I In the field of dentistry, alginate molding material used to obtain a negative mold of the oral tissues. Alginate molding materials have properties that absorb water (imbibition) and shrinkage of the printed material. Alginate which has been printed in the oral cavity will cause cross-contamination of patients. Prevention of cross-contamination by using a povidone iodine solution can kill bacteria, fungi, viruses, and protozoa. Objective: to observe the effect of submersion length of the alginate mold in the povidone iodine solution towards the dimensional change of the alginate in the different time. Methods: This study was an experimental research laboratory study with in-vitro research plan. Water and alginate stirred with alginator. Then, poured into molds and used the vibrator. After setting, alginate is released from the mold and measured with calipers. It takes one mold at room temperature and three molds submersed in a povidone iodine solution in a predetermined time. Measure the alginate molds after submersed in predetermined time. Results: At 1 minute in room temperature, dimensional change of length, width, and height are 0,09 mm, 0,09 mm, and 0,07 mm. In the povidone iodine submersion, the dimensional change of length, width, height are 0,09 mm, 0,08 mm, and 0,07 mm. At 5 minutes in room temperature, the dimensional change of length, width, and height are 0,06 mm, 0,08 mm, and 0,05 mm. In the povidone iodine submersion, the dimensional change of length, width, and height are 0,62 mm, 0,06 mm, and 0,45 mm. At 10 minutes in room temperature, the dimensional change of length, width, and height are 0,14 mm, 0,12 mm, and 0,06 mm. In the povidone iodine submersion, the dimensional change of length, width, and height are 0,52 mm, 0,10 mm, and 0,50 mm. Conclusions: There are dimensional changes shown on the alginate impression thet were submerged in a 0,47% povidone iodine solution.