Accuracy of a self-perforating impression tray for dental implants.
BACKGROUND
Difficulties are involved in impression making with conventional open impression trays.


OBJECTIVE
The purpose of this study was to evaluate the accuracy of transferring implant impressions with a self-perforating impression tray.


METHODS
A reference model of a mandible was fabricated, and 4 implants were placed in the regions of the first premolars and lateral incisors (implants 1, 2, 3, 4). Ten impressions of the reference model with polyvinyl siloxane were made for each group; control (conventional open impression tray) and test (self-perforating impression tray; Miratray Implant). A metal bar was screw-retained on implant 1, and the gaps generated at the vestibular face of implants 3 and 4 were measured by optical microcopy. The 2-way ANOVA and least square difference post hoc test were used (α=.05).


RESULTS
Higher mean (±SD) values were obtained for the test group than for the control group for both implants: implant 3: 150 ±84 μm for the test group, 73 ±63 μm for the control group (P=.019); implant 4: 129 ±65 μm for the test group, 62 ±61 μm for the control group (P=.04).


CONCLUSIONS
The self-perforating impression tray provided less accuracy than the conventional open tray.
Doctoral student, Department of Prosthodontics, School of Dentistry, University of São Paulo; Doctoral student, Department of Prosthodontics and Biomaterials, University Hospital RWTH Aachen, Aachen, Germany. Electronic address: marotti@usp.br.
Juliana
J
Marotti
Professor, Department of Prosthodontics, School of Dentistry, University of São Paulo, São Paulo-SP, Brazil.
Pedro
P
Tortamano
Assistant, Department of Prosthodontics, School of Dentistry, University of São Paulo, São Paulo-SP, Brazil.
Tatiana R R N
TR
Castilho
Professor, Department of Restorative Dentistry, School of Dentistry, Nove de Julho University.
Washington
W
Steagall
Director and Chair of the Department of Prosthodontics and Biomaterials, University Hospital RWTH Aachen, Aachen, Germany.
Stefan
S
Wolfart
Assistant, Department of Prosthodontics and Biomaterials, University Hospital RWTH Aachen, Aachen, Germany.
Klaus
K
Haselhuhn
D002858:Chromium Alloys / Q000737:chemistry; D015921:Dental Implants; D003760:Dental Impression Materials / Q000737:chemistry; D003761:Dental Impression Technique / Q000295:instrumentation*; D018772:Dental Marginal Adaptation; D004867:Equipment Design; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008334:Mandible / Q000033:anatomy & histology; D008422:Materials Testing; D008953:Models, Anatomic; D009757:Nylons / Q000737:chemistry; D011145:Polyvinyls / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry; D012984:Software; D013499:Surface Properties; D014741:Video Recording
D002858:Chromium Alloys; D015921:Dental Implants; D003760:Dental Impression Materials; D009757:Nylons; D011145:Polyvinyls; D012833:Siloxanes; C034183:vinyl polysiloxane