the tweed profile - The Charles H. Tweed International Foundation

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A .020 x .025 stainless steel T-loop archwire is an excellent adjunct for correcting overbite. As the FMA increases, the need for support with the high pull j-hook headgear increases proportionally. The T-loop utilizes a 10-2 system in that it intrudes the centrals, then the laterals, then the canines. It is a sequential system that has been quite effective in my practice over the last 30 years. However, one must be very careful when using it and pay very close attention to the canine reaction. If the canines begin to extrude or tip, a compensation 2nd order bend with at least a 7˚ distal root tip, must be made distal to the canine. Once the canine has been stabilized in a good position, the 10-2 system of incisor intrusion can be reinstated, first intruding the centrals and the mesial of the laterals (thus creating distal root tip), then stepping up the T-loop and flattening the curve to intrude the laterals. A word of caution ‒ preformed T-loop archwires are ineffective because they are incorrectly formed and the location of the T-loops is not precise. Orthopli makes a T-loop plier that you can order if you mention my name. (I receive no royalties). If you are interested in the construction of the T-loop, e-mail me (bob@stonerortho. com) and I will send you a PDF on how to construct the T-loop archwire with the T-loop plier. 19
CHANGES IN ARCH WIDTH AFTER ORTHODONTIC TREATMENT: A LITERATURE REVIEW HYO EUN KIM DAEGU, KOREA It is a well established fact that increases in dental arch width during orthodontic treatment tend to return toward pretreatment values during and after retention. However, changes in arch width inevitably occur during and after orthodontic treatment as a result of growth or treatment. In this literature review the historical background of maintenance of arch width is studied and some consequences of changing of arch width during treatment are also discussed. MAINTENANCE OF ARCH WIDTH DURING ORTHODONTIC TREATMENT In the middle 1920s, the apical base school formed around the writings of Axel Lundström who suggested that the apical base was one of the most important factors in the correction of malocclusion and maintenance of a correct occlusion. Nance noted that “if a stable result is to be attained, mandibular teeth must be positioned properly in relation to basal bone.” McCauley made the following statement, “since these two mandibular dimensions, molar width and cuspid width, are of such an uncompromising nature, one might establish them as fixed quantities and build the arches around them.” After measuring a large number of cases, including successes and failures, Strang drew certain conclusions and said, “Stable results can only be gained when the width of the mandibular denture in the canine and molar areas is maintained inviolate.” The ‘lateral limit’ is referred to as one of four basic premises defined by Merrifield’s ‘diagnostic concept of dimensions of the dentition’. Vaden said, “lateral expansion works if you believe in permanent retention.” and “the dentitions that exhibited the most relapse are, in most instances, the ones that have undergone the most mandibular canine expansion.” COMPARISONS OF THE ARCH WIDTH CHANGES BETWEEN EXTRACTION AND NON-EXTRACTION TREATMENT Motivated by a question that concerned the possibilities of dental arch expansion and the maintenance of such expansion, Walter investigated 50 non-extraction cases and 50 extraction cases. Intercanine width and intermolar width were measured before treatment, following completion of active treatment, and at least one year following removal of retainers. In 31 or 62% of the non-extraction cases, an increase of 2.0 mm of intercanine width was obtained and maintained. And in the extraction cases 31 or 62% showed an increase of 1.4 mm of intercanine width which was also obtained and maintained. In 36 or 72% of the cases in the non-extraction group an average increase of 1.8 mm was obtained and maintained in intermolar widths. Conversely, in the extraction sample intermolar widths, 35 or 70% of the cases demonstrated a contraction or decrease of 2.9mm. Overall, the intercanine distances behaved the same in the non-extraction and extraction cases: the intermolar distances of the non-extraction cases tended to increase and those of the extraction cases to decrease. Bishara et al. evaluated treatment and posttreatment changes in the dental arches of patients with Class II, division 1 malocclusions. Half the patients (N=46) were treated with a non-extraction approach; treatment 20
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 16 and 17: She was treated with Tweed-Merrifie
Page 18 and 19: This will Increase the Amount of In
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,

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