Sonuc:: SRME ve RME protokollerinin kisa donemde farkli etkilerinin bulunmaktadir ancak retansiyon donemi sonunda bu farkliliklar ortadan kalkmaktadir.
The interval of the expansion screw's activation, magnitude of the force, treatment duration and the patients' age are important factors for the selection of the proper method and, several protocols, such as slow, semi-rapid maxillary expansion (SRME) and rapid maxillary expansion (RME) have been suggested (2).
From this view, SRME protocol has been suggested for growing patients and young adults, thus, the development of the nasomaxillary complex could be stimulated and the incidence of relapse could be reduced (6).
The purpose of this study was to compare the skeletal, dentoalveolar and periodontal effects that occurred after RME and SRME with acrylic splint bonded expansion appliance and also to compare the degree of root resorption of the supporting teeth during expansion.
Group 1 (SRME): This group consisted of 10 patients (5 females and 5 males) treated with a SMRE protocol.
If a gap was seen between the two halves of palatal processes of the maxillary bone, the screw activation protocol was reduced to a quarter tour (1/4 turn=0.25 mm) per day every other day in SRME group.
SRME and RME groups' images are shown in Figure 9 and Figure 10.
In the SRME group (group 1), ANB, MP-PP, SN-MP angles, ANS-Me, and VR1A distances were increased significantly where Ul-SN angle and overbite were decreased statistically significantly (p<0.0083) at TITO.
In the SRME group, significant increases in nasal cavity width (NC-CN), left and right maxillary width (MW), U6R[degrees], and U6L[degrees] were found duringT0-T1.
In SRME group, the changes during the total treatment period (T2-T0) were analyzed on the axial sections of the CT images and significant decreases in the BABT of tooth number 16 (level of the distobuccal and mesiobuccal roots), and significant increases in the palatal bone thickness of the same tooth were found (p<0.0125).
The BABT of the tooth number 26 was compared between group RME and group SRME. An average decrease of 0.4 mm in group SRME and 0.2 mm in group RME were measured.
In our study, after the active expansion period, U6R[degrees] value increased to 8.9[degrees] in SRME and 9.39[degrees] in RME groups.