Clinical outcomes of oral implant treatment -School of Dentistry, Otago(1989-2005)

Objective: The aim of the study was to evaluate the outcomes of oral implant treatment provided at the School of Dentistry, University of Otago from 1989 to 2005.

Methods: Oral implant patients (n=320) were identified and invited to attend for a clinical examination. Patient demographics were recorded and implant survival verified. Periodontal / peri-implant parameters included full mouth (FM) plaque scores, probing depths (PD) and bleeding on probing (BOP), while recession and width of keratinized attached gingiva (KAG) were measured around implants only. Radiographs were taken to evaluate bone loss around implants.

Results: 103 patients (216 implants), attended for examination. There were equal numbers of males and females with a mean age of 46.3 ± 15 years at the time of implant placement. 7% were current smokers, 37% former smokers and 56% non-smokers. 56% of implants were in the anterior region and 44% in the posterior region. 79% were Branemark implants, 10% Straumann, 6% Southern Implants and 4% others. 64% were restored with crowns, 19% bridges and 17% overdentures. The overall implant survival rate was 98.1% with 4 implants lost (1.9%) and 8 implants treated for peri-implantitis (3.8%). The mean PD around implants was 2.3 ± 0.6mm, mean recession was 0.5 ± 0.8mm and mean attachment level of 2.8 ± 0.9mm. PDs ³ 4mm with BOP were recorded around implants in 8.9% of patients, while a further 15.8% of patients had PDs ³ 4mm without BOP. The mean FM plaque score was 30% while mean plaque score around implants was 15.9%. 10.9% of patients had FMPDs ³ 4mm with BOP while a further 35 patients (34.6%) had FMPDs ³ 4mm without BOP.

Conclusion: Prevalence of peri-implant inflammation and implant survival rates in this group of patients appeared comparable to that reported in the literature.