Editorial Type:
Article Category: Research Article
 | 
Online Publication Date: 01 Aug 2017

Clips vs Resilient Liners Used With Bilateral Posterior Prefabricated Bars for Retaining Four Implant-Supported Mandibular Overdentures

BDS, MSD,
BDS, MSD, PhD,
BDS, MSD, PhD,
BDS, MSD, and
BDS, MSD, PhD
Page Range: 273 – 281
DOI: 10.1563/aaid-joi-D-16-00148
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The objective of this research was to clinically compare peri-implant tissue health of bar-clips vs silicone-resilient liners used with bilateral posterior bars for retaining 4 implant-supported mandibular overdentures. Thirty completely edentulous male patients (mean age, 65 years) were randomly assigned into 2 equal groups. Each patient received 4 implants in the canine and first molar regions of the mandible using a flapless surgical technique. Mandibular overdentures were immediately connected to the implants with bilateral prefabricated instant adjusting bars. According to the method of retention to the bar, 1 group was retained with clips (GI), whereas the other group was retained with a silicone-resilient soft liner (GII). Peri-implant tissue health was evaluated clinically in terms of plaque scores (MPI), bleeding scores (MBI), probing depth (PD), and implant stability (IS). MPI, MBI, and PD were measured at mesial, distal, buccal, and lingual surfaces of each implant. Evaluations were performed 2 weeks (T0), 6 months (T6), and 12 months (T12) after overdenture insertion. Implants of GI with clips demonstrated significant increase in plaque, bleeding, and PD scores compared with those of GII with silicone-resilient liner at all observation times. Implants in GI demonstrated a significant decrease in implant stability compared with those of GII at T6 and T12 anteriorly and at T12 posteriorly. Resilient liners are considered better than bar-clips when used with bilateral posterior bars for retaining implant-supported mandibular overdentures in terms of peri-implant soft tissue health. Bilateral posterior ready-made bars cannot be proposed as a promising design for supporting implant-assisted mandibular overdentures.

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  <sc>Figures 1–6.</sc>
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Figures 1–6.

Figure 1. Panoramic radiograph with stent intraoral to evaluate bone height at proposed implant positions. Figure 2. Panoramic radiograph with the four implants at their final position slightly under the crest. Figure 3. Bilateral instant adjusting bars tightened in position above instant adjusting bar abutments. Figure 4. The bar riders of both sides incorporated in the fitting surface of the overdenture. Figure 5. Silicone soft liner relined mandibular overdenture. Figure 6. Calibrated plastic periodontal probe used to measure probing depth.


Contributor Notes

Corresponding author: e-mail: monagibreel@mans.edu.eg
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