Post graduate student department of prosthodontics



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RAJIV GANDHI UNIVERSITY OF HEALTH SCIENCES,

KARNATAKA, BANGALORE.

ANNEXURE II

PROFORMA FOR REGISTRATION OF SUBJECT FOR DISSERTATION

1.

Name of the candidate and address (In block letters)

Dr.RESHMA.B

POST GRADUATE STUDENT

DEPARTMENT OF PROSTHODONTICS

VOKKALIGARA SANGHA DENTAL COLLEGE & HOSPITAL,

K.R.ROAD ,V.V PURAM



BANGALORE-560004


2.


Name of the institution

VOKKALIGARA SANGHA DENTAL COLLEGE & HOSPITAL,

BANGALORE-560004


3.

Course of the study and subject

MASTER OF DENTAL SURGERY (M.D.S.)

DEPARTMENT OF PROSTHODONTICS




4.


Date of admission to course

31.05.2012

5.

Title of the topic:

Assessment of correlation between schneiderian membrane thickness, gingival phenotype and residual ridge height in partially edentulous subjects: A clinical study.




6. BRIEF RESUME OF THE INTENDED WORK

6.1 NEED FOR THE STUDY

  • Knowledge of the mean thickness and the anatomic characteristics of the schneiderian membrane to the gingival phenotype and residual ridge height are very limited.




  • There are no guidelines to assess and classify schneiderian membrane’s mucosal findings in the maxillary sinus.




  • Hence the purpose of this study is to analyse the thickness, anatomic characteristics of the schneiderian membrane and its correlation to the gingival phenotype and residual ridge height using limited field view CBCT in patients referred for dental implant placement in the posterior maxilla.


6.2 REVIEW OF LITERATURE:
-Ardekian, et al. reported small residual ridge height as a risk factor for sinus membrane perforation.1
-Aimette, et al. reported that healthy sinus membranes are thicker in subjects with a thick gingival biotype than in those with a thin gingival biotype.2

-Pommer, et al. investigated the mechanical properties of the sinus membrane in vitro and showed that thicker membranes have significantly higher load limits.5

-Fu, et al. reported a positive correlation between thickness of the gingival phenotype and its underlying bone.11

-Fu, et al. reported that cone beam computed tomography measurements of both bone and labial soft tissue thickness are accurate.11



6.3 OBJECTIVES OF THE STUDY:

  • To assess the gingival phenotype and the residual alveolar ridge height to the schneiderian membrane thickness in dentulous and edentulous region.



  • To compare the gingival phenotype and the residual alveolar ridge height to the schneiderian membrane thickness in dentulous and edentulous region.



  • To correlate the gingival phenotype and the residual alveolar ridge height to the schneiderian membrane thickness in dentulous and edentulous region.

7 MATERIALS AND METHOD:

7.1 SOURCE OF DATA:

80 CBCT images of subjects referred for dental implant placement in posterior maxilla.

7.2 METHODS OF COLLECTION OF DATA:

Patient will be selected on the basis of inclusion & exclusion criteria.



7.2.1 Sample size: 80

7.2.2 Study Design: Comparative study

7.2.3 Inclusion criteria:

-Presence of clinically healthy gingiva and all the maxillary incisors.

-Absence of bleeding on probing.

-Presence of all the teeth except 16 or 26.

-No periodontal probing depth more than 3mm.

7.2.4 Exclusion criteria:

-Maxillary sinus pathologies/History of sinus surgery.

-Subjects less than 18 years of age.

-Subjects with missing upper first molars on both sides.

-Smoking or use of medications affecting gingival thickness.

-History of periodontal surgery.

-Pregnancy and lactation.

7.2.5 MATERIALS:

1. Limited Field Of View CBCT Unit (Kodak 9000 3d) With Following Specifications:

A) Input Voltage 230-240 Volts-50/60hz

B) Tube Voltage 60-90 Kilovolts (Kv)

C) Tube Current 2-15 Ma (Maximum)

D) Frequency 140 Khz (Maximum)

