You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Polymerization shrinkage by volume was overcome by adding: and explain in detail?
Advantages of adding fillers:

Reduces the coefficient of thermal expansion
Reduces polymerization shrinkage
Increases abrasion resistance
Decreases water sorption
Increases tensile and compressive strengths
Increases fracture toughness
Increases flexure modulus
Provides radiopacity
Improves handling properties
Increases translucency

Ref: Textbook of Operative Dentistry, Nisha and Amit Garg, 3rd edition, Pg no:253