Affiliation:
1. Department of Orthodontics, Saveetha Dental College, Saveetha Institute of Medical and Technical Science Saveetha University Chennai India
2. Department of Orthodontics, School of Dentistry, Wonkwang Dental Research Institute University of Wonkwang Iksan South Korea
3. Postgraduate Orthodontic Program, Arizona School of Dentistry and Oral Health A.T. Still University Mesa Arizona USA
Abstract
AbstractIntroductionThe objective of this prospective study was to examine the efficacy of posterior interradicular and infrazygomatic crest mini‐implants for en‐masse anterior retraction.MethodsThe 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.ResultsThe 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.ConclusionsMini‐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.
Subject
Otorhinolaryngology,Oral Surgery,Surgery,Orthodontics