeth irregularity,facial asymmetry,referral from oral and maxillofacial surgeons".The right side of the face was fuller than the left side,the chin right deviation is about 5 mm.The maxillary first molar on the right side was extracted three years ago because of caries.The relationship of left molar and canine are neutral,and the right canine was distal-middle.The midline of maxilla is straight,and the midline of mandible is about 2 mm to the right.The treatment plan is to use MBT straight wire fixing appliance,extract four premolars,arrange and level the dentition,adjust the dentition midline,the relationship between canines and molars,and correct facial asymmetry by using MEAW(Multi-loop Edgewise Arch Wire)and MIA.The third case is a permanent dentition patient with angle class ?,skeletal class ? and high-angle skeletal facial pattern malocclusion,whose chief complaint is "snaggletooth and irregular dentition".The overbite is 2 mm,overjet is 4 mm,the Spee curve on the left side is 4 mm,right side is 2.5 mm,crowding degree: the upper dentition is 5.5 mm,the lower dentition is 5 mm,the Bolton proportion is coordination.The treatment plan is extract four first premolars and the lower left wisdom teeth,to relieve the crowdedness of the dentition,flatten the Spee curve,and align dentition.In the later treatment period,by the use of MIA,adjustment slope of the occlusion plane,counterclockwise rotation of the mandible,the chin more prominent than the front,improve the profile,and form a coordinated face.Results: After the treatment,the teeth are arranged neatly,a good occlusion relationship is established,Normal overbite and overjet are obtained,the occlusion plane deviation is corrected,the profile is more coordinated,and the facial asymmetry is improved.Conclusion: Under the correct diagnosis and reasonable treatment plan design,through certain time series and correction direction sequence arrangement,in the horizontal direction,mild occlusion plane deviation and facial asymmetry can be controlled by orthodontic masking therapy,in the sagittal direction,occlusion plane can also be adjusted by the plane tilt,causing the rotation of the jaw in the vertical direction to improve the profile.The orthodontists should have a comprehensive understanding of the occlusion plane from the three-dimensional direction.