What I'm about to say is purely theoretical and empirical; there are no randomized studies to back it up. If it convinces you, follow it; if not, simply ignore it
Okay, let's look at this study because it's very interesting: "Use of a Modified Expander During Rapid Maxillary Expansion in Adults: An In Vitro and Finite Element Study." In this study, they used the skulls of 70-year-old women with a completely closed midpalatal suture (confirmed by CBCT, although it's often still slightly open, as CBCT isn't precise, but it gives me a preliminary picture of the suture's condition). A Hyrax device was used, but instead of attaching it to the teeth, they did something clever: they cut off its ends, then placed it on the midpalatal suture and secured it with very small screws (not like MSE, just small screws as a method of fixation). Then they activated the device 0.2 mm every 20 seconds for four activations, meaning the force gradually increased until the suture was completely separated. However, the force required to fully open the suture was only 85 N (the opening was confirmed by CBCT). Now look at the image below; you'll see that the force The tension is very localized, almost at the mid-palatal suture. Now, this is very interesting, so the idea is as follows: First, you must perform thumb pulling correctly (the thumbs must be very close to the suture, as I explained last time, so that the force is concentrated directly on the mid-palatal suture).
Then, do a very long round, 1-3 minutes, at full force. The combined force of the thumbs will be at least 200N, which is much higher than in the study. It's true that some force will be absorbed by the soft tissues, but it will be very small, and we will closely mimic the device they used in the study. Also, according to this source: "Development of a novel histological and histomorphometric evaluation protocol for a standardized description of the mid-palatal suture - An ex vivo study"
Individuals aged 70 had a tightly packed suture with few blood vessels, while young adults aged 20-30 had a much wider mid-palatal suture with many blood vessels. In short... In our case, the suture in the study was almost completely closed, but ours is still almost completely open, meaning the force needed to open it is much less. It's literally impossible not to be able to open the suture in the middle of your palate using your thumbs (provided both thumbs are directly next to the suture). What I'm trying to say is that at the beginning of each day, do a long thumb-pulling session (1-3 minutes) with maximum force, and then for the rest of the day do short sessions of 5-10 seconds to provide strong, periodic stimulation for suture growth.
According to this study “ https://pmc.ncbi.nlm.nih.gov/articles/PMC4430698/“ even one thumb can give more than 110n in lateral pulling
Okay, let's look at this study because it's very interesting: "Use of a Modified Expander During Rapid Maxillary Expansion in Adults: An In Vitro and Finite Element Study." In this study, they used the skulls of 70-year-old women with a completely closed midpalatal suture (confirmed by CBCT, although it's often still slightly open, as CBCT isn't precise, but it gives me a preliminary picture of the suture's condition). A Hyrax device was used, but instead of attaching it to the teeth, they did something clever: they cut off its ends, then placed it on the midpalatal suture and secured it with very small screws (not like MSE, just small screws as a method of fixation). Then they activated the device 0.2 mm every 20 seconds for four activations, meaning the force gradually increased until the suture was completely separated. However, the force required to fully open the suture was only 85 N (the opening was confirmed by CBCT). Now look at the image below; you'll see that the force The tension is very localized, almost at the mid-palatal suture. Now, this is very interesting, so the idea is as follows: First, you must perform thumb pulling correctly (the thumbs must be very close to the suture, as I explained last time, so that the force is concentrated directly on the mid-palatal suture).
Then, do a very long round, 1-3 minutes, at full force. The combined force of the thumbs will be at least 200N, which is much higher than in the study. It's true that some force will be absorbed by the soft tissues, but it will be very small, and we will closely mimic the device they used in the study. Also, according to this source: "Development of a novel histological and histomorphometric evaluation protocol for a standardized description of the mid-palatal suture - An ex vivo study"
Individuals aged 70 had a tightly packed suture with few blood vessels, while young adults aged 20-30 had a much wider mid-palatal suture with many blood vessels. In short... In our case, the suture in the study was almost completely closed, but ours is still almost completely open, meaning the force needed to open it is much less. It's literally impossible not to be able to open the suture in the middle of your palate using your thumbs (provided both thumbs are directly next to the suture). What I'm trying to say is that at the beginning of each day, do a long thumb-pulling session (1-3 minutes) with maximum force, and then for the rest of the day do short sessions of 5-10 seconds to provide strong, periodic stimulation for suture growth.
According to this study “ https://pmc.ncbi.nlm.nih.gov/articles/PMC4430698/“ even one thumb can give more than 110n in lateral pulling
