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Volume 26 , Issue 5
September/October 2011

Pages 10791086

A 5-Year Follow-up of 80 Implants in 44 Patients Placed Immediately After the Lateral Trap-Door Window Procedure to Accomplish Maxillary Sinus Elevation Without Bone Grafting

I-Ching Lin, DDS/Anne Margaret Gonzalez, DDS, MS/Hsin-Ju Chang, DDS/Shou-Yen Kao, DDS, MHA, DMSc/Ta-Wei Chen, DDS

PMID: 22010092

Purpose: The present study was performed to evaluate the 5-year status of immediately placed implants subjected to maxillary sinus elevation without grafting. Materials and Methods: Implants were placed in 2004 and 2005. A minimum of 3 mm of residual bone height (RBH) was required. All implants were placed with a sinus elevation performed through a lateral approach by the trap-door, open-window method without placement of any grafting material. Regular follow-up included oral hygiene instruction, periodontal charting, panoramic radiographs, and cone beam computed tomographic scans. The gained bone height (GBH) in the sinus, peri-implant sulcus depth, and marginal bone loss were analyzed statistically. Results: Forty-four patients (26 men, 18 women) with an average age of 58 years received 80 implants, which were followed for 5 years after prosthesis delivery. No patients developed sinusitis or other complications leading to implant loss. The average RBH was 5.06 1.51 mm and the average intrasinus implant length was 7.77 1.69 mm. Survival rates for the implants were 100% after 2 and 5 years. Average GBH was 7.24 1.83 mm at 2 years (range, 3 to 12 mm) and 7.44 1.94 mm at 5 years (P > .05). The average peri-implant sulcus depths were 2.5 0.4 mm at 2 years and 3.1 0.5 mm at 5 years (P < .05). The mean peri-implant marginal bone loss was 1.3 0.3 mm at 2 years and 2.1 0.5 mm at 5 years (P < .05). Conclusions: New bone formation in the sinus was confirmed, and good survival of implants with maxillary sinus elevation by the lateral approach without grafting was observed after 5 years. Attention should be focused on oral hygiene maintenance to ensure peri-implant gingival health. Int J Oral Maxillofac Implants 2011;26:10791086

Key words: graft, implant, lateral approach, maxillary sinus, sinus elevation, survival

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