To investigate the effect of alveolar ridge preservation technique on the aesthetic restoration of delayed implant after immediate extraction of anterior teeth.

A total of 20 patients (8 males and 12 females) were selected from the Stomatological Hospital Affiliated to Nanjing Medical University from 2016 to 2018. All patients were unable to retain the affected teeth in the aesthetic area and had serious bone defects. Aesthetic restorations of the anterior teeth were needed. Minimally invasive extraction of the anterior teeth was performed. Bone grafting and collagen membrane isolation were performed immediately after extraction to guide bone regeneration of the extraction socket and achieve site preservation. Six months later, the bone mass increment of alveolar ridge was measured by radiography, and implants were placed. The final restorations were completed 3-6 months after operation. The effects of implant restoration, including pink aesthetic index (PES) , white aesthetic index (WES) , width and height of alveolar ridge, were observed and analyzed by SPSS 16.0. All patients were followed up for 3 years.

The total mean value of PES/WES was 15.17 ± 3.2, while the mean value of PES and WES was 7.53 ± 1.68 and 7.64 ± 1.52, respectively. The average vertical absorption rate of peri-implant bone was less than 0.45 mm/year, and the aesthetic effect was satisfactory.

For the aesthetic area with serious bone defect, alveolar ridge preservation after tooth extraction can achieve good bone increment and maintain the width and height of alveolar ridge. Alveolar ridge preservation and delayed implantation after tooth extraction are reliable for implant succuss.