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BACKGROUND: Recently, the number of implants placed worldwide has increased tremendously, so as the prevalence of peri-implant complications. AIM: This cross-sectional study aimed to determine the prevalence of peri-implant diseases and technical complications of the implant-supported single crown (ISC) in the population of Kedah State, Malaysia. The characteristics of patients and implants associated with the peri-implant diseases were also explored. MATERIALS AND METHODS: All the patients who received an ISC between January 2008 and December 2016 at a public periodontal clinic and had a loading time between 2 and 10 years were identified. Their medical and radiographic records were examined. A patient and implant-based prevalence analysis of peri-implant diseases and complications were conducted. RESULTS: Twenty-three patients with a total of 43 implants were included in the analysis. Most of the patients were under 65 years of age (69.6%). The prevalence of peri-mucositis and peri-implantitis at the patient's level were both 30.4%. They respectively involved 20.9% and 18.6% of the implants. Poor oral hygiene at the time of last follow-up showed a significant association with the peri-implant diseases. However, the roles of the implants characteristics were insignificant. No implants failed after the placement of a supra-structure, while 3 implants (7%) were reported to have technical complications. CONCLUSIONS: The complications of ISC took placed in a considerable proportion of the studied population during long-term follow-up. As the poor plaque control proved to be the major risk factor of peri-implant diseases, strategies to improve their awareness of oral hygiene are warranted. [ABSTRACT FROM AUTHOR]