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Journal of Oral Science & Rehabilitation No. 2, 2017

T w o i m p l a n t s s u p p o r t i n g a m a n d i b u l a r o v e r d e n t u r e Implants ≥ 4 mm wide Failed implant Failed prosthesis MBL mm) 2 0 0 2 2 2 0 0 1 9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.20 0.30 0.30 0.50 0.30 0.70 0.30 0.40 0.50 OHIP OHIP OHIP T0 69 78 83 68 65 80 74 72 76 T1 38 35 29 30 22 28 34 29 24 T2 26 21 21 16 22 24 22 18 18 Table 1 BI PI 1 2 0 0 0 3 0 0 0 0 2 0 1 0 4 0 0 0 8.3% 9.7% 0.39 ± 0.15 74 ± 6 30 ± 5 21 ± 3 ity, and handicap) with two to four questions each. Participants chose from five possible responses for each question as follows: never, hardly ever, occasionally, fairly often and very often. Items were scored on a five-point ordi- nal scale ranging from 1 (never) to 5 (very often). Lower OHIP total scores are suggestive of improvement in oral health-related quality of life. The questionnaire was administered before treatment and one month and one year after definitive prosthesis delivery. – Bleeding index and plaque index were evalu- ated at four sites around each implant- abutment interface at the one-year examina- tion with a periodontal probe (PCPUNC156, Hu-Friedy, Milan, Italy). An independent dentist evaluated the implant and prosthetic survival and success rates and administered the patient satisfaction and OHIP questionnaires. Complications were assessed and treated by the treating clinician, who was nonblinded. Marginal bone level changes were evaluated by an independent radiologist. An in- dependent blinded dental hygienist who was otherwise not involved in the study performed all of the periodontal measurements. All data analysis was carried out according to a pre-established analysis plan using software (IBM SPSS Statistics for Macintosh, Version 22.0, IBM, Armonk, N.Y., U.S.). Descriptive analysis was performed using means, standard deviations and a 95% confidence interval. Comparison of the means for marginal bone level changes, patient satisfaction and OHIP scores between the base- line and one-year follow-up examinations was performed by paired tests. A biostatistician with expertise in dentistry analyzed the data. Results A total of 18 Osstem TSIII implants of 8.5 mm (n = 2) or 10 mm (n = 16) in length and a regular diameter (n = 9) or mini diameter (n = 9) were placed in nine consecutive edentulous partici- pants (seven female and two male) presenting with Cawood and Howell Class V (n = 6) or VI (n = 3) mandibular atrophy. The participants were followed up for a minimum of one year (mean: 18.2 months; range: 12–22) after defini- tive loading. The average age of the patients was 68 (range: 53–77). The main patient and implant characteristics are shown in Table 1. No partici- pants dropped out, and no deviation from the original protocol occurred. At the one- year follow- up, no implants or prosthesis had failed, resulting in cumulative implant and prosthetic survival rates of 100%. No biological or techni- cal complications occurred during the follow-up, resulting in cumulative implant and prosthetic success rates of 100%. At the one-year follow- up, the mean marginal bone loss was 0.39 ± 0.15 mm. The OHIP summary scores demonstrated a significant decrease between the pre-treatment scenario and the one-month after prosthesis delivery (p = 0.0000) and be- tween the one-month and one-year follow- ups (p = 0.0005), after retention system replace- ment. At the one-year follow-up, the bleeding index was 8.3% and the plaque index was 9.7%. All of the data are summarized in Table 1. Journal of Oral Science & Rehabilitation Volume 3 | Issue 2/2017 57

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