The effect of removable partial dentures on periodontal health of abutment and non-abutment teeth

BACKGROUND: A removable partial denture (RPD) is a common treatment available for restoration of partially edentulous ridges. Longitudinal studies indicate that RPDs have been associated with increased gingivitis, periodontitis, and abutment mobility. METHODS: A total of 205 patients with RPDs participated in this study. There were 80 males and 125 females aged 38 to 89, with 123 maxillary and 138 mandibular RPDs. Patients were wearing existing RPDs for different periods ranging from 1 to 10 years. A two-part questionnaire was devised for this study. In the first part, patients answered questions on gender; age; smoking habits; denture age; denture wearing habits; mouth odor; and problems with food accumulating under the denture base, on the outside surface of the denture, and on the outside surface of remaining teeth after eating. The Kennedy classification, material, denture support, denture base shape, and number of teeth in contact, number of existing clasps, and occlusal rests were categorized. The quality of denture construction was also evaluated. In the second part of the questionnaire, baseline recordings of plaque (PI), gingival (GI), and calculus (CI) indexes were made, and Tarbet index (TI), as well as probing depth (PD), gingival recession (GR), and tooth mobility (TM) were measured, both on abutment and non-abutment teeth. RESULTS: Significant differences (P <0.01) were noted for PI, Cl, GI, PD, TM, and GR between abutment and non-abutment teeth, with abutment teeth showing more disease. CONCLUSIONS: RPD design plays an important role in the state of the periodontium. Appropriate design and good oral hygiene may decrease the appearance of periodontal disease.     

Microbiological and clinical assessment of the abutment and non-abutment teeth of partial removable denture wearers

ObjectiveThe aim of this study was assessing the changes in both clinical and microbiological parameters of healthy individuals after rehabilitation with removable partial denture (RPD).Design11 women received unilateral or bilateral free-end saddle RPD in the mandibular arch. Clinical and microbiological parameters of abutment, non-abutment, and antagonist teeth were assessed at baseline (RPD installation) and after 7, 30, 90, and 180 days of function. The Checkerboard DNA–DNA hybridization technique was used to identify and quantify up to 43 different microbial species from subgingival biofilm samples. Probing depth, gingival recession, and bleeding on probing were also investigated over time.ResultsThe total and individual microbial genome counts were shown significantly increased after 180 days with no significant differences between abutment, non-abutment, or antagonist teeth. Streptococcus spp., Aggregatibacter actinomycetemcomitans, and other species associated to periodontitis (Peptostreptococcus anaerobius, Prevotella nigrescens, and Tannerella forsythia), as well as opportunistic Candida spp., were recovered in moderate counts. Abutment teeth presented higher values of gingival recession when compared with non-abutment or antagonist teeth, irrespectively time of sampling (p < 0.05). No significant differences were found between groups regarding bleeding on probing or probing depth over time.ConclusionsOverall, the microbial counts significantly increased after 6 months of denture loading for both abutment and non-abutment teeth with no significant differences regarding the microbial profile over time. Bleeding on probing and probing depth showed no significant difference between groups over time whereas gingival recession increased in the abutment teeth.     

Follow-up study of periodontal tissues around the abutment teeth in Konus telescope denture

The purpose of this study was to evaluate the periodontal tissues around the 47 abutment teeth in patients with advanced periodontitis for 5 years maintenance periods. The periodontal and prosthetic treatment were carried out and 16 Konus telescope dentures were applied for 11 patients. During 5 years maintenance therapy, periodontal conditions were observed once a year assessing probing depth, attachment level, tooth mobility index, gingival index, marginal alveolar bone height, width of periodontal ligament and loss of lamina dura. The results showed that increase of probing depth in 0.61 mm and attachment loss in 0.78 mm were observed for 5 years. A slight gingival inflammation occurred and tooth mobility increased in some extent. Enlargement of periodontal ligament space and loss of lamina dura in 40% of abutment teeth were observed for 5 years. There were six decayed teeth, six teeth, from which a intracoronal crown was removed, and two extracted teeth in 47 abutment teeth. In conclusion, the periodontal tissues around abutment teeth in Konus telescope denture changed slightly at one year after denture placement, after which, the periodontal tissues were well maintained.     

