Influence of Oral Appliances for Mandibular Advancement on Dentitions Using a Strain Gauge Analysis: A Pilot Study

Table 2

Comparison of the strain on the first molars.

Recording period	Mean ± SD
	Site	Stretching strain	Compressive strain	Stretching versus compressive strains
Short	Upper molar	33.2 ± 26.3	31.1 ± 18.2	NS
	Lower molar	37.8 ± 33.3	21.7 ± 21.4	NS
Long	Upper molar	62.6 ± 27.0	46.3 ± 35.3	NS
	Lower molar	37.5 ± 19.4	60.5 ± 49.0	NS

.
NS = not significant.