Comparison of two impression techniques for auricular prosthesis: Pilot study

Abstract

Abstract-The purpose of this article was to compare the accuracy of a new impression technique, the triple-layer impression technique (TLIT), with the conventional impression technique (CIT) to fabricate an auricular prosthesis. Fifteen male subjects (aged 22-45 yr) were selected. Ten markings were made on the subject's ear (super aurale [sa], sub aurale [sba], pre aurale [pra], post aurale [poa], A, A1, B, B1, C, and C1) and five measurements (sa-sba, pra-poa, A-A1, B-B1, and C-C1) were made. Custom-made trays were used to record impression in CIT and TLIT. Impressions were made using alginate, and models were cast with type IV gypsum product. Markings were transferred on the cast. Measurements were rechecked on the models. Distribution analysis of difference in measurements between the two impression techniques and the subject's actual values was evaluated. Sign test was used to analyze the statistical significance. Statistically significant differences were found in measurements A-A1, B-B1, and C-C1 between the two techniques when compared with the subject's actual dimensions (p < 0.01). TLIT was found to produce accurate models when compared with CIT. The TLIT used in the study was cost effective, less technique sensitive, and tailor made to reduce chairside orientation time during wax try-in appointments for rehabilitating patients, especially those with unilateral auricular defects.

A systematic review on ear anthropometry and its industrial design applications

“…Ear impression is an option for collecting detailed information of both the ear canal and pinna. The stone casting was used to acquire almost a full representation model of the auricle, except for the ear canal (Coward & Scott, 2005; Mohamed, Mani, Seenivasan, Vaidhyanathan, & Veeravalli, 2013). Silicone molding was applied to represent the surface of the ear canal particularly (Chiou et al, 2016; Ji et al, 2018).…”

Pembuatan Prothesa Telinga dengan Metode Pencetakan Tiga Lapis

“…Teknik pencetakan konvensional menggunakan satu lapisan bahan cetak yang dituang dalam waktu yang sama, akibatnya terjadi distorsi bentuk telinga akibat pembebanan bahan cetak. Menurut Mohamed dkk., 5 distorsi hasil cetakan dengan teknik konvensional terjadi pada regio helix dan antihelix.…”

“…Teknik pencetakan yang dapat diaplikasikan dalam pembuatan prothesa telinga diantaranya metode dua cetakan dengan bahan cetak plaster, reversible hydrocolloid dengan sendok cetak malam, irreversible hydrocolloid dengan sendok cetak kaku dan metode pencetakan tiga lapis. 5 Metode pencetakan tiga lapis menggunakan bahan cetak irreversible hydrocolloid yang diaplikasikan dalam tiga tahapan berbeda sehingga meningkatkan keakuratan hasil cetakan. Keunggulan teknik pencetakan tiga lapis adalah mudah dilakukan dan akurasi hasil pencetakan yang baik.…”

Digital surgical planning and placement of osseointegrated implants to retain an auricular prosthesis using implant software with cone‐beam computed tomography and 3D‐printed surgical guides: A case report

“…Both acceptable 1,3,4,[6][7][8][9][10][11][12][13] and suboptimal outcomes have been reported. 6 Conventional analog approaches used to fabricate implant-retained auricular prostheses involve making a conventional impression of the affected and unaffected ear sites (using the intact ear as an indirect template), 7,14 fabrication of a gypsum-product master cast, 7,[15][16][17] and production of a wax pattern, 7,14,17 used to fabricate the definitive prosthesis via conventional flasking, wax-elimination, and molding and curing of the prosthesis, commonly using silicone. Various modifications of this conventional technique have been described with the objective of overcoming technique-sensitivity hurdles, such as tissue movement, 16 accurate reproduction of convoluted auricular anatomic dimensions with severe undercuts, 14 and impression distortion.…”

“…Various modifications of this conventional technique have been described with the objective of overcoming technique-sensitivity hurdles, such as tissue movement, 16 accurate reproduction of convoluted auricular anatomic dimensions with severe undercuts, 14 and impression distortion. 17,18 Acquisition of similar ear anatomy via an impression from an individual other than the patient to create a wax pattern for fabricating the prosthesis has also been described. 14 The co-evolution of digital planning and design with temporally placed osseointegrated implants has improved auricular replacement workflows and outcomes.…”