**2. Risk factors that contribute to implant failures**

The success of a dental implant depends primarily on the level of marginal bone loss, absence of mucosal inflammation, and probing depth. Risk factors that undermine the above criteria for long-term implant success should be explained to the patient and a comprehensive treatment plan must be presented to them. This comprehensive treatment plan must include all recommended dental therapy, possible alternative treatment options, the clinical risk which can be faced during the surgery, and the cost of the treatment. This discussion between the practitioner and the patient will help the patient understand why and how the procedure will be carried out.

Patient-specific risk assessment should include an extensive examination of the candidate and detailed medical and dental history. This will help the practitioner weigh the pre-operative and post-operative risks with implant placement. It is ideal and recommended to classify the implant patients according to their medical condition and associated co-morbidities using the American Society of Anesthesiologists Physical Status Classification System (ASA PS Classification) and co-relate their ASA PS status with the Type of dental treatment (**Table 1**) and their associated risk type (**Table 2**).


**Table 1.** *Type of dental treatments.* *The Dental Implant Maintenance DOI: http://dx.doi.org/10.5772/intechopen.101187*


**Table 2.**

*Inter-relationship between ASA PS classification, type of dental treatment, and risk of implant placement.*
