Systematic Review and Meta-Analysis on Incidence of Altered Sensation of Mandibular Implant Surgery

Chia-Shu Lin, Shih-Yun Wu, Hsin-Yi Huang, Yu-Lin Lai, Chia-Shu Lin, Shih-Yun Wu, Hsin-Yi Huang, Yu-Lin Lai

Abstract

Altered sensation (including paresthesia, dysesthesia and hypoesthesia) after mandibular implant surgery may indicate transient or permanent injury of the inferior alveolar nerve and the mental branch, and considerably lower patients' satisfaction about the therapy. Previous studies have shown a great degree of variability on the incidence of altered sensation. We here reported the incidence of altered sensation after mandibular implant surgery based on a meta-analysis of 26 articles published between 1990.1.1 and 2016.1.1. Study quality and risk of bias was assessed and the studies with a lower score were excluded in the meta-analysis. Data synthesis was performed using the logistic-normal random-effect model. The meta-analyses revealed that the short-term (10 days after implant placement) and long-term (1 year after implant placement) incidence was 13% (95% CI, 6%-25%) and 3% (95% CI, 1%-7%), respectively. (2) For the patients who initially reported altered sensation, 80% (95% CI, 52%-94%) of them would return to normal sensation within 6 months after surgery, and 91% (95% CI, 78%-96%) of them would return to normal sensation one year after surgery. We concluded that dentist-patient communication about the risk of altered sensation is critical to treatment planning, since the short-term incidence of altered sensation is substantial (13%). When a patient reports altered sensation, regular assessment for 6 months would help tracing the changes of symptoms. In terms of long-term follow-up (1 year after surgery), the incidence is much lower (3%) and most patients (91%) would return to normal sensation.

Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

Figures

Fig 1. Flow diagram describing the process…
Fig 1. Flow diagram describing the process of review and study selection.
Fig 2. Forest plots of the incidence…
Fig 2. Forest plots of the incidence of altered sensation.
(A) The short-term (within 10 days after surgery) incidence. (B) The long-term (1 year after surgery) incidence.
Fig 3. Recovery rate of altered sensation.
Fig 3. Recovery rate of altered sensation.
(A) The incidence of altered sensation through the duration of follow up. All the studies have assessed the occurrence of altered sensation for at least two different time points, according to the outcomes presented in Table 4. Study IDs of the included studies are shown in the legend. (B) The forest plot for the recovery rate, when recovery duration ≦ 6 months. (C) The forest plot for the recovery rate, when recovery duration = 1 year.

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