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"Evaluation of crestal bone loss around straight and tilted implants in patients rehabilitated by immediate-loaded full-arch. A prospective study.

The aim of this prospective study was to compare implant success rate and crestal bone loss around tilted and straight implants supporting immediate loading full-arch rehabilitations. Twenty consecutive patients with edentulous jaws treated between June 2013 and July 2015 that satisfy all inclusion and exclusion criteria were included in the study. All patientswere rehabilitated through a full-arch restoration supported by four or six immediately loaded implants.Clinical and radiographic examinations were scheduled every 12 months to evaluate implant success rates and crestal bone levels. Significant differences in crestal bone levels and success rates between straight and tilted implants were investigated by means of independent statistical analysis and differences were regarded as significant if p < 0.05.70 straight and 50 tilted implants were placed to rehabilitate 14 mandibles and 12 maxillae in 20 patients. After a follow-up of 12 to 36 months, survival rate was 97.1% for straight implants and 96.0% for tilted implants; while success rate were 94.3% and 94.0%, respectively. Both success and survival rates were not significantly different (P>0.05). A 0.5 ± 0.4 mm changes in crestal bone level was recorded for straight implants, while that of tilted implants was 0.6 ± 0.4 mm (P>0.05).Straight and tilted implants seem to have similar behavior after immediate loading rehabilitations. After functional loading, straight and tilted implants do not differ significantly as far as their clinical outcome is concerned.