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Purpose: The present retrospective clinical study was undertaken to evaluate the survival rate and marginal bone conditions around Pivot Morse Line implants. The purpose was also to compare the results with when these implants are used for immediate/early loading where implants were allowed to heal and osseointegrate before loading.
Material and methods: Seventy-Seven consecutive patients who received implant treatment with 119 Pivot Morse line implants at two different centres were evaluated. The implants were placed in both maxilla and mandible for treatment after loss of single and multiple teeth. Immediate/early loading (within 2 weeks) with temporization was done to 85 implants, while 34 implants were allowed to heal for 8 to 24 weeks before loading. Marginal bone loss was calculated using radiographs taken at placement and after an average of 40 weeks (range 1–18 months) of loading.
Results: 13 (10.92%) of the 119 implants failed within 30 days of surgery. All the failed implants belonged to the immediate/early loading group which was 10.52% for the group whereas for the delayed loading failure rate was 0%. All the implants that failed were done using flapless protocol. The marginal bone loss was 2.7mm (SD 1.3) for all implants, while 51 implants (42%) showed more than 3mm of loss during the follow up. Bone loss was recorded to increase with time. Implants subjected to immediate / early loading showed more bone loss than two-stage implants. Moreover, 42% of immediately loaded and 12% of two-stage implants had more than 3mm of bone loss.
Conclusion: This short-term retrospective analysis showed a good clinical outcome of Pivot Morse Line implants. Marginal bone loss (6mm) was within limits and was found in around 33 of the evaluated implants. Less resorption and no failures were experienced when implants were left undisturbed and allowed to Osseointegrate for 8 – 24 weeks before occlusal loading. Within the limitations of the present study, data indicate that immediate loading and flapless surgeries are risk factors for failure of Pivot Morse Line implants.
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