the tweed profile - The Charles H. Tweed International Foundation

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She was treated with Tweed-Merrifield mechanics and extraction of four first premolars. The mandibular arch was supported with a high-pull J-hook headgear to counteract the intrusive/flaring force to the mandibular incisors and the resultant molar eruption reaction. This force system resulted in a clockwise or forward mandibular response with reduction of gingival display and an improvement in the Z-angle. The upper arch was treated with a T-loop archwire to facilitate incisor intrusion and gingival display reduction. Note that when a Class II relationship is changed to Class I, the patient it continues to grow as a Class I. Tweed-Merrifield Non-extraction Supported Extraction Arch • Molar height is maintained and the occlusal plane rotates counter-clockwise • Resulting in a forward mandibular response • Unsupported Non-extraction Arch Extruded molars rotate mandible down and back Note below the difference in mandibular response between the two patients. The difference is due to vertical control. In the non-extraction patient vertical control was impossible. In the extraction patient vertical control was enhanced with high pull headgear to both arches. 13
T-LOOP MECHANICS Incisor intrusion with T-loops is an augmentation of traditional incisor intrusion methods, especially for the low angle patient and for the less than ideal cooperator. It is absolutely imperative that it be done with stainless steel archwires to give the resilience needed to control anchorage and vertical dimension. The high-pull J-hook headgear’s importance as an auxiliary increases in proportion to the increase in the degrees of FMA. When the FMA is 25˚ or higher, it is essential. In patients who have an FMA greater than 30˚, one must be very careful with T-loop use in order to control the canine and occlusal plane as well as the molars. If the space between the canines and lateral incisors is greater than 3.5 mm, it is best to place the headgear to soldered hooks between the central and lateral incisors. Once the space is less than 3.5mm, it is usually advisable to place the headgear mesial to the canines (which are ligated with wire ties from the distal to prevent rotation) to prevent canine extrusion and tipping reaction from the incisor intrusion on the T-loops. The high-pull J-hook headgear should deliver 14 -18 oz (400 – 500 g.) of force per side. T-loop Dimensions First Activation of T-loop to Intrude Centrals How to Place the Bow in the Anterior Always Confirm 3rd Order 14
Page 1 and 2: THE TWEED PROFILE PUBLISHED BY THE
Page 3: CONTENTS 2 ORTHODONTICS IN THE AGE
Page 6 and 7: FACIAL ESTHETICS - A VALID TREATMEN
Page 8 and 9: the final result. Communication wit
Page 10 and 11: VERTICAL CONTROL FOR THE CLASS II P
Page 12 and 13: The following records are those of
Page 14 and 15: This patient has crowding and is sl
Page 18 and 19: This will Increase the Amount of In
Page 22 and 23: A .020 x .025 stainless steel T-loo
Page 24 and 25: for the other half (N=45) included
Page 26 and 27: tooth alignment. Long term stabilit
Page 28 and 29: RME ON PERMANENT VS RME ON DECIDUOU
Page 30 and 31: The “New REP” was retained for
Page 32 and 33: • Intercanine diameter: measured
Page 34 and 35: The second CBCT was repeated 10 mon
Page 36 and 37: 30. Ricketts RM, Roth RH, Chaconas
Page 38 and 39: DISCUSSION The described clinical a
Page 40 and 41: tion effect was created by the shif
Page 42 and 43: ceptable and favored by the Japanes
Page 45 and 46: CORRECTION OF ADULT SKELETAL CLASS
Page 47 and 48: applied for 10 to 12 hours a day an
Page 49 and 50: TREATMENT RESULT The patient was tr
Page 51 and 52: Cephalometrically, there was a good
Page 53 and 54: REFERENCES 1. Zachrisson B, Alnaes
Page 55 and 56: The panoramic X-ray (Fig 3) shows n
Page 57 and 58: Fig 15 Fig 18 Fig 16 Fig 19 SUMMARY
Page 59 and 60: the rather short anterior-posterior
Page 61: Figure16 correction which, in turn,

the tweed profile - The Charles H. Tweed International Foundation

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