Huang Baoxin, Meng Huanxin, Zhu Weidong, Witek Lukasz, Tovar Nick, Coelho Paulo G
Department of Periodontology, Peking University School and Hospital of Stomatology, Beijing, China.
Department of Oral Implantology, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China.
Clin Oral Implants Res. 2015 Aug;26(8):942-949. doi: 10.1111/clr.12384. Epub 2014 Apr 10.
To evaluate the influence of implant-abutment interface (IAI) placement depth on bone remodeling around implants with two different types of tapered internal IAI: screwed-in (SI) and tapped-in (TI) connections in dogs.
Eight weeks post mandibular tooth extraction in six beagle dogs, two SI implants (OsseoSpeed(™), Astra Tech, DENTSPLY) and two TI implants (Integra-CP(™), Bicon LLC) were placed in one side of the mandible. The four experimental groups were as follows: (i) SI-placed equicrestally (SIC); (ii) TI-placed equicrestally (TIC); (iii) SI-placed 1.5 mm subcrestally (SIS); and (iv) TI-placed 1.5 mm subcrestally (TIS). Healing abutments were connected 12 weeks after implant placement. Sixteen weeks later, the dogs were sacrificed and histomorphometric analysis was performed. Histometrical outcomes were evaluated using a nonparametric Brunner-Langer model.
Mean distance from the IAI to first bone-implant contact (IAI-fBIC) was 0.88 mm (median: 0.77; SD: 0.54) for SIC group, 1.23 mm (median: 1.22; SD: 0.66) for TIC group, 0.41 mm (median: 0.31; SD: 0.36) for SIS group, and 0.41 mm (median: 0.26; SD: 0.45) for TIS group. Subcrestal groups showed lower IAI-fBIC compared with equicrestal groups (P < 0.001). Connective tissue presented similar measurements regardless of the IAI placement depth and IAI type (P > 0.05), but the epithelium length and peri-implant soft tissue length in subcrestal groups were significant larger than that in the equicrestal groups (P < 0.001 and P = 0.004, respectively).
Subcrestal implant placement with tapered internal IAI is beneficial for bone contact with the implant neck, and concurrently, it may not increase the soft tissue inflammation around IAI.
在犬类中评估种植体-基台界面（IAI）放置深度对两种不同类型的锥形内部IAI（旋入式（SI）和拧入式（TI）连接）种植体周围骨重塑的影响。
6只比格犬下颌牙齿拔除8周后，在一侧下颌骨植入2枚SI种植体（OsseoSpeed(™)，Astra Tech，登士柏）和2枚TI种植体（Integra-CP(™)，Bicon LLC）。四个实验组如下：（i）SI种植体等嵴顶放置（SIC）；（ii）TI种植体等嵴顶放置（TIC）；（iii）SI种植体牙槽嵴顶下1.5 mm放置（SIS）；（iv）TI种植体牙槽嵴顶下1.5 mm放置（TIS）。种植体植入12周后连接愈合基台。16周后，处死犬只并进行组织形态计量分析。组织计量学结果采用非参数Brunner-Langer模型进行评估。
SIC组从IAI到首次骨-种植体接触（IAI-fBIC）的平均距离为0.88 mm（中位数：0.77；标准差：0.54），TIC组为1.23 mm（中位数：1.22；标准差：0.66），SIS组为0.41 mm（中位数：0.31；标准差：0.36），TIS组为0.41 mm（中位数：0.26；标准差：0.45）。牙槽嵴顶下组的IAI-fBIC低于等嵴顶组（P < 0.001）。无论IAI放置深度和IAI类型如何，结缔组织测量结果相似（P > 0.05），但牙槽嵴顶下组的上皮长度和种植体周围软组织长度显著大于等嵴顶组（分别为P < 0.001和P = 0.004）。
采用锥形内部IAI进行牙槽嵴顶下种植有利于骨与种植体颈部接触，同时，可能不会增加IAI周围的软组织炎症。