圆锥型套筒冠义齿修复牙周病伴牙列缺损的龈下菌丛分析

目的:探讨圆锥型套筒冠义齿修复牙周病伴牙列缺损的龈下菌群的分布情况。方法:纳入符合标准的受试者18例,受试位点36个,检查记录各牙周袋深度(PD)、牙龈指数(GI)。采集龈下菌斑标本,经厌氧培养基培养、鉴定,分别进行义齿修复前、后的基牙组与非基牙组龈下菌丛的比较。应用SPSS10.0软件进行χ2检验。结果:圆锥型套筒冠义齿修复3a后,基牙组的GI和PD均趋于正常,非基牙组的GI和PD较基牙组高;基牙组与非基牙组龈下菌斑内各类厌氧菌的阳性检出率高于修复前,基牙组中,牙龈卟啉单胞菌、二氧化碳噬纤维菌差异无统计学意义(P>0.05),其余各菌差异均有统计学意义(P<0.05);非基牙组内各菌差异均有统计学意义(P<0.05)。结论:圆锥型套筒冠义齿能有效控制牙周致病菌的聚集与附着,防止牙周病复发,可作为修复重度牙周病伴牙列缺损的优选修复体。     

Multifactorial risk assessment for survival of abutments of removable partial dentures based on practice-based longitudinal study

Objectives

Predicting the tooth survival is such a great challenge for evidence-based dentistry. To prevent further tooth loss of partially edentulous patients, estimation of individualized risk and benefit for each residual tooth is important to the clinical decision-making. While there are several reports indicating a risk of losing the abutment teeth of RPDs, there are no existing reports exploring the cause of abutment loss by multifactorial analysis. The aim of this practice-based longitudinal study was to determine the prognostic factors affecting the survival period of RPD abutments using a multifactorial risk assessment.

Methods

One hundred and forty-seven patients had been previously provided with a total of 236 new RPDs at the Osaka University Dental Hospital; the 856 abutments for these RPDs were analyzed. Survival of abutment teeth was estimated using the Kaplan–Meier method. Multivariate analysis was conducted by Cox's proportional hazard modelling.

Results

The 5-year survival rates were 86.6% for direct abutments and 93.1% for indirect abutments, compared with 95.8% survival in non-abutment teeth. The multivariate analysis showed that abutment survival was significantly associated with crown-root ratio (hazard ratio (HR): 3.13), root canal treatment (HR: 2.93), pocket depth (HR: 2.51), type of abutments (HR: 2.19) and occlusal support (HR: 1.90).

Conclusion

From this practice-based longitudinal study, we concluded that RPD abutment teeth are more likely to be lost than other residual teeth. From the multifactorial risk factor assessment, several prognostic factors, such as occlusal support, crown-root ratio, root canal treatment, and pocket depth were suggested.

Clinical significance

These results could be used to estimate the individualized risk for the residual teeth, to predict the prognosis of RPD abutments and to facilitate an evidence-based clinical decision making.     

游离端义齿修复中太极扣附着体对基牙牙周的影响

目的研究单侧后牙游离缺失修复中太极扣附着体对基牙牙周健康的影响。方法选择肯氏Ⅱ类缺损患者20例,采用太极扣附着体修复。纵向观察修复前、修复后2周、修复后6个月第一、二、三基牙的牙周指数及牙槽骨吸收情况,并进行统计学分析。结果太极扣附着体修复后牙游离缺失后2周和修复后6个月内,义齿稳定,固位良好。第一、二、三基牙牙龈指数、菌斑指数、探诊深度在治疗前、修复后2周之间的差异,以及治疗前、修复后6个月之间的差异均无统计学意义;基牙X线根尖片未见根尖病变,未见明显牙周膜增宽、牙槽骨吸收或高度降低;修复前基牙的松动度在进行联冠修复后有所降低。结论太极扣附着体应用于游离端义齿修复对基牙牙周健康未见不利影响。     

An evaluation of the effects of two distal extension removable partial denture designs on tooth stabilization and periodontal health

