الفهرس 
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Abstract
Six completely edentulous male patients aged between 57- 72 years were selected for this study from the Prosthodontic Department in the Faculty of Dentistry, Mansoura University.
This study aimed to evaluate the peri-implant tissue health changes of immediately loaded implants supporting mandibular overdenture retained with bilateral prefabricated bars.
For each patient diagnostic digital panoramic radiograph was made to evaluate the alveolar bone at proposed implant positions and to detect the proper implant length. After maxillary and mandibular impressions, jaw relation records and try in, complete denture was constructed and adjusted for every patient. An acrylic template was constructed and four holes were drilled in the ideal positions for implant insertion (2 holes at canine regions and 2 holes in the first molar areas) to be used as a surgical guide for implants placement.
For each patient, four Acid etched Roughened Titanium screw type implant fixtures were surgically inserted in the canine and first molar areas. Bar abutments were screwed into their fixtures. Two abutments on each side were splinted with a pre-fabricated Instant Adjusting Bar. Within 24 hours after surgery, two riders for each Instant Adjusting bar were incorporated in the fitting surface of the mandibular overdenture directly in patient mouth. The peri-implant tissue health was investigated in the aspects of peri-implant probing depth, peri-implant bleeding index, peri-implant plaque index and implant mobility three and six months after insertion of definitive mandibular overdenture.
The results of this study revealed that:
1. In all periods of the present study, the probing depth was found to be less than 3 mm around immediately loaded posterior implants supporting mandibular overdenture retained by bilateral prefabricated bar.
2. The plaque accumulation around implants was observed to be increased significantly at the end of the first three months of the present study then decreased during the second three months.
3. The bleeding on probing of the soft tissues surrounding the immediately loaded implants supporting mandibular overdenture retained by bilateral prefabricated bar showed a slight increase at the end of first three months of study then decreased during the second three months of study.
4. All immediately loaded implants supporting mandibular overdenture retained by bilateral prefabricated bar exhibited no mobility three months after insertion. After six months of overdenture insertion, all anterior implants and 58.4% of posterior implants exhibited no mobility, while 41.6% of posterior implants exhibited mobility.
Conclusion: Regarding the peri-implant tissue health, splinting of immediately loaded implants with bilateral prefabricated posterior bar for retaining mandibular overdenture cannot be considered as a successful prosthetic approach for completely edentulous patient. Although splinting, the implants in the posterior region of the mandible cannot be proposed as a promising abutment for supporting mandibular overdenture retained with bilateral prefabricated bar.
Recommendation: Further elongated study with more investigation methods is recommended for evaluating this type of treatment modality.