| Objective:This prospective study was performed to observe the correlation between the mesial papilla's height of single implant-supported Maxillary central incisor and the distance from the base of the contact point to the alveolar crest.Material and Methods:56 patients involved in single implant-supported maxillary central incisor were included in the study. The distance from the base of the contact point to the alveolar crest in the digital periapical film of Maxillary central incisor were measured using the software Planmeca Dimaxis Version3.3.2. The time of measurements were as follows: 1) the pre-surgical and post-surgical periods, 2)before and after the crown installation. 3)the follow-up examination of more than 0.5 year. To analyze the factors that influence the distance,and the correlation between the distance and the height of gingival papilla during the whole restored period . Correlation analysis between the distance and the height of gingival papilla during the whole restoration was done by the statistical software Spss12.0.Results:The results demonstrated that the ratio of esthetic papilla can achieve 45.5% at the crown installation and 95.5% at the follow-up examination when the distance was between 3mm and 5mm.When the distance was between 5mm and 6mm, they dropped to 30% and 75%, respectively. However, when the distance increased to above 7mm, the papilla can hardly be in a esthetic outcome. There was a significant change of the distance was found during the periods from the post-surgery to pre-restoration, and the scope of the changes was between -0.13mm and 0.46 mm.. A negative correlation was found between the distance and the index of papilla. The correlation coefficient r was -0.715 (P<0.01).Conclusions:It is proposed that the pre-surgery distance of maxillary central incisor from the base of the contact point to the alveolar crest can be used as one of the important reference indexes to assess and predict the height conditions of gingival papilla.
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