A 30-month follow-up study was conducted on 36 patients to evaluate the effects of the lingual plate as a major connector in distally extended removable partial dentures (RPDs) on tooth stabilization. At the same time, the study evaluated the effects of lingual plate-type RPDs and lingual bar-type RPDs on periodontal health. The most striking finding of the study was that, with the exception of gingival recession (GR), periodontal conditions improved with both types of RPDs. At the end of 30 months, there were significant differences in plaque index, GR and tooth mobility (TM) values between treatment groups (P < 0.05). Plaque accumulation was greater in the lingual plate treatment group; however, this did not result in periodontal breakdown. There were no statistically significant differences between treatment groups with respect to pocket depth, gingival index or attachment loss (P > 0.05). Moreover, patients treated with lingual plate-type RPDs demonstrated less TM when compared with patients treated with lingual bar-type RPDs at the end of 30 months follow-up. Overall study findings established that with adequate checks on oral and denture hygiene at regular intervals, patients with RPDs may even experience improved periodontal health. Moreover, the clinical interpretation of decreased TM observed in patients treated with lingual plate-type RPDs may be questionable as the plaque accumulation was greater in the lingual plate treatment group inspite of periodic recalls.     

Periodontal and microbiological parameters in children and adolescents with cleft lip and /or palate

Objective.  To evaluate the oral hygiene and the periodontal condition of children and adolescents with cleft lip and/or palate (CLP).
Methods.  Forty-one children and adolescents, 4–18 years, with CLP and 41 normal controls participated. Clinical parameters examined were the plaque and gingival index and Community Periodontal Index of Treatment Needs. For teeth in the cleft area, probing pocket depth, bleeding on probing, and tooth mobility were also evaluated. Samples of subgingival plaque were collected from 21 randomly selected patients of each group.
Results.  The CLP group had generally poorer oral hygiene (plaque index significantly higher) compared with the control. Children in both groups presented mild degree of gingivitis. Teeth in the cleft area had significantly higher pocket probing depth and tooth mobility, compared with corresponding teeth in the control group. The microbial analysis did not reveal significant differences in the composition of the subgingival microbiota between groups. Teeth in the cleft presented higher isolation frequencies and mean percentages of periodontopathic bacteria.
Conclusion.  Youngsters with CLP showed poor oral hygiene and worse periodontal condition, compared with controls. The above results advocate their participation in an intensive preventive dental programme that should start at an early age, possibly decreasing the risk of future periodontal disease.     

Bio-Oss联合Bio-Gide治疗牙周炎垂直型骨吸收的临床疗效观察

目的评价异种骨移植物Bio-Oss联合Bio-Gide治疗牙周骨下袋的临床疗效。方法选择28例全身健康的慢性牙周炎患者,经基础治疗6周以上,牙周袋深度超过5mm的垂直型骨吸收患牙40牙位,随机平分为2组。引导组织再生GTR组20个牙位,在翻瓣术同时植入Bio-Oss和Bio-Gide。对照组20个牙位仅行翻瓣术;术后3、6、12个月回访,检查探诊出血指数、菌斑指数、牙周探诊深度、临床附着丧失、牙龈退缩和牙松动度,及X线检查比较2组骨缺损修复情况。结果 GTR组术后3、6、12个月牙周探诊深度、临床附着丧失、探诊出血指数均比术前及对照组明显改善（P〈0.01）;术后6、12个月牙松动度比术前及对照组明显减轻;术后3、6、12月菌斑指数比术前轻度降低（P〈0.05）。对照组术后3、6、12个月牙周探诊深度和探诊出血指数较术前减少,临床附着丧失和菌斑指数较术前轻度降低,牙松动度和龈退缩与术前差异无显著性。结论 Bio-Oss联合Bio-Gide能明显减轻牙周袋深度和减少牙周附着丧失,可促进牙周形成新附着和新骨。     

A clinical study of the periodontal status of abutment teeth supporting swinglock removable partial dentures—A pilot study

Eleven patients wearing mandibular swinglock bilateral distal extension removable partial dentures opposing maxillary complete dentures were studied for a period up to 2 years. They had moderate to advanced periodontal disease with retrograde mobility patterns. Periodontal therapy, as well as treatment of dental carious lesions, was completed before fabrication of the prosthesis. Recordings of the gingival status, pocket depth, plaque score, tooth mobility, and dental caries were made at the time of the placement of the prosthesis and thereafter at 6-month intervals. Final results were obtained at the end of 2 years in six patients (group A) and at 1/12 years in five patients (group B).Our findings show that both groups had a statistically significant increase in gingival inflammation. However, no differences in degree of inflammation were observed between the two groups with regard to the status of gingival tissues that were covered and uncovered by the components of the swinglock removable partial denture. Also, no statistically significant differences in pocket depths and plaque scores were found between the time of placement of the swinglock removable partial denture and the final recall visit. Of the 61 abutment teeth, 85.2% had no significant change in mobility, 11.5% showed a substantial decrease in mobility, and 3.3% showed a considerable increase in mobility.The patients were able to successfully wear the swinglock removable partial denture without clinically significant changes in the supporting structures of the abutment teeth.This report is part of an ongoing study to determine the efficacy of swinglock removable partial dentures.     

