Halapanavar Bhakti, Padmini M N, Deshmukh Sonali, Tirupathi Sunnypriyatham, Waremani Afshan S, Kasodekar Aniket
Department of Orthodontics & Dentofacial Orthopedics, Dr DY Patil Dental College and Hospital, Dr DY Patil Vidyapeeth (Deemed to be University), Pune, Maharashtra, India.
Department of Orthodontics, Government Dental College and Research Institute, Bengaluru, Karnataka, India.
Int J Clin Pediatr Dent. 2024 Jan;17(1):7-14. doi: 10.5005/jp-journals-10005-2727.
This current study evaluated and compared the skeletal changes in the head of the condyle, glenoid fossa, and articular space between the twin block appliance and PowerScope™ a fixed functional appliance.
This study was a pilot, randomized, single-blinded, assessing the skeletal changes in the components of the temporomandibular joint (TMJ) using cone-beam computed tomography (CBCT). The study was conducted in 20 subjects in the age range of 11-14 years with class II division 1 malocclusion. These subjects were distributed randomly between two groups with an allocation ratio of 1:1 (group I-twin block and group I-PowerScope™). Follow-ups of both groups were done till desirable skeletal correction was attained (clinical edge-to-edge incisor relation).
Condylar parameters such as position, height, and length were evaluated bilaterally in the CBCT scans. After using both devices, there was an increase in all condylar qualities; however, the twin block appliance showed a more noticeable difference, which has been determined to be statistically significant. In the twin block group, there was an average decrease of 0.56 mm in the anterior articular space and an increase of 1.2 and 2.64 mm in the middle and posterior articular spaces, respectively. In the PowerScope™ group, there was an average decrease of 0.23 mm in the anterior articular space and an increase of 2.55 and 1.85 mm in the middle and posterior articular spaces, respectively. In the case of the twin block device, the change in glenoid fossa angle was observed to be 6.1 mm on both sides and a mean difference of 1.25 mm on the right-side and 1.75 mm on the left-side was observed in the case of PowerScope™. The difference was established to be significant with a < 0.05 in all cases.
Condylar attributes increased after the application of both devices but the difference was more pronounced in the case of twin block appliances. The difference in articular space (middle and posterior) between the twin block group and PowerScope™ group, was not significant statistically. In the present study, the remodeling in the glenoid fossa was greater in the twin block group compared to the PowerScope™ group.
Halapanavar B, MN P, Deshmukh S, Comparison of Skeletal Changes in the Temporomandibular Joint between the Twin Block Appliance and Fixed Functional Appliance: A Longitudinal Follow-up Study. Int J Clin Pediatr Dent 2024;17(1):7-14.
本研究评估并比较了 Twin Block 矫治器和 PowerScope™ 固定功能矫治器在髁突头部、关节窝和关节间隙的骨骼变化。
本研究为一项初步的、随机、单盲研究，使用锥形束计算机断层扫描（CBCT）评估颞下颌关节（TMJ）各组成部分的骨骼变化。该研究纳入了 20 名年龄在 11 - 14 岁、安氏 II 类 1 分类错牙合的受试者。这些受试者被随机分为两组，分配比例为 1:1（I 组 - Twin Block 矫治器组和 II 组 - PowerScope™ 矫治器组）。对两组进行随访，直至达到理想的骨骼矫正效果（临床前牙切对切关系）。
在 CBCT 扫描中双侧评估髁突参数，如位置、高度和长度。使用两种矫治器后，所有髁突指标均有所增加；然而，Twin Block 矫治器显示出更明显的差异，经判定具有统计学意义。在 Twin Block 矫治器组中，前关节间隙平均减小 0.56 mm，中关节间隙和后关节间隙分别增加 1.2 mm 和 2.64 mm。在 PowerScope™ 矫治器组中，前关节间隙平均减小 0.23 mm，中关节间隙和后关节间隙分别增加 2.55 mm 和 1.85 mm。对于 Twin Block 矫治器，关节窝角度两侧变化为 6.1 mm，而对于 PowerScope™ 矫治器，右侧平均差异为 1.25 mm，左侧为 1.75 mm。在所有情况下，差异均具有统计学意义（P < 0.05）。
两种矫治器应用后髁突指标均增加，但 Twin Block 矫治器的差异更为明显。Twin Block 矫治器组和 PowerScope™ 矫治器组在关节间隙（中关节间隙和后关节间隙）的差异无统计学意义。在本研究中，与 PowerScope™ 矫治器组相比，Twin Block 矫治器组关节窝的重塑更为明显。
Halapanavar B, MN P, Deshmukh S, Twin Block 矫治器与固定功能矫治器颞下颌关节骨骼变化的比较：一项纵向随访研究。《国际临床儿科牙科学杂志》2024；17(1):7 - 14。
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