Comparison of treatment effects during en‐masse retraction of upper anterior teeth placed using mini‐implants placed at infrazygomatic crest and interradicular sites: A randomized controlled trial.

Introduction: The objective of this prospective study was to examine the efficacy of posterior interradicular and infrazygomatic crest mini‐implants for en‐masse anterior retraction. Methods: The 22 patients were divided into two groups. In group 1 (IZC n = 11), mini‐implants were placed in the infrazygomatic crests and in group 2 (IR, n = 11), mini‐implants were placed in the molar‐premolar interradicular sites. Soft tissue, skeletal, and dental treatment effects between two groups were compared using lateral cephalometric measurements. Results: The average angle between the cranial base and A point was 1.01 degrees (P =.004), and the linear distance between the upper incisor and A point was 2.67 to 5.2 millimetres (P =.00). In IZC group the maxillary incisor to the palatal plane moved upward by a mean of −5.20 mm (P =.059), whereas in IR group the incisor movement changed by −2.67 mm (P =.068). There was no significant difference between groups IZC and IR while comparing overall treatment changes on upper incisor position change, angle, and overjet. Conclusions: Mini‐implants placed in between the molar and premolar as well as the infrazygomatic crest can withstand the deepening of the bite during retraction. Mini‐implants in IZC are capable of causing intrusion of the anterior teeth and preventing intrusion of the molars, thereby providing absolute anchoring in all planes. Placement of the mini‐implants in the infrazygomatic crest resulted in more linear retraction. [ABSTRACT FROM AUTHOR]