Blood flow and human periodontal status

The purpose of this study was to evaluate the microcirculation in subjects with moderate gingivitis, periodontitis, and healthy gingiva. Sixty adult volunteers with clinically healthy gingiva, moderate gingivitis, and periodontitis (20 subjects each) participated in this study. The ages of the research samples ranged from 20 to 35 years. Gingival health was evaluated by using the qualitative plaque index, gingival index, gingival bleeding index, tooth mobility, probing pocket depth, clinical attachment level, and laser Doppler flowmetry (LDF) on six maxillary anterior teeth. LDF data were recorded at the facial aspect of free gingivae, interdental gingivae, attached gingivae, and alveolar mucosae on six maxillary anterior teeth, utilizing an acrylic stent to stabilize the probe. This technique was then modified to circumvent contamination by saliva and gingival exudate. When results were compared at similar sites in each patient within a trial group, there were significant differences in blood flow measurements at all the sites examined between moderate gingivitis and periodontitis when compared with measurements in healthy human gingiva. However, blood flow measurements within the same group showed significant differences at every site, at P < 0.01. Received: December 17, 2001 / Accepted: January 23, 2002     

Depressive symptoms in relation to periodontal health in a Jordanian sample

Abstract:  Objectives : This cross-sectional study examines the relationship of depression symptoms to periodontal diseases and decayed (D), missing (M) and filled teeth (FT) in a sample of the Jordanian population. Methods : Subjects escorting dental patients attending two dental hospitals in North Jordan were included. Each subject received full periodontal examination, including probing pocket depth (PPD), clinical attachment level (CAL), gingival index (GI) and plaque index (PI). The numbers of M, D and F teeth were also recorded. The Zung Self-rating Depression Scale was used to determine susceptibility to depression. Results : The frequency of high susceptibility to depression among periodontitis-free subjects and those with periodontitis was found to be 48% and 50% respectively. There was no statistically significant association between susceptibility to depression symptoms and periodontal parameters, including PPD, CAL, PI and GI ( P  >   0.05 ) . However, subjects with low susceptibility to depression had significantly more FT than subjects highly susceptible to depression. Conclusions : High susceptibility to depression does not play a significant role in the aetiology and severity of periodontitis in the population studied.     

覆盖义齿修复方式保留重度牙周病口内余留牙的远期效果

目的观察重度牙周病口腔内余留牙体部分切除后,以覆盖义齿方式保留的远期效果。方法 追踪检查2001～2006年内采用不同覆盖义齿方式保留下来的基牙141颗,临床检查覆盖义齿的基本使用状况,测定口腔内剩余牙炎症程度、牙松动度和咀嚼效能,进行对比分析。结果基牙牙龈炎症消退,牙周炎得到一定控制,松动度普遍有一定缓解,义齿咀嚼功能良好,其中疗效Ⅰ级109颗,Ⅱ级20颗,Ⅲ级12颗。结论选用适当的覆盖义齿方式保留重度牙周病的牙体远期疗效是肯定的。     

Influence of bonded composite resin cingulum rest seats on abutment tooth periodontal tissues: a longitudinal prospective study

This study aimed to examine the longitudinal influence of bonded composite resin cingulum rest seats on abutment tooth periodontal tissues in removable partial dentures (RPDs). Twenty-eight patients with RPDs were enrolled in the study. Thirty-one cingulum rest seats were prepared for an anterior tooth using composite resin and a standardized method for each patient. Periodontal indices such as probing pocket depth (PD), bleeding on probing (BoP), and tooth mobility (TM) were measured at the time of denture insertion (baseline) and at least 3 months postinsertion (up to 8 years). Control data were obtained from the remaining nonprepared anterior teeth on the other side of the arch. None of the bonded resin rest seats failed, but slight abrasion was observed in 3 rest seats. No significant differences were found in terms of PD, BoP, and TM between baseline and postinsertion data for abutments with bonded resin rest seats and controls. It is suggested that bonded composite resin cingulum rest seats can be used longitudinally without damaging the periodontal tissues of abutment teeth.     

