Accuracy of Implant Surgical Stent with Different Storage Durations and Conditions
Date Issued
2010
Date
2010
Author(s)
Chen, Chia-Chun
Abstract
Objectives: An acrylic implant surgical guide stent may shrink during storage and affect the accuracy of implant surgery. The aim of this study was to investigate the accuracy of surgical stent after different durations in different storage conditions. Material and methods: Two implant replicas were placed at second premolar and second molar positions in four duplicated maxillary stone models with missing right second premolar and molars. Corresponding temporary cylinders were attached to the implant replicas and embedded into an acrylic stent fabricated on the model. Four stents were fabricated on each model and sixteen stents were divided into two storage conditions (70%, 100% humidity). Three ceramic balls were attached to each model and stent as markers for CT image-fusing-analysis. CT-images were taken immediate after stent fabrication and after 4 storage durations (1, 3, 7 days, 1month). The missing right posterior region was removed from the model and two corresponding implants were attached to the stent placed on the model before CT imaging. An image-fusing analyzing technique was used to analyze the changes of implant position and angle relative to the two sets of ceramic markers(model’s and stent’s respectively) after different storage durations. Two-way repeated measures ANOVA was used for statistics analysis. Results:
Using the ceramic balls of stents as markers for image-fusing-analysis, the changes of implant position and angle were measured. After storage durations of 1, 3, 7 days, and 1month in 100% humidity, the mean displacement of implant head was 0.085, 0.079, 0.081,and 0.097mm, respectively; the mean displacement of implant apex was 0.126, 0.144, 0.137, and 0.180mm, respectively; the angle deviation was 0.77, 0.91, 1.04, and 0.99 °, respectively. After storage durations of 1, 3, 7 days, and 1month in room humidity, the mean displacement of implant head was 0.078, 0.092, 0.082, and 0.094mm, respectively; the mean displacement of implant apex was 0.127, 0.152,0.137, and 0.184mm, respectively; the angle deviation was 0.87, 1.01, 0.99, and 1.07°, respectively. No statistically significant difference was found after different durations in two storage conditions. Using the ceramic balls of models as markers for image-fusing-analysis, the changes of implant position and angle were measured. After storage durations of 1, 3, 7 days, and 1month in 100% humidity, the mean displacement of implant head was 0.090, 0.091, 0.086,and 0.079mm, respectively; the mean displacement of implant apex was 0.142, 0.169, 0.163, and 0.150mm, respectively; the angle deviation was 0.78, 0.96, 1.06, and 0.84 °, respectively. After storage durations of 1, 3, 7 days, and 1month in room humidity, the mean displacement of implant head was 0.073, 0.093, 0.083, and 0.108mm, respectively; the mean displacement of implant apex was 0.138, 0.162, 0.149, and 0.184mm, respectively; the angle deviation was 0.95, 1.01, 1.01, and 1.09°, respectively. No statistically significant difference was found after different durations in two storage conditions. Neither was between two different sets of ceramic markers attached to models and stents, respectively. Conclusions: The data suggest the accuracy of acrylic surgical stents were maintained within 1 month in 70% and 100% humidity conditions.
Subjects
Implant
surgical stent
accuracy
Type
thesis
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