Influence of periodontal ligament injury on initial stability for immediately loaded mini-implant.
- Author:
Hong-ning WANG
1
;
Dong-xu LIU
;
Chun-ling WANG
;
Tao LÜ
;
Hong LIU
;
Hong-ling WANG
Author Information
- Publication Type:Journal Article
- MeSH: Adult; Bicuspid; Dental Implants; Humans; Maxilla; Molar; Orthodontic Anchorage Procedures; Orthodontic Appliance Design; Periodontal Ligament; Tooth Root
- From: West China Journal of Stomatology 2009;27(2):224-236
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo evaluate the influence of periodontal ligament (PDL) injury on initial stability for immediately loaded mini-implant anchorage.
METHODSThe sample consisted of 153 adult patients with maxillary protrusion deformity. Guiding by the positioning device designed by Choi, 306 mini-implants were inserted by self-tapping in the upper right and left buccal areas between the first molars and second premolars. The mini-implants were divided into two groups according to CT scanning. The mini-implant was absolutely separated from PDL (group I), the mini-implant appeared to touch or overlay on PDL, but not contact to the adjacent roots (group II). If orthodontic force could be applied to the mini-implants for four months, the mini-implant was recorded as successful anchorage. After immediate loading for four months, the analyses were completed by SPSS 9.0 software.
RESULTSOf the 306 inserted mini-implants, 162 were absolutely separated from PDL, 136 appeared to touch or overlay on PDL, but not contact to the adjacent roots, and 8 were excluded from this study because of injury to the adjacent root. The success rates of group I and II were 87.0% and 65.4% respectively. There were significant differences in the success rates between the two groups (P<0.001). The differences between the two groups in distribution of the upper right and left area had statistical significance (P<0.05).
CONCLUSIONPDL injury is one of the main reasons leading to early loosening of the mini-implant.