Orthodontics and Dentofacial Orthopedics

Directory: AAO Officers and Organizations Publication date: June 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 155, Issue 6 Author(s):

Craniofacial embryogenetics and development Publication date: June 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 155, Issue 6 Author(s): David S. Carlson

June 2019:155(6) Publication date: June 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 155, Issue 6 Author(s): Dr Allen H. Moffitt

Searching the literature for studies for a systematic review. Part 5: Beyond the standard electronic databases Publication date: June 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 155, Issue 6 Author(s): Anne Littlewood, Dimitrios Kloukos

It's enough to make your hair stand on end Publication date: June 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 155, Issue 6 Author(s): Laurance Jerrold

Comparison of automated grading of digital orthodontic models and hand grading of 3-dimensionally printed models Publication date: June 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 155, Issue 6 Author(s): Jonathan D. Scott, Jeryl D. English, Benjamin E. Cozad, Catharine L. Borders, Lacey M. Harris, Audrey L. Moon, F. Kurtis Kasper Introduction Emerging workflows in orthodontics enable automated analysis of digital models and production of physical study models from digital files for the evaluation of treatment outcomes. The objective of this study was to compare the automated assessment of digital orthodontic models and the hand grading of 3D-printed models with the use of the American Board of Orthodontics cast-radiograph evaluation (ABO CRE) system. Methods Plaster models from 15 cases were scanned with the use of a desktop model scanner to create digital models from which physical models were produced with the use of a stereolithography-based 3D printer. All digital models from each case were graded with the use of an automated software tool (SureSmile), and 3D-printed models were scored by hand with the use of the ABO CRE grading system. All hand-graded models were scored a second time at least 2 weeks later. Results SureSmile gave statistically significantly higher scores to alignment and rotations (P < 0.001), overjet (P < 0.001), occlusal contacts (P < 0.001), and total score (P < 0.001). Hand grading scored higher in buccolingual inclination (P < 0.001). No significant differences were found in marginal ridges, occlusal relationships, and interproximal contacts. Conclusions Scores assessed in an automated manner by SureSmile are generally significantly greater than those assessed by hand grading.

A needle in a haystack: Report of a retained archwire fragment in the pterygomandibular space Publication date: June 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 155, Issue 6 Author(s): Carolyn B. Bradford, Bhavna Shroff, Robert A. Strauss, Daniel M. Laskin This clinical report describes a retained archwire fragment, discovered during a new-patient examination of a young woman seeking orthodontic retreatment. The diagnostic process, care coordination, and patient management decisions are discussed, along with a brief exploration of clinical considerations associated with this incident. A suggested emergency prevention and response protocol is also presented.

A simple approach to correct ectopic eruption of maxillary canines Publication date: June 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 155, Issue 6 Author(s): Jamille Barros Ferreira, Giordani Santos Silveira, José Nelson Mucha This case report describes the orthodontic treatment of a patient with severe crowding; the maxillary right canines were ectopic, positioned far to the buccal side, and superimposed on the lateral incisors in near-transposition. Treatment included extraction of the 4 first premolars. A transpalatal bar was used as an anchorage device, and beta-titanium T-loop springs (0.019 × 0.025″) were used to better control the ideal force applied to retract the maxillary canines. A segmental T-loop spring was used as if it were a modified system of the segmental archwire technique. After the canines were retracted and space created for the anterior teeth, the latter were included in the treatment and the treatment was finished in the usual manner. Excellent results were achieved, both esthetic and functional. The treatment choices and their straightforward approach were appropriate, yielding predictable and stable results in the long term.

A novel approach of torque control for maxillary displaced incisors Publication date: June 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 155, Issue 6 Author(s): Qian Jiang, Ren Yang, Li Mei, Qiaoling Ma, Tuojiang Wu, Huang Li Effective torque control is crucial for the successful treatment of impacted incisors; however, torque control is often a challenge with the use of conventional bracket systems, especially when the adjacent teeth require opposite torque managements. A novel approach of torque control for adjacent anterior teeth is introduced in this case report. A 12-year-old boy had an impacted maxillary right central incisor with the adjacent teeth severely displaced. The treatment plan was to regain space and pull the impacted incisor into the dentition. An upper removable appliance was first used to regain space for the impacted central incisor, followed by a spontaneous eruption of the impacted incisor. Subsequently, fixed appliances were bonded to level and align the dentition. However, the crown of the maxillary right central incisor was found to be tipped lingually, while the maxillary right lateral incisor was tipped labially. Traditional torque control, including torque bend and the use of a Warren spring, were first used for the correction, but they were ineffective due to the overlap of the root apex of the maxillary central incisor and lateral incisor. After the roots were separated with a V-shaped curve, auxiliary brackets were bonded on the gingival one-third areas of the maxillary incisors and canine with nickel-titanium wires used for the torque control. This approach of using the auxiliary brackets and wires was demonstrated to be efficient and effective in the torque control of adjacent anterior teeth with opposite torque control requirements. The final result and the 2-year follow-up records demonstrated the proper torque of anterior teeth and good and stable dental and profile esthetics.

Association of incisal overlaps with /s/ sound and mandibular speech movement characteristics Publication date: June 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 155, Issue 6 Author(s): Ruirui Liu, Anni Hu, Lin Niu, Fang Wang, Yi Lu, Qin Zhou Introduction Modern anterior restorations are intended to achieve esthetic and functional reconstruction and coordination. The positioning of the anterior teeth can affect pronunciation, but the effect of anatomic factors on pronunciation after anterior restoration has not been critically tested. The purpose of this study was to provide possible references for the design of the anterior overlaps in future anterior restorations. Methods Thirty-nine subjects with normal occlusion (NO) participated. They completed questionnaires, were examined clinically, and were recorded pronouncing the /s/ sound. Links between overlaps with spectral features of the /s/ sound and mandibular movements during speech were investigated. Results When NO subjects pronounced the /s/ sound, the average fricative length was 202.54 ± 44.57 ms; the average noise peak was 4052.89 ± 445.80 Hz, which was in the high-frequency region; the center of gravity was 2452.85 ± 623.50 Hz; and the mean intensity was 40.61 ± 4.99 dB. The mandibular speech movements showed a slightly long and narrow backward and downward oblique path. Overbite positively correlated with the /s/ sound's noise peak frequency and negatively correlated with the maximum closing speed. Overjet negatively correlated with the maximum distance in the sagittal plane. Conclusions This is the first attempt to correlate the spectral features of the /s/ sound and speaking movements with incisal overlaps. The results suggest that significant associations exist and that these associations can offer some references for esthetic anterior restoration.

Alexandros Sfakianakis
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