the tweed profile - The Charles H. Tweed International Foundation

More documents

Recommendations

Info

• Intercanine diameter: measured on axial slices at apex and crown tip height (Fig. 14- Fig. 15) • Intermolar diameter: measured on axial slices at palatal root apex and crown height (center of palatal surface) (Fig. 16- Fig. 17) • Maxillary right central incisor-PNS (projection): measured on sagittal slices at apex, CEJ and margin height (Fig. 18) • Maxillary right molar-PNS (projection): measured on sagittal slices at distovestibular root apex, CEJ and distal cusp height (Fig. 19) Fig. 17: Intermolar diameter measured at crown height Fig. 14: Intercanine diameter measured at apex height Fig. 18: Maxillary right central incisor-PNS (projection), measured at apex, CEJ and margin height Fig. 15: Intercanine diameter measured at crown tip height Fig. 19: Maxillary right molar-PNS (projection), measured at distovestibular root apex, CEJ and distal cusp height Fig. 16: Intermolar diameter measured at palatal root apex height STASTICAL ANALYSIS Data was examined with SPSS v.18.0 software (Chicago, Illinois, USA). Statistical analysis was carried out with U Mann-Whitney test for the two unrelated group comparison. T-test for paired data was used for the comparison of pre and post treatment values. Significance level was set at 0.05. 29
RESULTS VOLUMETRIC MEASURES Palatal volume increased between T1 and T2 from 9.35 cm3 to 10.48 cm3 (10.78%) for group I and from 9.38 cm3 to 10.41 cm3 (9.89%) for group II. Airway space volume included between lower first molars perceived a reduction from 1.57 cm3 to 1.30 cm3 (-17.19%) for group I and from 1.84 cm3 to 1.33 cm3 (-27.71%) for group II. SKELETAL MEASURES Transverse skeletal diameter at the canine increased from 3.59 cm to 3.66 cm for group I and from 3.82 cm to 3.87 cm for group II. Transverse skeletal diameter at the molar increased from 5.77 cm to 5.80 cm for group I and from 5.17 cm to 5.73 cm for group II. A decrease was recorded in mandibular alveolar bone thickness: 1.46 cm - 1.40 cm (-1.0%) on average for group I and 1.34 cm - 1.28 cm (-1.0%) on average for group II. Measures on sagittal slices revealed an increase in the distance ANS-PNS equal to 0.09 cm (5.04 cm - 5.13 cm) for group I and equal to 0.17 cm (4.64 cm - 4.81 cm) for group II. Palatal vault height increased by 0.07 cm (1.40 cm-1.47 cm) for group I and by 0.09 cm (1.82 cm-1.91 cm). DENTAL MEASURES Inclination of maxillary first molars increased to 2.13° (93.42° - 95.55°) on average for group I, 4.02° (104.06° - 108.08°) on average for group II. Mandibular first molars showed a reduction of 4.58° (100.38°- 95.78°) on average in group I, 1.77° (101.99°- 100.29°) on average in group II. Intercanine diameter at the apex showed an increase of 0.13 cm (2.48 cm – 2.61 cm) for group I and 0.10 cm (2.82 cm – 2.93 cm) for group II. At tip variation was 0.36 cm (2.92 cm – 3.28 cm) for group I and 0.07 cm (2.81 cm - 2.89 cm) for group II. Intermolar diameter measured at the apex showed an increase of 0.40 cm (3.04 cm - 3.44 cm) for group I and 0.09 cm (3.08 cm - 3.17 cm) for group II. At the crown variation was 0.40 cm (3.20 cm - 3.60 cm) for group I and 0.25 cm (3.30 cm - 3.54 cm). Sagittally, the distance between maxillary right central incisor and PNS showed a variation of 0.05 cm (4.10 cm - 4.15 cm), 0.00 cm (4.20 cm - 4.20 cm), -0.03 cm (4.79 cm - 4.77 cm) respectively for apex, CEJ and crown for group I and 0.16 cm (3.59 cm - 3.76 cm), 0.31 cm (3.67 cm - 3.98 cm) and 0.43 cm (4.24 cm - 4.67 cm) for group II. Sagittally, the distance between the maxillary right molar and PNS increased by 0.11 cm (1.78 cm - 1.90 cm), 0.15 cm (1.25 cm - 1.40 cm), 0.06 cm (1.20 cm - 1.26 cm) respectively for the distovestibular root apex, CEJ and distal cusp tip for group I and by 0.22 cm (1.35 cm - 1.56 cm), 0.40 cm (0.78 cm -1.18 cm) and 0.40 cm (0.60 cm - 1.00 cm). DISCUSSION The aim of this research was to evaluate the tridimensional effects of RME when employed for tranverse maxillary deficiency correction; in particular, a comparison of the effects of RME on permanent and RME on deciduous teeth was done. The employment of CBCTs allowed analysis of volumetric, skeletal and dento-alveolar parameters. The applicability of CBCTs in orthodontics has been limited by high costs, the long attainment time (MRI) and the high radiation dose. Nevertheless, in the last few years, CBCT images are becoming more and more common in clinical practice because of their ability to visualize pathologies in three dimensions and their evolution in terms of cost, access and decreased overall effective absorbed doses of radiation 27 . The accuracy of linear and volumetric measurements obtained by CBCT have been tested by many authors, such as Mischkowski et al. 28 , who used gutta-percha markers and concluded that the CBCT device provides satisfactory information about linear distances, and Lagravere et al. 29 , who used titanium markers with a hollow cone on a synthetic mandible and concluded that volumetric renderings from the CBCT device produce a 1:1 image-to-reality ratio. 30
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 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 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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?