Experimental gingivitis in periodontitis-susceptible subjects

Abstract The purpose of this study was to evaluate clinical, microbiological, and gingival crevicular fluid (GCF) profiles in periodontitis-resistant and periodontitis-susceptible subjects during 4 weeks of experimental gingivitis. Experimental groups of similar ages were defined as gingivitis controls (GC; n=10) and history of rapidly progressive periodontitis (RPP; n=10). respectively. Prior to baseline, all subjects achieved good plaque control (plaque index (P1I) ～0) and gingival health (gingival index (GI)=0). and had probing depths ≤4 mm on experimental teeth. For 4 weeks after baseline, oral hygiene around maxillary 2nd premolar and 1st molar teeth was inhibited by a plaque guard. The plaque guard was removed weekly for GCF sampling to determine interleukin (IL)-1β and prostaglandin (PG)E₂ amounts by ELISAs. In addition. PII. GI. probing depth, and gingival recession measurements were made. Subgingival plaque darkfield microscopy and DNA probe analysis also were performed. Results indicated that clinical signs of inflammation, microbiological patterns and GCF profiles progressed similarly in both groups. However, plaque accumulated more rapidly in the susceptible subjects. PII in RPP at 4 weeks was 2.1±0.1 compared to 1.5±0.2 in GC, with an incidence of PII>1 of 100% versus 50%, respectively (logistic regression; p<0.000l). Hence, the clinical, microbiological and host factors selected for this study were unrelated to previous susceptibility to periodontitis when evaluated in the experimental gingivitis model. However, the increased rate of plaque accumulation, following thorough plaque removal, in RPP patients suggests a potential factor in disease recurrence in these susceptible subjects.     

Does temporary splinting before non-surgical therapy eliminate scaling and root planing-induced trauma to the mobile teeth?

The objective of this study was to determine whether temporary splinting of periodontitis-affected mobile teeth, prior to non-surgical mechanical therapy, affects treatment outcome by eliminating scaling and root planing-induced trauma to the teeth. Mandibular anterior teeth of 29 patients (15 females; 14 males; age range 30 to 48 years) with adult periodontitis were evaluated. Clinical measurements were performed at 4 sites per tooth including mesial, distal, buccal and lingual aspects at baseline, 3 and 6 months after treatment. The following clinical parameters were analyzed: plaque index (PI), gingival index (GI), bleeding on probing (BOP), pocket depth (PD), probing attachment level (PAL), gingival margin level (GML) and tooth mobility (TM). Patients were randomly divided into 3 groups: i) group 1 (n = 8) received scaling and root planing (SRP) only, ii) group 2 (n = 10) received scaling and root planing before splinting and iii) group 3 (n = 11) received scaling and root planing after splinting. Statistical analysis revealed that there were no significant differences among the groups for either bleeding on probing or probing attachment level values at any of the time intervals. At the end of the study, the greatest decrease in pocket depth was noted in group 2 (1.24+/-0.10 mm) which was thought to be the result of gingival recession (0.73+/-0.07 mm). Group 1 was the only group that showed reduction in tooth mobility at 3 months compared to baseline (1.67+/-0.55 PTV units). Group 3 displayed the least reduction in tooth mobility during the entire study period (0.26+/-0.44 PTV units). In conclusion, splinting of mobile teeth before SRP, and thereby elimination of potential SRP-induced trauma to the mobile teeth, did not show any adjunctive effect on healing when compared to splinting after SRP. Thorough debridement of root surfaces, even performed in the presence of increased mobility, resulted in improvements in clinical parameters, i.e. mechanical manipulation of mobile teeth during periodontal treatment did not affect clinical outcome negatively.     

Periodontal response to cantilevered and fixed-fixed resin bonded bridges

The periodontal response to two types of resin bonded bridges was investigated. Cantilever or fixed-fixed resin bonded bridges which had been in service for at least two years were reviewed. Periodontal indices (plaque index, gingival index, bleeding index and pocket depth) were recorded for each bridge abutment and for matched contralateral teeth. There was no difference in the periodontal condition of the abutment teeth between cantilever and fixed-fixed resin bonded bridges, after they had been in service for at least two years. There was evidence of greater plaque accumulation and higher gingivitis levels affecting abutment teeth for both types of bridges compared with control teeth.     

