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Mini-implant anchorage for en-masse retraction of maxillary anterior teeth: a clinical cephalometric study.
Am J Orthod Dentofacial Orthop. 2008 Dec; 134(6):803-10.AJ

Abstract

INTRODUCTION

This study was conducted to determine the efficiency of mini-implants as intraoral anchorage units for en-masse retraction of the 6 maxillary anterior teeth when the first premolars are extracted compared with conventional methods of anchorage reinforcement.

METHODS

Thirty patients requiring high anchorage after extraction of the maxillary first premolars were selected for this study. They were divided into 2 groups of 15 each. In the first group (G1), mini-implants were used for en-masse retraction; in the second group (G2), conventional methods of anchorage preservation were followed. Horizontal, vertical, and angular positions of the maxillary first molar and central incisor were evaluated cephalometrically before and after orthodontic retraction.

RESULTS

The maxillary first molars in the G1 patients showed net distal movement of 0.55 mm, and mesial movement of 1.95 mm was found in G2. The differences were statistically significant. Distal tipping of the first molar of -0.13 degrees+/-3.63 degrees was seen in G1, and mesial tipping of 3.7 degrees+/-3.9 degrees was observed in G2. No significant differences were found in the rates of incisor retraction between the 2 groups. However, G1 showed more than 2 mm of incisor intrusion; this was statistically significant.

CONCLUSIONS

Mini-implants are efficient for intraoral anchorage reinforcement for en-masse retraction and intrusion of maxillary anterior teeth. No anchorage loss was seen in either the horizontal or the vertical direction in G1 when compared with G2. However, a statistically significant decrease in intermolar width was noted in G1.

Authors+Show Affiliations

Division of Orthodontics, Department of Craniofacial Sciences, School of Dental Medicine, University of Connecticut, Farmington, CT 06030, USA. madhurup@yahoo.comNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

19061808

Citation

Upadhyay, Madhur, et al. "Mini-implant Anchorage for En-masse Retraction of Maxillary Anterior Teeth: a Clinical Cephalometric Study." American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, vol. 134, no. 6, 2008, pp. 803-10.
Upadhyay M, Yadav S, Patil S. Mini-implant anchorage for en-masse retraction of maxillary anterior teeth: a clinical cephalometric study. Am J Orthod Dentofacial Orthop. 2008;134(6):803-10.
Upadhyay, M., Yadav, S., & Patil, S. (2008). Mini-implant anchorage for en-masse retraction of maxillary anterior teeth: a clinical cephalometric study. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 134(6), 803-10. https://doi.org/10.1016/j.ajodo.2006.10.025
Upadhyay M, Yadav S, Patil S. Mini-implant Anchorage for En-masse Retraction of Maxillary Anterior Teeth: a Clinical Cephalometric Study. Am J Orthod Dentofacial Orthop. 2008;134(6):803-10. PubMed PMID: 19061808.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Mini-implant anchorage for en-masse retraction of maxillary anterior teeth: a clinical cephalometric study. AU - Upadhyay,Madhur, AU - Yadav,Sumit, AU - Patil,Sameer, PY - 2006/08/01/received PY - 2006/10/01/revised PY - 2006/10/01/accepted PY - 2008/12/9/pubmed PY - 2009/1/16/medline PY - 2008/12/9/entrez SP - 803 EP - 10 JF - American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics JO - Am J Orthod Dentofacial Orthop VL - 134 IS - 6 N2 - INTRODUCTION: This study was conducted to determine the efficiency of mini-implants as intraoral anchorage units for en-masse retraction of the 6 maxillary anterior teeth when the first premolars are extracted compared with conventional methods of anchorage reinforcement. METHODS: Thirty patients requiring high anchorage after extraction of the maxillary first premolars were selected for this study. They were divided into 2 groups of 15 each. In the first group (G1), mini-implants were used for en-masse retraction; in the second group (G2), conventional methods of anchorage preservation were followed. Horizontal, vertical, and angular positions of the maxillary first molar and central incisor were evaluated cephalometrically before and after orthodontic retraction. RESULTS: The maxillary first molars in the G1 patients showed net distal movement of 0.55 mm, and mesial movement of 1.95 mm was found in G2. The differences were statistically significant. Distal tipping of the first molar of -0.13 degrees+/-3.63 degrees was seen in G1, and mesial tipping of 3.7 degrees+/-3.9 degrees was observed in G2. No significant differences were found in the rates of incisor retraction between the 2 groups. However, G1 showed more than 2 mm of incisor intrusion; this was statistically significant. CONCLUSIONS: Mini-implants are efficient for intraoral anchorage reinforcement for en-masse retraction and intrusion of maxillary anterior teeth. No anchorage loss was seen in either the horizontal or the vertical direction in G1 when compared with G2. However, a statistically significant decrease in intermolar width was noted in G1. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/19061808/Mini_implant_anchorage_for_en_masse_retraction_of_maxillary_anterior_teeth:_a_clinical_cephalometric_study_ DB - PRIME DP - Unbound Medicine ER -