The efficiency of a customized distalizer with Variety SP<sup>®</sup> screws anchored on palatal miniscrews for upper molar distalization

POGHOSYAN, Davit; GRIGORYAN, Davit; TER-POGHOSYAN, Diana; GUNAVEERASEKARAN, Gokulraj; DARA, Swasa; TER-POGHOSYAN, Hrant

doi:10.1590/2177-6709.29.2.e2423253.oar

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Dental Press Journal of Orthodontics

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ORIGINAL ARTICLE • Dental Press J. Orthod. 29 (2) • 2024 • https://doi.org/10.1590/2177-6709.29.2.e2423253.oar copy

The efficiency of a customized distalizer with Variety SP^® screws anchored on palatal miniscrews for upper molar distalization

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Objective:

To assess the effectiveness of a customized distalizer with Variety SP^® screws anchored on palatal miniscrews for upper molar distalization.

Methods:

Seventeen patients aged between 12.5 and 24 years underwent distalization with a customized distalizer. Lateral cephalogram and cast analysis were performed before and after distalization. Linear and angular parameters of the upper first molar, first premolar, and central incisor were assessed.

Results:

Distalization with the force passing near the center of resistance (CR_es) of the upper first molars resulted in distal movement, with minimal distal tipping (2.8 ± 0.45°, p< 0.05). However, distalization passing occlusal to the CR_es led to greater distal tipping (13.6 ± 1.63°, p< 0.05). Statistically significant spontaneous distal tipping and distal movement of the upper first premolars occurred, with a mean of 6.2 ± 1.24° (p< 0.05) and 0.68 ± 0.34 mm (p< 0.05), respectively. The positional change of the upper central incisors presented a mean of -0.23 ± 0.1 mm (p> 0.05) and 2.65 ± 1.1° (p< 0.05). Upper first molar intrusion was statistically significant, with a mean of 0.88 ± 0.2 mm (p< 0.05).

Upper right and left first molars rotation towards palatal midline presented mean of 4.1 ± 0.19° (p< 0.05) and 3.4 ± 0.1° (p< 0.05), respectively. Additionally, the distance between upper right and left first molars increased significantly, with a mean of 2.54 ± 0.01 mm (p< 0.05).

Conclusion:

The study successfully demonstrated the efficiency of molar distalization without anchorage loss using a customized distalizer anchored on palatal miniscrews.

Keywords:
Cephalometrics; Class II; Distalization; Orthodontic miniscrew

	U6/SN		U6-dis.point/PTV		U4/SN		U4-dis.point/PTV		U1 CEJ. /PTV		U1/SN		U6 mes. cusp/FH.
	T1	T2	T1	T2	T1	T2	T1	T2	T1	T2	T1	T2	T1	T2
Patient 1	64°	63°	17.5 mm	12 mm	75°	61°	35 mm	33 mm	54.5 mm	56 mm	92°	89°	43.5 mm	43.5 mm
Patient 2	77°	74°	25 mm	22 mm	76°	75°	43 mm	44 mm	65 mm	65 mm	105°	98°	45 mm	45 mm
Patient 3	79°	74°	18.5 mm	15 mm	94°	89°	35 mm	36 mm	54 mm	54.5 mm	102°	104°	45 mm	44.5 mm
Patient 4	75°	60°	16.5 mm	12 mm	88°	79°	35 mm	34.5 mm	55.5 mm	56.5 mm	124°	125°	45 mm	42 mm
Patient 5	68°	64°	14.5 mm	12 mm	84°	87°	34 mm	34 mm	54 mm	53 mm	96°	92°	40 mm	39.5 mm
Patient 6	75°	59°	19.5 mm	17 mm	87°	85°	36 mm	35.5 mm	55.5 mm	56.5 mm	106°	102°	38.5 mm	37 mm
Patient 7	76°	72°	17 mm	15 mm	91°	88°	34 mm	33 mm	54 mm	54.5 mm	103°	105°	38 mm	38 mm
Patient 8	67°	52°	20.5 mm	16 mm	75°	72°	34 mm	33.5 mm	53 mm	53 mm	95°	91°	47 mm	44 mm
Patient 9	75°	76°	20.5 mm	14 mm	84°	83°	37 mm	37 mm	52 mm	52 mm	106°	102°	45.5 mm	46 mm
Patient 10	67°	54°	18 mm	13 mm	77°	64°	35 mm	33 mm	52 mm	53 mm	96°	97°	44.5 mm	42.5 mm
Patient 11	72°	73°	16.5 mm	13.5 mm	100°	90°	34 mm	32.5 mm	51 mm	50 mm	107°	104°	37 mm	37 mm
Patient 12	79°	76°	19.5 mm	16.5 mm	83°	78°	36 mm	35 mm	52.5 mm	53 mm	96°	98°	42.5 mm	41.5 mm
Patient 13	83°	81°	28 mm	24.5 mm	86°	83°	43 mm	42 mm	60 mm	60.5 mm	112°	115°	46 mm	45 mm
Patient 14	79°	70°	25 mm	22 mm	92°	85°	42 mm	42.5 mm	59.5 mm	60 mm	116°	112°	39.5 mm	38 mm
Patient 15	76°	73°	27 mm	23.5 mm	87°	83°	40.5 mm	39.5 mm	59 mm	58 mm	110°	106°	38 mm	37.5 mm
Patient 16	78°	73°	18.5 mm	14.8 mm	85°	70°	34 mm	33 mm	52.5 mm	52.5 mm	105°	101°	41 mm	41.5 mm
Patient 17	81°	75°	22.5 mm	17 mm	96°	82°	40 mm	38 mm	58 mm	58 mm	112°	106°	43.5 mm	42.5 mm

Cephalometric and cast analysis	n	T1 mean	T1 SD	T2 mean	T2 SD	T1-T2 mean	T1-T2 SD	p-value
U6/SN (degrees)	17	74.7	5.4	68.7	8.4	6.0	3.0	0.0004
U6-dis.point./PTV (mm)	17	20.2	3.9	16.4	4.1	3.8	0.2	< 0.0001
U4/SN (degrees)	17	85.9	7.36	79.6	8.6	6.2	1.24	0.0002
U4-dis.point./PTV (mm)	17	36.9	3.36	36.2	3.7	0.68	0.34	0.0098
U1 CEJ. /PTV (mm)	17	55.41	3.8	55.64	3.9	-0.23	0.1	0.14
U1/SN (degrees)	17	104.8	8.4	102.2	9.5	2.65	1.1	0.028
U6 mes. cusp/FH (mm)	17	42.3	3.2	41.4	3.0	0.88	0.2	0.006
UR6 m1-UL6 m1 (mm)	12	50.87	3.56	53.4	3.57	2.54	0.01	< 0.0001
UR6 m1p1/midline (degrees)	12	55.7	10.14	51.6	9.95	4.1	0.19	0.017
UL6 m1p1/midline (degrees)	12	55.5	7.4	52.1	7.5	3.4	0.1	0.021

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The efficiency of a customized distalizer with Variety SP® screws anchored on palatal miniscrews for upper molar distalization

ABSTRACT

Objective:

Methods:

Results:

Conclusion:

The efficiency of a customized distalizer with Variety SP^® screws anchored on palatal miniscrews for upper molar distalization