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Ligature-induced peri-implant infection in crestal and subcrestal implants: a clinical and radiographic study in dogs.

Huang B, Piao M, Zhang L, Wang X, Xu L, Zhu W, Meng H - PeerJ (2015)

Bottom Line: Results.The alterations of peri-implant probing depths, clinical attachment levels, distances from the IAI to the first bone-implant contact (IAI-fBIC) and depths of infrabony defect were significant larger in the subcrestal groups compared with the crestal groups during the plaque accumulation period.Conclusion.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Oral Implantology, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University , Guangzhou , China ; Guangdong Provincial Key Laboratory of Stomatology , Guangzhou , China ; Department of Periodontology, Peking University School and Hospital of Stomatology , Beijing , China.

ABSTRACT
Objective. The aim of this study was to assess the influence of implant-abutment interface (IAI) placement depths on peri-implant tissues in the presence of ligature-induced peri-implant inflammation. Materials and Methods. Two implants with screwed-in IAIs (SI) and two implants with tapped-in IAIs (TI) were inserted in one side of the mandible in six dogs eight weeks after tooth extraction. Four experimental groups were constituted: SI placed crestally, SI placed 1.5 mm subcrestally, TI placed crestally and TI placed 1.5 mm subcrestally. After 12 weeks, the healing abutments were connected. Four weeks later, cotton floss ligatures were placed around the abutments to promote plaque accumulation. Clinical and radiographic examinations were performed at 0, 6 and 12 weeks after ligature placement. The effects of the IAI placement depths on clinical and radiographic parameters were assessed. Results. The alterations of peri-implant probing depths, clinical attachment levels, distances from the IAI to the first bone-implant contact (IAI-fBIC) and depths of infrabony defect were significant larger in the subcrestal groups compared with the crestal groups during the plaque accumulation period. The alterations of clinical attachment levels, IAI-fBIC, depth of the infrabony defect and horizontal bone loss were not significantly different between the SI and TI groups after ligature placement. Conclusion. Tissue destruction in subcrestal implants may be more serious than that in crestal implants in the presence of inflamed peri-implant mucosa.

No MeSH data available.


Related in: MedlinePlus

Outline of the study.
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fig-1: Outline of the study.

Mentions: Baseline clinical measurements were taken at the mesial and distal sites of each implant before placing the ligatures. Using a periodontal probe (UNC; Hu-Friedy, Chicago, Illinois, USA), the peri-implant probing depths (PD, distance from the gingival margin to the bottom of the sulcus/pocket) and clinical attachment levels (CAL, distance from fixed point in the abutment shoulder to the bottom of the sulcus/pocket) were measured. In addition, the modified plaque index (PI) (Mombelli et al., 1987) and bleeding index (BI) (Mazza, Newman & Sims, 1981) were measured. Clinical measurements were repeated at 6 and 12 weeks after ligature placement (Fig. 1). CALs were adjusted by the different abutment lengths among the groups. All clinical measurements were performed by one calibrated examiner.


Ligature-induced peri-implant infection in crestal and subcrestal implants: a clinical and radiographic study in dogs.

Huang B, Piao M, Zhang L, Wang X, Xu L, Zhu W, Meng H - PeerJ (2015)

Outline of the study.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4525689&req=5

fig-1: Outline of the study.
Mentions: Baseline clinical measurements were taken at the mesial and distal sites of each implant before placing the ligatures. Using a periodontal probe (UNC; Hu-Friedy, Chicago, Illinois, USA), the peri-implant probing depths (PD, distance from the gingival margin to the bottom of the sulcus/pocket) and clinical attachment levels (CAL, distance from fixed point in the abutment shoulder to the bottom of the sulcus/pocket) were measured. In addition, the modified plaque index (PI) (Mombelli et al., 1987) and bleeding index (BI) (Mazza, Newman & Sims, 1981) were measured. Clinical measurements were repeated at 6 and 12 weeks after ligature placement (Fig. 1). CALs were adjusted by the different abutment lengths among the groups. All clinical measurements were performed by one calibrated examiner.

Bottom Line: Results.The alterations of peri-implant probing depths, clinical attachment levels, distances from the IAI to the first bone-implant contact (IAI-fBIC) and depths of infrabony defect were significant larger in the subcrestal groups compared with the crestal groups during the plaque accumulation period.Conclusion.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Oral Implantology, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University , Guangzhou , China ; Guangdong Provincial Key Laboratory of Stomatology , Guangzhou , China ; Department of Periodontology, Peking University School and Hospital of Stomatology , Beijing , China.

ABSTRACT
Objective. The aim of this study was to assess the influence of implant-abutment interface (IAI) placement depths on peri-implant tissues in the presence of ligature-induced peri-implant inflammation. Materials and Methods. Two implants with screwed-in IAIs (SI) and two implants with tapped-in IAIs (TI) were inserted in one side of the mandible in six dogs eight weeks after tooth extraction. Four experimental groups were constituted: SI placed crestally, SI placed 1.5 mm subcrestally, TI placed crestally and TI placed 1.5 mm subcrestally. After 12 weeks, the healing abutments were connected. Four weeks later, cotton floss ligatures were placed around the abutments to promote plaque accumulation. Clinical and radiographic examinations were performed at 0, 6 and 12 weeks after ligature placement. The effects of the IAI placement depths on clinical and radiographic parameters were assessed. Results. The alterations of peri-implant probing depths, clinical attachment levels, distances from the IAI to the first bone-implant contact (IAI-fBIC) and depths of infrabony defect were significant larger in the subcrestal groups compared with the crestal groups during the plaque accumulation period. The alterations of clinical attachment levels, IAI-fBIC, depth of the infrabony defect and horizontal bone loss were not significantly different between the SI and TI groups after ligature placement. Conclusion. Tissue destruction in subcrestal implants may be more serious than that in crestal implants in the presence of inflamed peri-implant mucosa.

No MeSH data available.


Related in: MedlinePlus