M Wafa Richi1, Sevcan Kurtulmus-Yilmaz2, Oguz Ozan2. 1. Department of Prosthodontics, Near East University Faculty of Dentistry, Lefkosa, Mersin10, Ankara, Turkey. wafa.richi1@gmail.com. 2. Department of Prosthodontics, Near East University Faculty of Dentistry, Lefkosa, Mersin10, Ankara, Turkey.
Abstract
BACKGROUND: There is no consensus in the literature regarding the impression procedures in the presence of multiple and angulated implants. METHODS: Three maxillary master models with 6 implants bilaterally positioned in anterior, premolar and molar regions were fabricated. In model 1, all implants were placed in parallel; in models 2 and 3, anterior implants were buccally inclined and posterior implants were distally inclined in 10- and 20-degrees, respectively. Three different impression copings (hexed, non-hex, multi-unit) and two different impression techniques (splinting and non-splinting) were tested. A total of 180 impressions (n = 10 per group) were made using mono-phase vinyl poly-siloxane. Master models and duplicate casts were scanned by a 5-axis laboratory scanner and data were transferred to a software program for the alignment of master and duplicate copings. Coronal and angular deviations were calculated, and data were statistically analyzed. RESULTS: For angulated models, the lowest deviation values were detected at the splinted non-hex coping group (P < 0.05). CONCLUSIONS: Implant angulation, impression coping type, and splinting the impression copings had significant effects on the accuracy of impressions. TRIAL REGISTRATION: Not applicable.
BACKGROUND: There is no consensus in the literature regarding the impression procedures in the presence of multiple and angulated implants. METHODS: Three maxillary master models with 6 implants bilaterally positioned in anterior, premolar and molar regions were fabricated. In model 1, all implants were placed in parallel; in models 2 and 3, anterior implants were buccally inclined and posterior implants were distally inclined in 10- and 20-degrees, respectively. Three different impression copings (hexed, non-hex, multi-unit) and two different impression techniques (splinting and non-splinting) were tested. A total of 180 impressions (n = 10 per group) were made using mono-phase vinyl poly-siloxane. Master models and duplicate casts were scanned by a 5-axis laboratory scanner and data were transferred to a software program for the alignment of master and duplicate copings. Coronal and angular deviations were calculated, and data were statistically analyzed. RESULTS: For angulated models, the lowest deviation values were detected at the splinted non-hex coping group (P < 0.05). CONCLUSIONS: Implant angulation, impression coping type, and splinting the impression copings had significant effects on the accuracy of impressions. TRIAL REGISTRATION: Not applicable.
Authors: António H J Moreira; Nuno F Rodrigues; António C M Pinho; Jaime C Fonseca; João L Vilaça Journal: Clin Implant Dent Relat Res Date: 2015-04-01 Impact factor: 3.932