Adjunctive controlled topical application of tetracycline HCl in the treatment of localized persistent or recurrent periodontitis

Abstract 35 patients receiving regular supportive periodontal therapy (SPT) and showing signs of localized persistent or recurrent periodontitis were enrolled in the study. Within 1 week after SPT, each patient had a tetracycline HCl loaded ethylene vinyl acetate co-polymer fiber placed into the periodontal pocket of 1 randomly selected tooth with persistent or recurrent periodontitis (test); the fiber was removed after 9.5±2.0 days. A non-adjacent tooth with persistent or recurrent periodontitis in a separate quadrant, which received no further treatment, served as a control. A total of 28 patients completed the 6-month study. Compared to control teeth, in test teeth at 6 months significantly (p < 0.01) lower scores were found for gingival index, pocket probing depths, and PMN elastase-α₁-proteinase inhibitor concentrations in gingival crevicular fluid. With the exception of plaque index scores, test teeth demonstrated significant reductions from baseline to 6 months in all parameters (p < 0.05). Conversely, all parameter measurements in control teeth, except bleeding on probing, showed no significant difference between baseline and 6-month values. The results suggest that the use of controlled topical application of tetracycline HCl may improve periodontal health and reduce the risk of disease progression in localized persistent or recurrent periodontitis. Moreover, the effects of this application appear to be sustained for at least 6 months.     

Marginal fit of 14-unit zirconia fixed dental prosthesis retainers

Summary  The marginal fit of 14-unit fixed dental prosthesis retainers and single-crown copings fabricated by the same computer-aided design (CAD)/computer-aided manufacturing (CAM) system were evaluated in vitro hypothesizing that the marginal opening might be independent of the type of restoration. Eight ivorine maxillary teeth (FDI locations 27, 25, 23, 21, 11, 13, 15 and 17) were prepared to accommodate a 14-unit prosthesis. Ten fixed dental prosthesis retainers and 40 single-crown-copings were fabricated using Zeno CAD/CAM on 20 master dies. Four cross-sections were made from each tooth and the marginal gap dimensions were measured. One-way anova was used to test the difference between the experimental groups and two-way anova and a post hoc test (Student–Newman–Keuls) were carried out to determine the influence of the location of the abutment tooth and the measurement location within the abutment tooth in the experimental groups ( P  < 0·05). Mean marginal gap dimensions and standard deviations for fixed dental prosthesis retainers and single-crown copings were 25 ± 29 and 13 ± 12 μm, respectively. The type of restoration showed a significant influence ( P  < 0·001) on the marginal gap. The location of the abutment tooth ( P  < 0·001) and the measurement location ( P  < 0·001) exhibited significant influence on marginal gaps of fixed dental prosthesis retainers while no influence on single-crown copings could be detected. The highest marginal gaps were found at the palatal surface of the incisor and canine of the 14-unit fixed dental prosthesis retainers. Fourteen-unit fixed dental prosthesis showed significantly higher marginal openings than single crowns fabricated under the same conditions. However, both restorations showed clinically acceptable marginal openings.     

纳米非晶金刚石膜镀覆镍铬合金烤瓷冠对基牙牙周组织的影响

目的:观察纳米非晶金刚石膜镀覆镍铬合金烤瓷冠对基牙牙周组织的影响。方法:应用镍铬合金烤瓷冠(未镀膜组)修复49例65颗牙,纳米非晶金刚石膜镀覆镍铬合金烤瓷冠(镀膜组)修复46例62颗牙,观察对比1年后两组烤瓷冠的基牙牙周组织变化。结果:镍铬合金烤瓷冠修复1年后,未镀膜组11颗基牙牙龈发生龈染色,镀膜组3颗基牙牙龈发生龈染色;未镀膜组牙龈指数(1.64±0.22)与修复前(0.79±0.16)比较差异有统计学意义,而镀膜组牙龈指数(0.83±0.21)与修复前(0.80±0.19)比较差异无统计学意义;未镀膜组和镀膜组的修复前、修复后菌斑指数、牙周探诊深度差异无统计学意义。结论:镍铬合金烤瓷冠修复对基牙牙周组织有一定的不良影响,纳米非晶金刚石膜镀覆镍铬合金烤瓷冠对基牙牙周组织的影响较小,镀覆纳米非晶金刚石膜能减轻镍铬合金烤瓷冠基牙的牙龈染色及牙龈指数。