E) Total Filtration > 2.5 Mm Equivalent Aluminium

F) Volume Size: 50mm X 37mm

G) Stitched Volume: 9cm X 7cm X 3.75 Cm

H) Resolution: 76 Microns

I) Exposure Time: 16 Seconds

J) Lead Apron and Thyroid Collar

2. Graduated scale

3. Endodontic file no 20



      1. STUDY METHOD:

The study will include 80 consecutive patients without clinical or radiologic signs of maxillary sinus pathologies. A total of 80 CBCT images will be taken using limited field view reformatted coronal and sagittal images with 1mm slice thickness will be analysed with regard to the thickness and characteristics of the schneiderian membrane.Residual ridge height (RRH) will be determined by drawing a reference line on the CBCT image from the lowest point of the sinus floor to the highest point of the alveolar ridge.Membrane thickness(SM) will be measured at the centre of the interteeth distance (proposed implant site) for each sinus, the highest values of sinus membrane will be recorded.The soft tissue thickness will be measured at 2mm apically from the alveolar bone crest and perpendicular to the external cortical plate of the tooth socket by using an endodontic file no 20 and graduated scale at the midline of the selected teeth.Gingival phenotype will be designated as either thin (<1.5mm) or thick (>2mm) the measurement for residual ridge height, sinus membrane and gingival phenotype will be repeated on the dentulous side. Then the measurements of the dentulous area will be compared with the edentulous area in gender (male and female), age groups separately. Data will be subjected to statistical analysis using student ‘t’test.
7.3 Does the study require any investigation or intervention to be conducted on patients or other humans or animals? If so, please describe briefly.

Yes.Patients will be subjected to limited field view CBCT and the thickness of gingiva will be assessed clinically using endodontic file no 20.



    1. Has ethical clearance been obtained from your institution in case of above?

Yes,ethical clearance has been obtained.

8. LIST OF REFERENCES

1. Ardekian L, Oved-Peleg E, Mactei EE, Peled M. The clinical significance of sinus membrane perforation during augmentation of the maxillary sinus. J Oral Maxillofac Surg. 2006 Feb;64(2):277-82.

2.Aimetti M, Massei G, Morra M, Cardesi E, Romano F. Correlation between gingival phenotype and Schneiderian membrane thickness. Int J Oral Maxillofac Implants. 2008 Nov-Dec;23(6):1128-32.

3.Becker S T, Terheyden H, Steinriede A, Behrens E, Springer I, Wiltfang J. Prospective observation of 41 perforations of the schneiderian membrane during sinus floor elevation. Clin Oral Implants Res 2008 DEC;19(12):1285-9.

4.De Rouck T, Eghbali R, Collys K, De Bruyn H, Cosyn J. The gingival biotype revisited: transparency of the periodontal probe through the gingival margin as a method to discriminate thin from thick gingiva. J Clin Periodontol. 2009 May;36(5):428-33.

5. Pommer B, Unger E, Sütö D, Hack N, Watzek G. Mechanical properties of the schneiderian membrane in vitro. Clin Oral Implants Res. 2009 Jun;20(6):633-7.

6. Fu JH, Yeh CY, Chan HL, Tatarakis N, Leong DJ, Wang HL. Tissue Biotype and Its Relation to the Underlying Bone Morphology. J Periodontol. 2010 Apr;81(4):569-74.

7.Kan JY,Morimoto T, Rungcharassaeng K, Roe P, Smith DH. Gingival phenotype assessment in the esthetic zone: visual versus direct measurement. Int J Periodontics Restorative Dent. 2010 Jun;30(3):237-43.

8.Cakur B, Sumbullu M A, Durna D. Relationship among schneiderian membrane, underwood’s septa, and the maxillary sinus inferior border. Clin Implant Dent Relat Res. 2011 Apr 19.

9. Kumar V, Faizuddin M. Effect of smoking on gingival microvasculature: A histological study. J Indian Soc Periodontol. 2011 Oct;15(4):344-8.

10. Janner SF, Caversaccio MD, Dubach P, Sendi P, Buser D, Bornstein MM. Characteristics and dimensions of the schneiderian membrane: a radiographic analysis -using cone beam computed tomography in patients referred for dental implant surgery in the posterior maxilla. Clin Oral Implants Res. 2011 Dec;22(12):1446-53.

11. Yilmaz HG, Tozum TF. Are gingival phenotype, residual ridge height and membrane thickness critical for the perforation of maxillary sinus. J Periodontol. 2012 Apr;83(4):420-5.



CONSENT FORM

I ……………………………………. son/daughter/wife of ……………………………………… aged…………….. resident of …………………………………………………………………. do hereby give consent to use my CBCT data and measure my gingival thickness for research purpose. The procedure has been explained to me in my own language. I agree that no responsibility will be attached to the surgeon or the hospital authorities.

Signature of Patient/Parent:

Signature of Witness:



Place: Signature of Researcher:

Date:
Directory: cdc -> onlinecdc -> uploads
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