AlRamzi Batoul, AlHalabi Manal, Kowash Mawlood, Salami Anas, Khamis Amar H, Ghoneima Ahmed, Hussein Iyad
Department of Orthodontics and Pediatric Dentistry, Hamdan Bin Mohammed College of Dental Medicine, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai, United Arab Emirates.
Department of Biostatistics, Hamdan Bin Mohammed College of Dental Medicine, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai, United Arab Emirates.
Int J Clin Pediatr Dent. 2024 Jun;17(6):673-682. doi: 10.5005/jp-journals-10005-2858.
The Hall technique preformed metal crowns (HT-PMCs) are allegedly oversized, temporarily altering inter-arch relationships. Intra-arch dimensions and leeway space (LWS) HT effects are unknown.
To study single HT-PMC intra-arch effects and treated tooth dimensional changes.
Split-mouth, quasi-experimental, non-randomized feasibility pilot study. Intraoral scans (iTero II®) were taken preorthodontic separator placement (scan), immediately post single HT-PMCs (scan) in 13 children, and 1 month later (scan) in eight children. Control and study quadrants' lengths ("arcs") and HT-PMCs/control tooth dimensions [mesiodistal (MD), buccopalatal/lingual (BP/L), diagonal (Diag1/Diag2)] were recorded in mm (OrthoCAD® software). Paired -test, repeated analysis of variance (ANOVA) analysis statistics ( < 0.05).
Compared to scan, the mean study arc increased by 0.7 mm (±0.5) ( = 13, -test, < 0.001) at scan, while at scan, it increased by 0.8 mm (±0.34) ( = 8, repeated ANOVA, = 0.008). The HT-PMCs-treated tooth mean dimensions increased at scan by 0.9 mm (MD), 0.8 mm (BP/L), 0.5 mm (Diag1), and 0.7 mm (Diag2) (-test, < 0.001) with similar observations at scan. There were no significant changes in the control arc or the control tooth measurements.
One single HT-PMC increased the intra-arch quadrant length by approximately up to <1 mm. The HT-PMC-treated tooth was marginally oversized. This pilot study paves the way for a more robust study with a larger sample size.
AlRamzi B, AlHalabi M, Kowash M, Do Hall Technique Crowns Affect Intra-arch Dimensions? A Split-mouth Quasi-experimental Non-randomized Feasibility Pilot Study. Int J Clin Pediatr Dent 2024;17(6):673-682.
据称霍尔技术预成金属冠（HT-PMCs）尺寸过大，会暂时改变牙弓间关系。牙弓内尺寸和可用间隙（LWS）的HT影响尚不清楚。
研究单个HT-PMC对牙弓内的影响以及治疗后牙齿尺寸的变化。
采用分口、准实验、非随机可行性初步研究。在13名儿童正畸分离器放置前（扫描）、单颗HT-PMC放置后立即（扫描）以及8名儿童1个月后（扫描）进行口内扫描（iTero II®）。在毫米单位下（使用OrthoCAD®软件）记录对照象限和研究象限的长度（“弧度”）以及HT-PMC/对照牙齿尺寸[近远中（MD）、颊舌/舌侧（BP/L）、对角线（Diag1/Diag2）]。采用配对t检验、重复方差分析（ANOVA）进行统计分析（P<0.05）。
与扫描时相比，研究象限的平均弧度在单颗HT-PMC放置后立即扫描时增加了0.7毫米（±0.5）（n = 13，t检验，P<0.001），而在1个月后扫描时增加了0.8毫米（±0.34）（n = 8，重复ANOVA，P = 0.008）。经HT-PMC治疗的牙齿平均尺寸在单颗HT-PMC放置后立即扫描时，近远中方向增加了0.9毫米、颊舌/舌侧方向增加了0.8毫米、对角线1方向增加了0.5毫米、对角线2方向增加了0.7毫米（t检验，P<0.001），1个月后扫描时观察结果相似。对照象限弧度或对照牙齿测量值无显著变化。
单颗HT-PMC使牙弓内象限长度增加约1毫米以内。经HT-PMC治疗的牙齿略有尺寸过大。这项初步研究为开展更大样本量的更有力研究铺平了道路。
AlRamzi B, AlHalabi M, Kowash M, 霍尔技术冠会影响牙弓内尺寸吗？一项分口准实验非随机可行性初步研究。《国际临床儿科牙科学杂志》2024；17(6):673 - 682。
