IADR Abstract Archives
Magnification of Iris Through Clear Acrylic Resin in Ocular Prosthesis
Objectives: To investigate the magnification of the iris with various thicknesses of clear heat cure acrylic resin in the ocular prosthesis.
Methods: A total of 60 ocular prostheses were equally divided into six groups consisting of the ocular prosthesis with various thicknesses of clear heat cure acrylic resin (polymethyl methacrylate) over the iris; T0: control consisting of no acrylic resin over the iris, T1: 2 mm, T2: 4 mm, T3: 6 mm, T4: 8 mm, and T5: 10 mm thickness clear acrylic resin over the iris. Dental molds were prepared with dental stones. In each ocular prosthesis, some portions of acrylic at the center of the white acrylic prosthesis were removed (varying thickness) and 10.250 mm iris was placed. Then, the clear hear cure, at the dough stage, was placed over the iris according to the various thicknesses of clear acrylic removed on each prosthesis and allowed to hear cure. Following curing, the ocular prostheses were polished properly, and the diameter of the iris was measured with a vernier caliper (Mitutoyo Co., Kanagawa, Japan) in each ocular prosthesis in different groups. Analysis was done using SPSS 20. One-way ANOVA was done to compare the various sizes of iris in different groups and a significant level was chosen at P-value = 0.01.
Results: The mean size of iris for different groups were T0 (0 mm) = 10.255 ±0.039 mm, T1 (2 mm) = 10.925 ±0.054 mm, T2 (4 mm) = 11.267 ±0.083 mm, T3 (6 mm) = 11.907 ± 0.092 mm, and T4 (8 mm) = 12.749 ±0.094 mm, T5 (10 mm) = 13.434 mm ±0.066 mm. There was significant difference among the size of the iris (P <0.0001). The difference of iris size for different groups from the control were as 0.67 mm for T1, 1.012 mm for T2, 1.652 mm for T3, 2.494 mm for T4, 3.179 mm for T5. The magnification of iris for different groups were as 1.065x for T1 (2 mm), 1.098x for T2 (4 mm), 1.161x for T3 (6 mm), 1.243x for T4 (8 mm), 1.310x for T5 (10 mm).
Conclusions: As the thickness of clear heat cure acrylic resin over the iris is increased on the ocular prosthesis, the magnification of the iris is also increased. This research will provide guidelines on the magnification or iris with the thickness of clear acrylic resin and help to reduce the error in the size of the iris while fabrication and relining/adjustment of the ocular prosthesis.
Methods: A total of 60 ocular prostheses were equally divided into six groups consisting of the ocular prosthesis with various thicknesses of clear heat cure acrylic resin (polymethyl methacrylate) over the iris; T0: control consisting of no acrylic resin over the iris, T1: 2 mm, T2: 4 mm, T3: 6 mm, T4: 8 mm, and T5: 10 mm thickness clear acrylic resin over the iris. Dental molds were prepared with dental stones. In each ocular prosthesis, some portions of acrylic at the center of the white acrylic prosthesis were removed (varying thickness) and 10.250 mm iris was placed. Then, the clear hear cure, at the dough stage, was placed over the iris according to the various thicknesses of clear acrylic removed on each prosthesis and allowed to hear cure. Following curing, the ocular prostheses were polished properly, and the diameter of the iris was measured with a vernier caliper (Mitutoyo Co., Kanagawa, Japan) in each ocular prosthesis in different groups. Analysis was done using SPSS 20. One-way ANOVA was done to compare the various sizes of iris in different groups and a significant level was chosen at P-value = 0.01.
Results: The mean size of iris for different groups were T0 (0 mm) = 10.255 ±0.039 mm, T1 (2 mm) = 10.925 ±0.054 mm, T2 (4 mm) = 11.267 ±0.083 mm, T3 (6 mm) = 11.907 ± 0.092 mm, and T4 (8 mm) = 12.749 ±0.094 mm, T5 (10 mm) = 13.434 mm ±0.066 mm. There was significant difference among the size of the iris (P <0.0001). The difference of iris size for different groups from the control were as 0.67 mm for T1, 1.012 mm for T2, 1.652 mm for T3, 2.494 mm for T4, 3.179 mm for T5. The magnification of iris for different groups were as 1.065x for T1 (2 mm), 1.098x for T2 (4 mm), 1.161x for T3 (6 mm), 1.243x for T4 (8 mm), 1.310x for T5 (10 mm).
Conclusions: As the thickness of clear heat cure acrylic resin over the iris is increased on the ocular prosthesis, the magnification of the iris is also increased. This research will provide guidelines on the magnification or iris with the thickness of clear acrylic resin and help to reduce the error in the size of the iris while fabrication and relining/adjustment of the ocular prosthesis.