软组织垂直厚度对牙周炎患者种植修复临床效果的影响

doi:10.19723/j.issn.1671-167X.2020.02.022

Abstract

Abstract:

Objective: To observe and investigate the effect of vertical soft tissue thickness on the peri-implant tissue condition and the prevalence of peri-implant disease in patients with history of periodontitis. Methods: Among 210 patients who showed initial interest of implant therapy, 92 patients were included in this study and received implant surgery during 2010 and 2015. Sixty-six patients with 66 implants finally came back for T2 evaluation. Prior to the implant therapy, all the patients had received periodontal treatment. During the implant placement surgery, the distance from palatal soft tissue edge to the alveolar crest, which was defined as vertical soft tissue thickness (VT), was measured after the buccal full thickness flap was elevated. According to the cut off point which was adopted from the operating characteristic curve, 66 implants within 66 patients were divided into two groups, which were called normal group (VT≤4.5 mm) and thick group (VT>4.5 mm), respectively. Information of the patient's general status, periodontal situation and implant information were recorded. After a follow-up period of 42.9 months, the parameters of peri-implant tissue and condition of peri-implant disease were recorded. Mann-Whitney U test as well as Chi-square test were used to compare the parameters between two groups. Moreover, Kaplan-Meier method was chosen to draw the event(peri-implantitis)-free survival curve. Results: The survival rate of the implants was 100%. At the end of the follow-up examination(T2), the parameters including max PDi, mean PDi, max BIi, mean BIi, mean MBL, MBL at distal side, MBL at mesial side, mean PLIi presented significantly higher values in thick group than in normal group (P ＜ 0.05). Moreover, the prevalence of peri-implantitis and peri-implant disease(peri-implant mucositis & peri-implantitis) in thick group was respectively 34.8% and 73.9%, which was significantly higher than 2.3% and 48.8% respectively in normal group (P＜0.05). The prevalence of peri-implant mucositis did not show significant difference in the two groups. In addition, Kaplan-Meier analysis showed that there was significant difference between the event-free survivals of the two groups. Conclusion: The vertical soft tissue thickness around implants in patients with periodontitis has a significant effect on the health of the peri-implant tissue. Excessive vertical soft tissue thickness may result in deeper peri-implant probing depth as well as more peri-implant marginal bone loss, and eventually increase the risk of peri-implant disease. The vertical remodeling of soft tissue may be a new direction to indicate the role of periodontitis in peri-implant tissue condition. Moreover, the biological mechanism of the association between soft tissue thickness and peri-implantitis risk as well as effective approaches to prevent the adverse effect of excessive soft tissue thickness on peri-implant tissue is necessary to be investigated.

Key words: Dental implants, Vertical soft tissue thickness, Peri-implant marginal bone loss, Peri-implant disease, Peri-implantitis

CLC Number:

R783.3

Zhong ZHANG,Huan-xin MENG,Jie HAN,Li ZHANG,Dong SHI. Effect of vertical soft tissue thickness on clinical manifestation of peri-implant tissue in patients with periodontitis[J].Journal of Peking University (Health Sciences), 2020, 52(2): 332-338.

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References 23

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Soft tissue thickness	Number of patients	Mean age/ years	Gender, male/female	Periodontitis, chronic/aggressive	Periodontitis, grade Ⅰ-Ⅱ/Ⅲ-Ⅳ	Smoking, yes/no	Follow-up period/months	Maintenance frequency,M1/M0
Normal	43	51.4±10.1	16/27	39/4	5/38	7/36	37(26-55)	29/14
Thick	23	51.0±11.9	11/12	18/5	1/22	4/19	45(32-53)	11/12

Soft tissue thickness	Number of implants	Anterior region	Posterior region	Maxilla	Mandible	Type of implants			Bone grafting, yes/no
Soft tissue thickness	Number of implants	Anterior region	Posterior region	Maxilla	Mandible	Subcrestal implants	Bone level	Tissue level	Bone grafting, yes/no
Normal	43	9(20.9%)	34(70.1%)	16(37.2%)	27(62.8)	12(27.9%)	10(23.3%)	21(48.8%)	25/18
Thick	23	10(43.5%)	13(56.5%)	16(69.6%)^*	7(30.4%)^*	13(56.5%)^*	6(26.1%)	4(17.4%)^*	14/9

Soft tissue thickness	Max PDi/ mm	Mean PDi/ mm	Max BIi	Mean BIi	Mean MBL/mm			Mean PLIi
Soft tissue thickness	Max PDi/ mm	Mean PDi/ mm	Max BIi	Mean BIi	Mesial side	Distal side	Mean	Mean PLIi
Normal	4(3-5)	3(2.3-3.5)	2(1-3)	2(1-2.5)	0.39(0.00-0.67)	0.40(0.03-0.67)	0.38(0.16-0.64)	2(1-2)
Thick	5(4-7)^*	4.8(3-5)^*	3(2-4)^*	2.5(2-4)^*	0.74(0.52-1.07)^*	0.81(0.45-1.06)^*	0.69(0.44-1.07)^*	2(2-3)^*

Soft tissue thickness	Number of implants	Peri-implant mucositis	Peri-implantitis	Peri-implant disease (Peri-implant mucositis & Peri-implantitis)
Normal	43	30(69.8%)	1(2.3%)	31(72.1%)
Thick	23	13(56.5%)	8(34.8%)^*	21(91.3%)

Soft tissue thickness	Number of implants	Position of implants	Type of implants	Bone grafting, yes/no
Normal	1	26	Subcrestal implant	Yes
Thick	1	43	Subcrestal implant	No
	2	46	Tissue level	Yes
	3	16	Tissue level	Yes
	4	25	Subcrestal implant	Yes
	5	12	Bone level	Yes
	6	11	Subcrestal implant	Yes
	7	11	Subcrestal implant	Yes
	8	15	Bone level	Yes

Effect of vertical soft tissue thickness on clinical manifestation of peri-implant tissue in patients with periodontitis

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